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SECApocalypse

116K views 939 replies 56 participants last post by  sebwiers 
#1 ·
Was gonna make an awful pun and just put the picture of the battery.

End goal is a low budget cafe-ish bike. I say "cafe-ish" because I'm not giving as damn about any sort of 60's/70's period styling, and rather like the 80's elements on the Seca. I also have long range plans for a Hossack front end, once its running well and basic styling is done, which is so very NOT cafe. Plus, I picked up a CBR600 seat and tail cowling I rather like.
I guess you'd call it a fighter. Or a rat bike. Or just a motorcycle. Bike has plenty of performance for me, I'm looking for a daily rider than can handle rougher streets (potholes, railroad crossings) well when desired. Which actually is pretty much the description of the bike as made; sport touring bike. Any mods I do are just my personal quirks (fork, seat / cowling, electronics relocate), or necessary repairs (new tank / mounting, new fuse setup since the stock Seca fuse block is notoriously crap).



180 cold cranking amps of sealed AGM power, should be all I need to get this machine Goosey hooked me up with running. (Oops, forgot I still need some fuel line too.)



Only way to fit the Virago tank on there was to lift the back end up about 4 inches with a bracket. Is prety much how the stock Seca tank works, actually. But in this case there's a big gap under the tank. And guess what, the battery fits in there PERFECTLY, with room left over for all the hideous electrical crap that was behind the side covers. Stock airbox will stay for now, but I figure if I ever go pods, it'll be empty space from the seatpan to swingarm!

 

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#4 ·
Re: So it starts... XJ750 Seca

i always liked this series of bikes
Its a pretty big, long lived, and diverse series, for sure. There's a lot about this one to like, although many of those same things are also the things people hate. I guess they call that character, if the bike is British instead of Japanese.

I'm pretty sure I'll be keeping the "Atari unit", as I've seen it called on some XJ forums. And the headlights, engine, frame, and wheels. Pretty much everything else is potentially subject to modification. Anything specific you think I should take pains to preserve?
 
#3 ·
Re: So it starts... XJ750 Seca

Had a very enlightening day. As in, I pulled off nearly 50 lbs of metal, plastic, and foam. Also picked up a bit that might add some fun to the project:



Its already looking much better with just the rear peg structure and electrical **** from behind the side covers removed. Not sure about the air box. For now I'm keeping it stock.

Condition of the bike is kinda hairy. Yeah, it runs, but really needs some (not so) tender loving care. Airbox is full of oil, found one of the bolts that clamps the leg in the tripple clamp was only finger tight, fork had 0 air pressure, wiring harness had a big melted / rusted plug pin at one of the large junctures, mud and oil is in every cranny. Looks like a fairly complete strip down / rebuild is justified for more than the cosmetic purpose of doing modifications, so I'm feeling less bad about pulling apart a "working bike".

On the other hand, most of the bolts are super-clean. No wrecked heads, no frozen threads. Its one of the easiest bikes to work on that I've ever owned.

Here's how it sits:

 

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#5 ·
Re: So it starts... XJ750 Seca

Got the stock footpegs and right rearset support off. Looks like the bolts that held the footpegs on are also engine mount bots, and are to damn long to tighten down. Will have to find some new, shorter bolts (in high strength steel). Hopefully I can get them with allen heads, so much easier to deal with.

Pulled off the rear brake and shift lever. My plan is to use the rearset support bolts to mount my new foot pegs, shorten up the brake lever a bit (not much- I have huge feat) and grab a shift lever that can go directly on the shift peg (was link activated). This will result in 1-up-4-down shifting, but I can't see why that would be a problem (unless I burn it in as a habit, and then I'll be stuck riding race bikes- what a problem to have).

Have ALL the electronics (harness, modules, etc) freed up and can actually hook them all up in thier new positions. Didn't need to do any splicing, but there was a lot of pulling plugs apart, freeing up a branch, snaking it through a new route, etc. Main grounding wire is typical - was bolted to back of engine, total PITA to get off, but once I did it was easy to re mount it under the tank, bolted to the coil mounts. If anything, I'll end up with a lot of un-used slack in the wire harness, since I'm pushing the whole system up and forwards.
 
#6 ·
Re: So it starts... XJ750 Seca

Was out in the garage bashing up a template for the battery box build, and got to playing with some parts I had laying about. Goosey gave me an old, rusty, off color seca tank... cafe racers used to build thier rear cowls from tanks... I have a sport bike saddle and tail light....

Here's what I ended up with:


Is a bit longer than actual because the seat and "cowl" can snug together much better once I cut holes in the metal for the seats mounting tabs. Dark line indicates where the top of the frame would run, so that rear metal might get trimmer up a lot. I'd be cutting the whole bottom out of the tank by just removing the entire seam, which will make it look much less "tank like". I dofigure to use the whole thing, and leave the (open) bung, though! Both bits of metal would get fresh black paint and a layer of color-shift (rattle can). Logo would get fresh gold & black brush work (model paint). Seat stays black vinyl, is in great shape.

3q rear view shows why the seat and rear aren't fitting flush; they will be like hand and glove when the tabs slot into the metal.


I absolutely LOVE the way the sportbike tail light fits in the rear of the tank / cowling. The little bit under the brake signal is the bikes stock plate light unit. Will also get some restoration.


The only question is, does this fairing make my ass look fat?
 

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#7 ·
Re: So it starts... XJ750 Seca

I like the idea can't wait to see it CHOP THAT FUCKIN TANK UP
 
#8 ·
Re: So it starts... XJ750 Seca

I like the idea can't wait to see it CHOP THAT FUCKIN TANK UP
Don't have the tools for that just yet. I'm joining community workshop called Hack Factory that has all the tools though. $55 a month, 24 hour access. Beats a gym membership 6 wasy to Sunday, then rapes its ass and sells the porno. However, you can't use all the tools right off the bat. Wood shop, electronics, and basic metal tools are open access, but the welding equipment (plasma cutter, tig wilder, mig welders, torch) require you to take a 2 x 4 hour class first. Already bought my class ticket for December 6.

Did I mention they also have an old school bridgeport mill, lathe, and shaper? Full electronics shop with 3d printer? CNC 5 axis router for wood and plastic? CNC Laser cutter / engraver for wood, plastic, and light metal?

In the mean time, I'm setting up all the work I plan to do. Muffler is already off, next up is to pull the pipes. That gets me better access to clean the engine and pull off those nasty highway pegs. Also lets me repair the dents in the bottoms of the pipes (from jamming it over the lip into my truck bed) and wrap them before re-mounting. Have a pattern for my battery box laid out so I can fab it at my class. Will be bringing the tank to class so I can hit it with the plasma cutter (its so empty there's RUST, so no fire risk).

I went to an open house last week, and there were two other bikes being stored in the space, and was told there's maybe a half dozen guys there who do bike mods. Before I take the bike over there, I plan to build a combination work stand / tool chest / dolly for it. Basically a big chest on wheels, say 2 foot tall by 6 foot long by 2 foot wide, so I can store the bike on top and parts / personal tools underneath. I don;t think theft is an issue I need to worry about, but the place is a bit of a mess, and I don;t want to cause myself / others headaches by having things scatrered about in shared storage areas.

OH, and to keep the pictures rolling, here's something I whiped up because I like the band & song.

I think it will go on the tank side as a "logo", so when people ask what kind of bike it is, I can say its a "Yamaha Stript". I'm leaning away from the color shift, and instead thinking flat primer grey for the frame, and bed liner for the tank and seat fairing. Apocalypse cliche, I know, but I'm a rivet head from WAY back, and its meant to be an 80's bike....

 

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#9 ·
sebwiers - Yamaha XJ750RH - project "Secapocalypse"

Tossing my hat in the ring because hey, I bought a bike from another CF member on and immediately started hacking it. Wife says it's taking ll my time, spreadsheet shows its taking ll my money, might as well make it official.

http://en.wikipedia.org/wiki/Apocalypse said:
An apocalypse (Ancient Greek: ἀποκάλυψις apocálypsis, from ἀπό and καλύπτω meaning 'un-covering'), translated literally from Greek refers to a revelation of something hidden, although this sense did not enter English until the 14th century. .... Today, it is commonly used in reference to any prophetic revelation or so-called End Time scenario, or to the end of the world in general.
The word applies in both senses here, for various reasons.

Start date proof photo - sorry, none taken. I suppose I could start now, but would rather start in "as purchased" form. Bike was putrchased from Goosey on Nov 10. If there's any doubts, the mods can dig into my personal messages to see the transaction being set up.

Here's what the stock bike looked like. With the exception of a 4-1 aftermarket pipe and some front LED turn indicators, that's what it looked like as bought. Problem was, the tank it came with was on Goosey's project bike, and the alternate Seca tank he had was very rusty. Still, it was (appearance wise) pretty much in this condition when I went to pick it up.


Here's the bike's condition on Nov 10, after a few hours work at Gooseys mounting up the Virago tank he'd pulled off his project bike. I did all that work myself, after November 1, so I'm taking credit, good or bad.



Did I say spreadsheet? The purchase price is fluffed and will remain so unless Goosey is OK w/ me sharing that.
 

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#13 ·
Re: sebwiers - "Secapocalypse" discussion

So, I plan on building a Hassock front end for this thing. Gonna throw out some basic parts specs so people can pint out if I'll be killing myself / building a tank.

Basic materials / construction : 11ga (~3mm) steel, tig welded or bronze welded / brazed (as seen in the heavy metal forum here - looks awesome, new to me though). Setup should be highly adjustable (rake, trail, ride height, travel) though may require replacing some bolt-in parts to do so. Setup also designed to be potentially swapped over to another bike (again, replacing some bolt on parts).

Ball joints - automotive units made for Nascar racing. Ball holder slots into 2" tube with a threaded retainer, ball tension is adjustable, etc. Seems plenty strong. Not really aware of other options, I suppose they might be a bit bulky. Bottom unit goes spindle up to position ball as low as possible, top unit could go either way - does it matter?

Control arms - basic A arms. Ball joit at tip, spherical rod ends on arms (parallel for adjustment). 3/4" rod ends seem the largest common size, no reason I can see not to use em even if overkill (I've seen Nascar units for sale with em). Will thread into 1" x 3/16" round DOM tubing, which in turn get welded into 1.25" 11ga square tubing used to build the arm (easier to work with).

Shock - picked up a couple gxr units, will be testing them to determine spring rate and mounting appropriately. Aiming for 6-8" travel (adjustable), adjustable. May try a rocker link setup, since I have the parts (came with shock) and it would let me mount the shock lower (though not sure I want it down by the headers).

Fork - Probably the scariest part to be designing, since if it fails.... splat. But also shouldn't be overly heavy, or handling / ride quality suffers. Would love to build in cad and do stress analysis, but kinda doubt I can teach myself in the time given (even if I did manage to pirate the software).
Considered a lot of shapes and materials, decided girder structure of steel was best combo of cheap, light, strong, stiff, and easy. Same 1.25 11ga square, two legs spreading out from axle to be at least 3" apart (front to back) at ball joint joining. Metal rectangle tube over this at bottom holds aluminum block machined for axle, brake caliper bolts. A thinner third "leg" will go out to the side from there to widen each fork leg (torsion resistance). Triangulated bracing (flat bar stock) spaning between the three creating tetrahedral forms in addition to triangulation between front and back leg. May cut the bracing from flat sheet / wider bar stock to allow nicer shapes / avoid stress risers. Braces 1" x .125", spaced 3" or so appart.
Will probably work on building a wood mock-up first, just to be sure I have my construction details hammered out. Once its built, put it in a jig for some stress testing, measure fork flex to see if its within the range I'm expecting (less than .05" for 1000lbs braking force).

How much does a pair of fork legs with tipples normally weigh? My target fork weight is under 20lbs (which seems kinda heavy, but also safely do-able). On a tele fork this probably corresponds to the weight of the lower legs. Rest of the system (shock, control arms, steering link) will likely be another 20 lbs, but can arguably be considered sprung weight (as much so as a swingarm is).
 
#14 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

Project planning, progress updated as of Dec 4

Phase 1 - Body Work

* new tank - done
* seat mount - TODO
* rear cowling (made from old, rusted tank) - TODO
* detab - DONE
* subframe chop - done
* subframe additions - TODO
* move pegs & controls rear by ~4" - TODO

Phase 1.1 (overlaps all others) - Electrical

* relocate electric system, battery and harness - done
* battery holder - TODO
* Replace rear brake with LED unit from gs600, mounted in custom cowling - TODO
* LED headlights with integrated turn indicators - TODO

Phase 1.2 (overlaps all others) - Maintenance

* Everything required @ 25K miles, minus fork & front brake work (valve adjust, fluid changes, driveline inspect, frame inspect

Phase 2 - Front End (custom designed Hossack system)

* Design fork / linkage geometry (pref 3d w/ FEA) - TODO
* Build fork - TODO
* build control arms - TODO
* modify frame for control arm links - TODO
* bar holder & control linkages - TODO
* mount brakes on fork with solid lines (master cylinder is cable actuated, will ride on fork) - TODO
* Safety test the shit outta that mofo - TODO

Phase 3 - Paint & Deco

* tank & cowling in chrome
* frame in flat grey w/ reflec coating
* clear & reflec coating on fork
* 3d printed logo plates for tank
* laser engraved lexan clutch cover
* restore original logos (gold metalic plastic) on read cowl (old tank) and rear plate light
 
#15 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

Went shopping today, picked up the materials needed to build my rolling work table and various tools and expendables (calipers, grinder & various spin ons).
 
#16 ·
Re: sebwiers - "Secapocalypse" discussion

the best part of this years build is all the non tele fork builds. theres a few of em. good luck on yours. but i think a wood model would take alot of time (or save it?). i bet if you figure out the linkage set up and "fork" beams you could build without a model. are you doing the forks at the hack space, have you joined yet?
 
#18 ·
Re: sebwiers - "Secapocalypse" discussion

the best part of this years build is all the non tele fork builds. theres a few of em.
Well crap, there goes my only really competative advantage. :bawling: Seriously though, who esle is doing one for the buildoff? There's the sweet 2 stroke job is make that thing forkless doing, but I thought that was for an outside contest. Are there others?

I haven't joined Hack Factory yet because I need to meet up with the treasurer to sign papers and get keys. They have open house every Weds night, that's when people are "supposed" to join, so I'll do it next week. My welding class is next weekend, already paid for, so after that I'll be free to use most of the metal shop equipment (still need instruction on mill / lathe).

I'll be doing all my work over there once I join. Getting to cold to work in the garage, its a much nicer space, and I'm dumping a few hundred (partly on a rolling work table to make storage easy, plus membership and classes) to be able to work there, so dammit, I'm gonna spend time there! Seriously, I plan to go over before work and so on (its not to far from the office) - for me, its a gym membership. Just working the mental / skill muscles instead of (or actually, as well as) the body.

We had nice weather this weekend so yesterday I washed the bike up pretty good. Used half a bottle of citrus degreaser and killed two scrub sponges and a brush. Had to lay er down on a pile of empty cardboard boxes to get the mud-oil sludge off bottom of engine and frame. Hope that's just from a clumsy oil change, though I'm pretty sure the valve cover gasket leaks. Did some shopping to pick up grinding wheels and other consumables / special tools Hack Factory won't have. Spent the morning de-tabbing the frame, doing weld prep (wire brushing paint) on spots where I plan to attach new tabs for seat / bodywork.

Yeah, I could build the fork without a model, but there's some measurements I want to be sure I can get right. Being able to adjust dims with bolt on parts is nice, but I don't want them so far off that it looks odd. There's a very specific geometry I'm shooting for that I don't really know the math for. I can buy a computer program that will do it (not a 3d prog, rahter one specifically for linkage forks that calculates link dims given desired behavior & anchor points, etc) or I can build a model, take a picture, and work it out using diagrams / geometry.

I'll probably to do the model just to have something to look at- I'm sure the final product would be more refined if I work out a model first. I've got most of the details sorted in my head, but things always go differently when you build them for real. (Unless you are Nikola Tesla - dude had solidworks in his skull.)

I'm considering setting up a kickstarter to fund the project, with the higher level funding reward being a "production prototype" derived from the design I end up with, modified to suit the sponsors bike. Having a model to show off would help a LOT with that. Lower level rewards would be copies of 3d prints I end up making, and the lowest the traditional t-shirt with the logos I'm using and some cool exploded diagrams from the seca maintenance book. This shit is getting EXPENSIVE! I figure if I can bring in $1000 or so, I'd be funded, and I can afford to do a fork for $500, easy. So really, I'd just need two top level sponsors; lower levels would be gravy. Not sure of the legal aspects though; I suspect if I build a fork and somebody blames their crash on it, I'd at least have some big lawyer bills defending myself.
 
#17 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

Used the newly aquired grinder to de-tab the frame and prep it for welding. Chopped off the tail end of the subframe. I'm loving my cheap Harbor Frieght grinder so far; light, powerful enough to do the job without being so strong it has a mind of its own. Under $25, amazing. I love cutting metal and making sparks fly!

Pictures also nicely show the effect of my electrical component / harness relocation and fender removal. No battery holder yet, but it will be resting on the frame rails above the carbs, totally covered by the tank. Bars are on upside down right now because they are too narrow to fit over the triple clamp (or instrument pod). Figure I can chop it in the middle and widen it a bit. On the other hand, it probably won't be an issue once I replace the fork. Actually kinda wish I hadn't bought the bars, as I expect I'll end up doing custom bars anyhow, but maybe I'll alter them and use em. Original thinking was to have clubman's to play up the fact that it's cafe inspired, although its really NOT gonna be a cafe bike in any traditional sense. For one thing, it will have a trunk...





 

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#19 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

Kludging something on the cheap is part of this project, but even doing stuff on the cheap is expensive when you are doing something new. The costs on this build are killing me. Its always about double what I expect, and I really don't want to cut corners (at least not out of lack of funding; "rat bike" aesthetics will play a part).

To that end, I'm setting up a kickstarter. The fork I'm planning is a potential budget buster, but its also a potential money maker, because its designed to be easy to copy and adapt to other bikes that have similar frames (which is just about all old Jap bikes).

Here's a preview link for anybody who wants to critique or get in early. The kickstart won't officially go live until 2013, at which point I hope to have one hell of a lot more info up, including a mock-up of the fork in position on the bike, a much better landing photo, a video showing my work setup, etc.

http://www.kickstarter.com/projects/1583504654/1769185989?token=55893581
 
#20 ·
Re: sebwiers - "Secapocalypse" discussion

Your build isnt in the running.

The rules require a dated news paper or atomic clock date in the picture woth the current state of your build.

We cannot judge any work done before said date stamp.

Get a paper and set it on your bike snqp a picture and youll be elligable for voting if you finish.

Good luck with that hossac. Itll be a fresh modification if carried out.
 
#21 ·
Re: sebwiers - "Secapocalypse" discussion

The rules require a dated news paper or atomic clock date in the picture woth the current state of your build.
That seems a bit pedantic, given it is so trivial to establish in this case that I did not even SEE the bike until November 10. I bought it from another forum member on that date, and set up the buy via PM's here.

Strictly sticking to the letter of that rule is pretty silly, given how easy it is to fake an image. You want a jpg with a dated newspaper / timestamp from January 2013? I can do that for yah, but wouldn't because, you know, honor system, not being a dick, and its just for fun.

But, whatever. Fine, newspaper it is, will do tonight (haven't bought a newspaper in like 10 years). Pretty weak entry if a bodged tank mount, parts removal, and de-tabbing makes a difference to the results, eh? Thanks for letting me know sooner, rather than later.
 
#23 ·
Re: sebwiers - "Secapocalypse" discussion

Ya i figured ya shouldnt start the hossac before its "legal"
That might hurt your odds, but ya know rules are rules.
I haven't actually mounted anything in except the tank & harness yet, let alone doing any cosmetics or maintenance. Still PLENTY of work to do before I even tough touch the fork!!

Should the date shot be edited into the first post of the entry thread, or can it just go in sequence, noted as my "official" start date?
 
#24 ·
Re: sebwiers - "Secapocalypse" discussion

As long as there is a dated picture with the current status of the bike/parts in the same picture.

It is pedantic but thats the game. You can edit the first post of just keep it like a timeline. Doesnt matter to me.
 
#25 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

i herd u guz leik pitcures of newzpapaz



And because derp, here's a bicture of a hydraulic rim brake from one of my bicycles.



Actually, its because I rather like the brake arch design; that's the kind of triangulated look my fork will have (in a larger, more complex, 3d form).
 

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#26 ·
Re: sebwiers - "Secapocalypse" discussion

for the most part they just need to see a start date condition to compare with at the end. and if all you have done is remove tabs and tear down some parts, you need to get crackin on that front end because there is some serious builders d-ing major fucking w.
 
#27 ·
Re: sebwiers - "Secapocalypse" discussion

Thanks for the vote of confidence. :fu: (Seriously though, I do think I can design and build the front end in two months once I get in a solid workshop, but probably should allow more than that.)

I've seen what other folks are cooking up, saw it before I signed on. There's some great stuff, for sure. I'll be happy if I'm even a contender, since I'm learning and making it all up as I go along.
 
#28 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

VC day. That is, victory over carborators, as they are removed from the bike. Was a cast iron PITA, because the mthod fro removing them is to pull the airbox back 1/2" (at which point it hits the frame) and pry out the rubber tubes that connect it to the carbs, freeing up space to pull out the carbs themselves.
30 year old "rubber". December in Minnesotta. It was less a matter of "pry" and more a matter of "wrench into a folded mass of semi-felxible polymer that hopefully will return to shape when soaked in warm water".

Ah well, I'm planning to build a custom airbox anyhow. The stock one on the bike is U-G-L-Y. Not doing pods because I don't want to re-jet or loose low end torque. Instead I'm planning something that looks a lot like a turbo plenum...

Godamn swing arm wont come off. There's a 6mm "set bolt" that screws into the "plug" on the left side, and its so freaking tight my allen key got a permanent 1/8 twist in it without it budging.

All this work is in prep for removing the engine from the frame. The shop manager at workspace I joined (got my membership Weds) put a nix on my storing the whole bike there, but is OK with me brining in the frame and other components to work on. Dude's being a real Bitch. Ah well, its work I should have set myself to doing anyhow, and will make for a better end result. I'll probably end up sneaking the whole thing in piece by piece over the next couple months, which I think he knows as well, and is OK with; they just don't want a whole bike showing up and sitting there untouched, taking up space. Hah, as if.
 
#29 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

Everything is off excepting the engine, lower triple clamp, and shaft / finaldrive. Bolts on the swing and tripple are to big / tight for what I have. I'm told the engine will come out without pulling the swingarm, in which case I'm good, can remove those components at the shop.
 
#30 ·
Re: sebwiers - "Secapocalypse" discussion

i dont know how fast your capable of working. you seem to have abundant skills so you'll probably finish. but most build off bikes d.n.f. seeing a minnesotan win would be cool. and you should post more pics
 
#31 ·
Re: sebwiers - "Secapocalypse" discussion

i dont know how fast your capable of working. you seem to have abundant skills so you'll probably finish. but most build off bikes d.n.f. seeing a minnesotan win would be cool. and you should post more pics
If I have the money for parts and material, I'll finish. If I have to skip some steps (custom lights & exhaust, detail paint, mounting gauges) to have a ridable entry in time, I will. I've looked at the DNF lists from past years and know getting done is half the contest, and having a bike you can ride is what really makes you feel like a winner.

Bikes going into the metal shop soon, progress (and pics) will be much faster coming after that. I took a week off to line up the workspace, and have been stripping the frame, so pics wouldn't mean much. Might get a picture of motocycle-part shaped bomb debris in the garage, though....
 
#32 ·
Re: sebwiers - Yamaha XJ750RH - project "Secapocalypse"

Was told not enough pics happening. Here's a sketch of what I have planned. Yes folks, you to can draw like this if you go to art school and drop out after 3 semesters. Shocking part is, I'm tracing this on top of a photo. Really, I was just shooting for some fork dims. One of the things this showed me was that my shock will fit (without much rooms to spare) where I had hoped; the top mount will actually sit INSIDE the bottom of the head tube. This is great from en engineering standpoint, because that's the exact point on the bike which is designed to absorb the vertical (and other) loads coming up from the front suspension, so I have no worries over strength. I can do this because hey, I don't need my head tube for steering, unless I happen to want to use it that way. Even so, I can run my new steerer INSIDE the bracket that holds the shock.

 

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