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BLACK BELT
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6,913 Posts
Discussion Starter #62
I like trials-style bikes, but don't like standing up all the time . Usually when I sit on a trials bike, my knees are in my chest because the seat is so low.

This is an extremely cool bike!! Never seen rainbow anodizing on fork tubes. That is some hot shit right there. I'll have to look into that.



I like the look of (gold) titanium nitride coated fork tubes, but I've heard that even though the coating is super-thin - it can still cause fork stiction or binding. Maybe that's only if there is a defect in the coating, I don't know and don't want to chance it.

I think the rainbow effect is just the metal itself, without a top coat. If that's right, I might like to try it.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #63
This is a pretty cool design, but I'm guessing it was done by a female.

There is absolutely no padding whatsoever for your balls.

I wouldn't even get on this bike without a cup. :run:

 

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GURU
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8,827 Posts
the bike was designed as a flat land style(ala bmx) bike. No sitting really.

those pics are both concepts. the actual bike has a seat and uses the aircooled ttr250 motor.






I dont think its available in the us. I just put it up there because it "looks" fairly stripped down but is still street legal and factory which is cool.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #66
those pics are both concepts.

I just put it up there because it "looks" fairly stripped down but is still street legal and factory which is cool.
Yep. Both of those bikes are excellent examples of the direction I want to go with this build. Stripped-down, high-end look, detailed clean finish.


I sent in a list today, to get a price on the Aprilia parts - the frame, subframe, swingarm, linkage, kickstand, rear shock, forks, lower tree, and a few other small items.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #67
It's hard to say what I will do, but here are a couple of possibilities.

With the stock cylinders, the RZ350 engine can be modified to put out over 70HP reliably - and should last for a while, if used on a street bike. The engine could easily match the HP that the Aprilia puts out.

I know the RZ engine is heavier, and won't have the usable torque and all that, but it's not a bad alternative for someone like me that wants a two-stroke.

With aftermarket oversize cylinders, the engine could be taken to 550cc to match the size of the Aprilia engine and could put out up to 100-110HP. It would definitely stop people from asking "Why would you swap out the Aprilia engine?" :D

I'm sure the bike would ride much better with the 350cc engine, though.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #68
Part of that frame is cast and may or may not take kindly to modifications if you need to mod/remove material at the rear where the engine goes. You may have a pile of junk before done.
I'm not a welder, well I'm a beginner welder- but I don't know anything yet. But I didn't know you could weld to cast aluminum.

I checked with one of the best fabricators I know, and he said it's no problem at all. So, I could cut those V-shaped aluminum parts of the frame off entirely, and weld in some new bracing - if it comes to that.

I don't want to spend a lot of money and build a good-looking bad-running bike. I'll make sure the frame is well-braced.
 

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fighter'n the good fight
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1,092 Posts

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Build It Ride It Live It
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10,684 Posts
So what about this option? Since you're already looking at spending, let's say $2000, for a factory Aprilia frame that you'll end up having to cut up and hope make work with the RZ engine. Why not talk to a frame builder and have a one off made that fits the motor a lot better and then you can adjust the geometry and style to suit. It would probably cost you as much and you already have a titled/register neck to use. Either option would be cool and hella props once you pull it off. Just an added option to help you pick your battles ;)
 

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BLACK BELT
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6,913 Posts
Discussion Starter #71
So what about this option? Since you're already looking at spending, let's say $2000, for a factory Aprilia frame that you'll end up having to cut up and hope make work with the RZ engine.
I always appreciate the suggestions you guys come up with. That's why I'm posting on this forum - to get help on my projects (and to give help when I can).

I'll be spending thousands, but the initial price on the frame was $550 USD. I thought it was a fair price because the ad said- "This part is in new condition". If you guys have seen my other build thread, you know I'm a pickey mofo, and I don't want used parts- unless they are in new condition, or if I'm going to refinish them.

The parts I listed above were all used, but supposed to be taken off a zero mile bike. Besides what I listed above, I ordered a front and rear axle, and a couple of axle spacers. The price was over $2,200 USD. I did get a small discount off that price for being a nice guy... and spending A LOT of money. :D

If things go well, these parts will eventually provide me with a cool bike - and another build project to keep me out of trouble for a while.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #72
wile your at it you should get this motor kit.
http://thekneeslider.com/archives/2009/02/06/tss-rs500-2-stroke-twin-update/
http://thekneeslider.com/archives/2008/12/17/two-stroke-shop-sets-pricing-for-kits/
http://www.twostrokeshop.com/TSS.htm
it will probably double (or triple?) the cost of your build but probably do the same in HP
Yes, I'm familiar with their stuff - and I agree, that might be a good way to go.

The only thing is, that engine would be much better suited to my RZ streetfighter bike. I'm pretty sure I can't even use the 70+HP RZ engine to it's potential when riding the motard, so all that extra money for the 550 engine would be wasted.

For all the talk and video from TSS, has anyone seen in person or purchased, a running engine from them - or a big-bore conversion? Maybe I'm just out of the loop, but I've missed it.
 

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Build It Ride It Live It
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10,684 Posts
Well, I stand corrected then. If you're getting the main frame for that cheap and it's new, or damn close enough, Then trying to shoe horn the RZ motor in there seems a little more practical after all...
Practical? When the hell do we build anything practical, LOL.

Anway, Sounds like you have some big decisions to make. And I now see your deleima with the front motor mount. Looks like you moght have to have a couple of tubes welded up in a drop down fasion to meet the engine. Similar to a Spondon GSXR frame. It can still be stress member, it's just gona take some extra large mounts made to accomplish it.

You've got my gears turning with this one bud. Curious to see how this works out.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #74
Are you dead set on using the stock frame? I feel for the long travel rear suspension the swingarm pivot is too far from the counter shaft.

Hope you do it though.
Been checking this out and realized it doesn't matter what frame I use. The countershaft sprocket isn't close to the rear of the engine, like on modern engines.

In the OEM RZ350 frame, the rear of the engine is right next to the swingarm pivot tube , and I'll make sure the engine is close to the SXV pivot tube, as well.

You're right, it's not the best engine to use with a long travel swingarm, but hopefully it won't cause too much chain noise or wear.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #75
I couldn't figure out why the ad for the Aprilia SXV frame said:

Only sold to a legitimate person who honestly needs a frame. This will not not be shipped without a conference with the racing staff.

You will need to demonstrate legitimate proof of need before this transaction is finalized.


So, I looked up the parts fiches, which said that only the '06-'07 SXV frame is available. The price I saw was $1,930.66 USD plus shipping from England. I haven't spoken to anyone to verify the info, though.
 

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BLACK BELT
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6,913 Posts
Discussion Starter #76
I know you guys like monster engines- but it makes sense to build the RZ engine to have about the same HP as the SXV engine, that way the components won't be overstressed.

I was just watching this video to get juiced up for the build:

http://www.youtube.com/watch?v=Lmb2k-qGQ8Y&feature=related

It would be crazy if I could get this 12 liter SXV tank and cover it with carbon fiber. Maybe if the plastic is firm enough? I'll have to find out about that - wouldn't want delamination problems or cracking. The tank shape is so sick! I think it looks better WITHOUT the plastic radiator shrouds attached. :knucks:

The tank would need some work, though. It comes with a fuel pump, but the RZ carbs run on vacuum feed.

I've seen a small carbon fiber cover for the top of the standard tank - not sure if it also fits this oversize tank. If it's not good to wrap this tank, it might be possible to make some carbon side covers for it.

 

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GURU
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8,827 Posts
You can weld to cast but this can present problems. While it can be done im not sure that i would want to do this for a frame(personally). Ive welded cast aluminum before and depending on the casting methods used, you can end up with weak welds. I would like to assume since Aprilia cast these frame sections to be welded to other parts that their process is/was suited for it.

For me the choice would be simple. Id modify the RZ frame to suit the style swing arm and bodywork I wanted. You've ridden a stock rz, you know its a little on the flexy side so it would be a good project to stiffen up while modding. A nice back bone out or large diameter tubing would let you drop an mx tank off anything pre twin spar. Heck you could probably find a pre 97 CR, Pre 04 yz etc and weld parts of that frame to your rz frame. You can pick up 125s for next to nothing pre 2000. If you find a rolling chassis that will give you brakes, a set of hubs to lace some 17s onto. suspension(would need to stiffen up) and bodywork for a few hundred bucks. Not to mention a full set of new plastics and tank would be cheap if you wanted new stuff.

Thats how i would go with the project.
 
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