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Old Streetfighter Motorcycle Forum Post 07-19-2017, 12:01 PM   #1
Fight Everything
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Default Doomed to Fail: The SteamRat Build!

It's me again, Margaret!


Aaaaaaaaaaaaaand I'm back with another build. I call it Doomed to Fail: The SteamRat Build. Why Doomed to Fail? If you have to ask, you haven't seen any of my build threads ever....but I'll give you a hint. I haven't finished a single fucking one.

Whats a SteamRat? The premise of the final look is a cross between steampunk and ratbike. Wouldn't that just be some Mad Max outlands, zombie apocolypse type of build, you ask? Nope.


So here's the break down. Been doing a bunch of planning, and I've got a couple parts on hand I've been dying to install on SOMETHING, I've got some ideas I haven't seen done on ANYTHING (seen similar, but close only counts with hand grenades and nukes), and its about goddamn time I do some fucking work...on 2 wheels.

Here's what I'm starting with:

$20 KZ650 frame. No title, bare frame, cut after the shocks, and has races installed for some AllBalls for the steering stem. Had the 5-0 run the numbers for me, it's clean, I'll have no problems getting a title. I should probably do that soon, before I cut this thing in half.



I'm not even using the entire frame. I'm cutting the backbone off, and cutting the bottom tubes right before they bend up. My intent is to build this into a low slung hardtail.

Parts on hand:
Kz650 frame
pair of aircraft control pedals courtesy of Mongo
wide oval low beam projector from an Infiniti QX4
the overwelming urge to put something together

Things I intend to incorporate into this build:
16hp cast iron Briggs & Stratton single cylinder with electric starter and 20amp stator
pair of springer seats
girder front end
kz750 19/16 wheels
Ford Model A taillight with STOP lense and led board

Everything else:
Whatever comes around and seems like a good idea



Already found a front end, or at least part of it. Next pay day I gotta see what I have left, and go make an offer on it. I don't even care that it's incomplete. I can build around it.



I'm also picking up a my motor from MarksA-C. Gonna need a little work to be usable, but that's fine. I like doing work.


Right about now I wish I still had this one exhaust pipe that was always laying around my stash. Tossed it as part of a massive downsize a year and a half ago (relationship issues....). Damn, it would have been perfect for this.

All my previous builds have been based on complete bikes, this will be an almost entirely ground up build.


I've done all the math, and while this won't exactly be a fast bike, it'll have a proposed top speed of almost 90. In no way do I expect it to cruise at that speed. If I can cruise at 70 I'll be happy. I'm building this mostly for around town and county roads.

16hp Briggs, right angle gear box, gokart/golf cart cvt, 18T/46T sprocket set, and 130-90-16 rear tire. The CVT runs a 3:1-1:1 range, so if anyone else wants to run my numbers, I came up with a technical top speed of 88mph based on the 3k rpm limit of your average small engine. Yes, a lot of times we run them higher, I'll be adjusting the governor to give me 3300-3400 at the top. Much higher and you run the risk of destroying the flywheel.

"OMG, an automatic? Why not just buy a moped and feel the wind in your vagina". Hey, I just might. I only live 2 miles from work, I'm sure the breezed will feel great!

Actually my drive train choice is a budgetary thing. I'd love to stick a manual box behind it, but motorcycle transmissions are expensive as fuck. Plus I want the motor facing forward. If anyone comes across a damn cheap transmission, post it, I'm not exactly saying no to the idea. Just the cost.


That's it for now, I'll post more when I start getting parts in!
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