Vintage Dirt Bike Q & A

Hi, I'm new here. I've been looking for a forum like this for a long time! Way cool.

I am building a "frankenstien" bike. I have a 1971 TC90 Suzuki complete without engine that I got for free, someone had put it out with the garbage.
One of my friends had a 1978 IT175 Yamaha that the frame was rusted out and the bike was just a general wreck, but the engine ran great. I gave him $30 for the engine and wireing harness.

The Yamaha engine fits amazingly well in the little Suzuki frame. I have a few problems to overcome, mainly with the exaust, but nothing a little cutting, welding and tinkering won't fix. This thing should be pretty fun I hope. I have been told that the rear wheel may not hold up to the power the engine will put out. What are you guys opinions on that? Any other general thoughts or opinions on this engine swap?

I am looking for a complete caburetor for the IT175 engine, or all the internal parts such as floats, needle, jets and things of that nature. Does anyone have these parts?

Here are a couple of pics:





Thanks.

Very Scary !!! Shorter wheelbase, rotten suspension, flex-i-flyer frame,more horsepower, all = recipe for disaster. What happened to the IT chassis! No never mind!
OriginalDirt

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74 AMPI CZ125
73 CZ400
73 CZ250 Basket case.
72 SherpaT 350
75 Montesa King Scorpion
72 Rickman 125 Enduro
70 Honda CL70
72 Honda Z50
00 DRZ400E Baja'd

The original IT chassis was shot. The frame was practically rusted in half. But thanks for the opinions. This bike definately won't be for the faint of heart. Thanks again. I welcome all opinions, good or bad.

Still looking for a carburetor for this engine.

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My bikes:
1971 Honda SL125
1971 Suzuki TC90 with a IT175 Yamaha engine
1971 Honda Trail 70

Reinforce the frame at stree points. Gusset the swingarm. Stiffer springs in th forks and shocks, or replace with stiffer units. Those things will make all the difference. While you've got the cutting torch and welder out you might as well lay those shocks down and give it some rear travel.