1986 yamaha moto 4 200 rebuild

[mrfartsalot]

i have a 1986 yamaha moto 4 200 and was wondering if i could put a 350 or 300 jug and piston on it to bump up the cc?

[Frank Angerano]

The best way to find that out is to look up the part number for the cylinder for each bike and see if the number is the same.  

I looked up the part number for the 200 and 225 and it was the same so it could work. But keep in mind that all sh** rolls downhill when you upsize it’s re-jet for the carburetor, exhaust may be tight with too much back pressure, so you can’t just go with a bigger piston and think your going to be ok.  I would prob go the route of boring the existing cylinder and re-jet the carburetor in accordance with the bore and piston size.  As far as exhaust goes after that it would be a matter of changing the silencer/baffle. 

 

[mrfartsalot]

@Frank Angerano  Thanks for the information