I am running a TW226 6-speed with a 6-plate clutch. The engine started out as a 2000 TTR225 that was bored out from 223cc to 226cc and fitted with a high compression Wiseco piston. A modified TW output shaft was fitted to allow the use of the TTR six speed transmission. I am using using the TW left side engine cover/flywheel/stator and CDI. I am also using the TW right side cover which was modified to fit the larger clutch pack. Carburetion is the stock TW carb.
Power and acceleration is noticeably improved and engine pulls strongly through all gears including sixth gear. The thing that I like the most is the clutch which engages much more gradually and positively than the stocker. Engine starts easily and warms up quickly. I have experienced no problems and never bother checking my mpg. This engine makes me smile every time I take it out.
This was my first complete small engine teardown and rebuild and I was a little apprehensive about whether I could do it successfully. It is really a pretty simple job. Just take your time, label and organize parts as they come apart, take good notes and lots of pictures. It can only go back together one way. A special shoutout goes to Vagabond for his guidance, assistance and encouragement - thanks Roy!