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Message: [QUOTE="iainross, post: 239857, member: 25978"] I have just discovered why my jap import 91 KDX200SR feels very flat compared to my mates new 220, apart from 10 years development and 20 cc of course. The SR aparently has a smaller carb (28mm), different porting and a different head as well as several other changes. Is it worth converting the engine to R spec or should I just sell it to some unsuspecting person and get an R. If it is worth sorting, what is the best way of doing this without spending too much cash. I want to keep the oil injection though as this saves a lot of f***ing about at fill ups. So far I have stripped out the front pipe, fitted a DEP straight thru silencer and chopped the airbox lid. This has helped but there is a way to go yet. I'm in the UK so this will affect parts availability and who I can get to do any work. thanks Iain [/QUOTE]