CBR250RR smoking when near redline

[mark247]

Thanks for all the replies! I guess I'll be paying a visit to Murphy & Sons Garage once again! I assume this stuff is easy enough to do myself?

Well to do rings you have to take the head and barrel off, maybe take the engine out? but im not sure. It's really a job for a professional.

[imdying]

Unless you think it'll conk out before the end of your learner period, see post 8. From the descriptions, sounds like it won't.

[buckw65]

Before you start ripping things apart. You might want to try a leak down test. Much better the a compressoin test. It will give you a better idea of what is going on. Also try changing the oil, but use a good high quality oil. It is very hard for the oil control rings to scrap the oil from the cylinder walls at that velocity. Poor quality oils tend to loose their vescocity at extemes.
If the rings are sticking at all, this well cause it too. Oil change might help clean the rings a little and it doesn't cost to much. Another but more serious problem is if the bottom end is getting loose. If the rod end is loose and is throwing to much oil onto the cylinder walls the rings won't be able to control it.