cncpete wrote:
This is cool! I am interested in doing this myself. Please keep us posted on the rebuild process and how it runs.
For non racing application I would definitely not use sealed bearings. Try and find the best bearings you can though.
Has anybody ever thought about or used ceramic bearings?
I have a couple fl250's and am doing a cr250m top end on one right now, but had heard about this before too... might have to start looking for parts!
I have heard the honda bottom end doesn't like the extra power/higher R's
Are you going to rebuild the crank? Weld it? Balance it? What else could be done to make the lower end stronger?
FYI KXT250 84-85 is same top end as well.
-Pete
the bottom end is stock,, works just great we raced them like this with no problems,, with big bore cylinders the stock crank couldnt take the added hp,, this
Engine was putting our about 50hp, only thing you need to do is weld the crank-pin to keep the crank from twisting in the fly-wheels..
the later kx top ends will work as long as it does not have the power-valve exhaust .