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2005 RM-Z 250 Problems.... HELP PLZ!!!!

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Hi i bought a 2005 Rm-z 250 last July, it ran average, its my first 4 stroke so i didnt know what to look for. After a while it just quit starting and had low compression,I figued valves and top end. I had all new valves, springs shims and the seats cut along with a whole new top end put in. however it still does the same thing. Doesnt wanna start hardly ever. So i cleaned the carb and messed with the float adjustment with no success.

Any sugestions??? Ive had it for almost a year and just wanna stop dumping money into it and race!

Thanks

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I'm not sure about this, but these 4-strokes may measure low compression as there is a compression relief mechanism to make it easier to kick over. So your low compression may be normal.

In that case, I'd start with ignition. Make sure you have a spark and it's being delivered at the right time. Sheared flywheel keys can cause the timing issue.

If the ignition is OK, then go through the fuel system again.

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