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Message: [QUOTE="motometal, post: 1122735, member: 24727"] I realize everyone is just trying to help but we should be able to rule out a few things here. air leak-If it ran better on top with a leaner main, then an air leak is not what is causing flat top end performance. An air leak between the carb and the cylinder, or at the cylinder base gasket would lean the mixture, having somewhat the same effect as leaner jetting although it would probably be most noticeable at lower rpms and idle where there is the most vacuum. An air leak around the boot to the airbox won't make the bike run much different, it will just suck in dirt and hurt the motor. air filter-you would have to really have it overoiled to cause this problem, but just for the heck of it you could re-do the air filter, after cleaning out the existing oil, and right after you oil it (before the oil has a chance to get tacky) take paper towels and blot as much oil as possible from the filter element. This will still leave behind plenty of oil to do the job, and should rule out too much oil on the filter. gearing-this wouldn't make a difference. timing-I can't remember if this is adjustable on that bike, but if it is there should be marks to line up, and that's where you want it. carb-i've become less enthused about the idea of switching carbs to a newer/"better" model/design after having some frustrating, inexplainable experiences with a bike simply not being compatible with a non-stock carb for no rational reason. I suggest if possible putting the stock carb back on as a "dummy check" just to make sure that isn't it. I had a '93 CR250 and thought it had an absolutely awesome motor, personally I can't see a problem with the stock carb and feel changing it out could do more harm (or frustration) than good. reeds-if they are bad usually it won't start well or will run funky on the low end. exhuast-are you sure there couldn't be something obstructing the exhaust? Could something have built a nest in there while it was apart? [/QUOTE]

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