kx125412 said:What gearing are you running on your bike?
jason33 said:check the ignition timing . mabe you can advance /or retard it a little
sounds like a timing issue ,not reving high enough
cdi is workin or it wouldnt run
has there been any port work done???
pipe and silencer make a big difference ,what is your pipe specified for?
why go dg?
fmf are great pipes
tracetrimble said:Are you sure the power valve is opening? Really sounds like PV to me.
motometal said: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 you don't have an air leak problem. The air leak would have the same effect, which would have actually have made it run better, not worse. An air leak around the boot to the airbox won't make the bike run different anyway, 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, 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?
Because the 1999 is the exact same carb as the one on the 2000 (38mm PWK Airstriker), the only difference is the needle which has a better profile to start with than the goofy 2000 needle. :nod:drew9184 said:i dont know why you would have got a 1999 carb when the 2000 cr250s came stock with the best carb you can get in my opinion...
Yes, I would be suprised if it was really off, but I'm just trying to help him eliminate some more possibilities. I'm still betting on the exhaust valve... :cool:motometal said:...still though, wouldn't you be really surprised if the stock timing was significantly off?...
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