Maintenance & Technical > KX250 / KX125

98 kx250 issues

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blackkx:
 It cuts out briefly sometimes and i can feather my way out it with the clutch most of the time , i noticed when i go into the berm in the same gear but going faster (engine reving higher) it blasts right through . other times i stop and rev the bike and it will bog a little and rev up run like crap and then just snap out of it and run fine . the plug was a beige to brown colour when i purchased the bike (about 6 months ago) and was running maxima castor927 , but everyone local told me it wasent good for kawasaki powervalve as far as gumming it up ,so i switched to pro-honda hp2 then shortly after i had a carb boot leak but it took me a while to diag that problem so i took the carb apart first and cleaned everything very thouroughly and made sure the jets were free of debris or trash and put it back together however i did fiddle with 2 screws on the side of the carb and dont know if they are in correct adjustment , the one on the side of the float bowl i bottomed out and then backed out 1 1/2 turns . (as told by friend)

But  the one on the side of the carb it self could be out of whack anyway my plugs now look darker kinda black actually but i change them like crazy because they are cheap . this is so frusterating .

blackkx:
  just rode it today for about 5 or 6 laps and it ran great , pulled hard out of all the berms and never let me down , i really dont understand whats going on here .

01KX5WOODSRIDER:
    One more thing to check is gas cap vent. This can cause
intermittent lean running from fuel starvation.

gowen:
Your jetting can have alot to do with the humidity and weather too. I'd still try to give the float level a shot. Read the link I posted and check. It sounds like you are running very rich and that would cause poor wide open throttle in a berm.

Also, try running a semi-smooth line  (not much RPM) and then clutch a wide open throttle (as if coming through a berm) and see if you get a the same bogging.

I don't think the berms have much to do with it, just going from slow to fast and alot of gas is the issue..?

blackkx:
 yea i dont thinks its berms either because it would do it riding in a strait line aswell , now that i think more about it right after i fixed the carb boot i was riding with some friends part of the ride is a limerock road and we started drag racing , me being the only kx of the bunch left em all in the dust until when i revved it high at the end of 5th and it started bogging out then but that was the only time it happen that day so i didnt think much about it till now . i didnt get a chance to ride the bike today , i had no daylight left by the time i got home .

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