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Message: [QUOTE="griffbones, post: 1100882, member: 72285"] My sons 2005 KX85 has a lean stumble (bog) if the throttle is whacked open really fast while the bike is idling on a stand. Also if my son wacks the throttle wide open real fast from a very low speed like 1 or 2 mph (again from idle speed), the bike goes into a bog, it will not die and will not accelerate, it just stays in a bog until he lets off of the throttle and then rolls into it again. I have been back to my Kawasaki dealer where we recently purchased this left over 2005 model, they tell me all of the KX's will lean stumble if you wack them wide open real fast from an idle, or from an all most stalled speed while riding. They said even the KX250 will do this too! Now we just sold a 2003 KX85 and I don't remember this bike doing this or at least not this bad. The two bikes appear to be identicle other than the Wiseco Pro Lite piston that was in our old 2003 KX. I have tried changing the jetting on the pilot circuit but it does not get rid of this problem. With stock jetting (45 pilot, needle third groove, 140 main, air screw 13/8 - 1 1/2 turns out)(at 800-1000 ft above sea level and 75-85 degree temps) the plug looks pretty good, and this same carb with the same jetting worked good on our old 2003 KX85. If I ride the bike (I weigh 185lbs)and get rolling slowly and then wack the bike wide open it will bring the front wheel up in 1st, and if I keep it in the powerband it will wheelie in 2nd, 3rd and sometimnes 4th gears without even trying, so the bike has plenty of power. Does this lean bog or stumble sound normal to any other KX 85 owners? BTW I have also looked over the reeds (they look fine) I have tried going up one with the pilot jet (did not help) I tried raising the needle one groove(did not help) and in fact the bike over all seems to run best with the stock carb configuration mentioned above. The only thing that will completely get rid of the stumble is if I turn the air screw almost all of the way in, but then this just turns the plug black instantly and the bike runs horible except for the stumble being gone when wacking the throttle wide open real fast from an idle speed. Am I just too picky or is this a real problem? I know my son needs to learn to keep it up on the pipe and not wack it wide open from an almost stalled speed, but he is just 10 years old and just learning for the most part. [/QUOTE]

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