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Canadian Daves JustKDX
help me diagnose engine problem
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[QUOTE="jaguar, post: 809879, member: 19340"] My bike has a modified CDI and aftermarket ignition coil, PC pipe, wiseco piston, and the two side KIPS valves epoxied in the open position.. The other night I was coming home (on the street) and was winding thru the gears with good crisp power, slowed down and turned a corner and then buah – no power – just blubbering – kind of like when the main jet is too big and you crack the throttle all the way open. Only at idle it runs good, but sometimes even at idle it blubbers. I can’t get it to go more than a few mph now but at first sometimes it would kick in and run good for a few seconds. That on and off symptom indicated electronics to me but I have explored what I believe to be all in that area. (true? help!) 3 months ago I had replaced the crank bearings and seals (with OEM. Can they go bad in 3 months of daily riding on the street? (Only 10 miles at most) Last replacement period was 11 months for the seals. I took the motor apart and verified a good condition for: the top gasket (which is brand new), bottom gasket, piston, rings, reeds, carb (needle in position, no obstructions in main which I replaced anyway, float valve good), air filter, pipe (no obstructions), and noted no drool coming from ignition side crank seal. Then I replaced the following: Spark plug (B9EGV), CDI (std), stator coil (Electrex), ignition coil (OEM). I also cleaned and assured all good connections for the stator coil and measure normal resistance for it. At first I took the ignition cover off and used my timing light to verify the correct timing all through the rev range since I have a modified CDI. It was right on. The bike in neutral would rev clean thru all the rev range. But now it stutters at anything above idle and won't rev higher than 6000 in neutral. I’m really tired but want to fix it now so I can practice tomorrow on the MX track since there is our once a month race in a week. HELP! Through any crazy ideas at me. I’m ready to do/try anything. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
help me diagnose engine problem
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