RCPILOT1956
Joined: 03 Feb 2012
Posts: 3
Location: Moorpark, Ca.
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 Posted: Sun Feb 26, 2012 7:14 am Post subject: 02 450F runs horrible after 3-4 laps |
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Been a lurker, reader, searcher for some time & been able to find the answer to the few problems this bike has presented without starting a new thread. I purchased the bike as the 2nd owner in 04. and until the last year, only took it out 10 to 12 times a year mostly trail & sand dunes, with some track. As my son has gotten into MX racing this last year, I've been going to the track with him and loving it. On a recent track outing after ~3 or 4 laps, the bike started to surge and cut out as if it were starving for fuel. (at least that's what I thought). I figured there must be some muck in there somewhere. Took it home and went through the carb. cleaning the ports and jets with IPA and compressed air. Never did remove the slide. Reassembled, installed new spark plug started the bike and noticed the head pipe starting to turn red hot. found the hot start cable was not seated properly. fixed that and she started up fine. High idle with choke on. No idle with it off. Fuel screw set at 2 turns out. took her for a few laps at my house and had good power no back firing and no cutting out so thought all was fine. Went to the track yesterday and after 4 laps the surging started again. This time I'm thinking electrical. the bike will start but once riding it feels like someone is pushing the kill switch on and off. I'll hold the throttle steady and the bike surges on and off. I tried pulling the choke on during one of these episodes and nothing really changed. the surging continued. I would think if the bike was starving for fuel, pulling the choke on would have changed something in how it ran at least momentarily. Ideas?? Any help would be greatly appreciated.
Thanks
Rick |
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