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FJR Motorcycle Forums
Technical & Mechanical Problems
WTF is this noise?
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<blockquote data-quote="wfooshee" data-source="post: 352842" data-attributes="member: 6354"><p>Haven't pulled any covers to check cam timing, but I would think that bad valve timing would be even worse than this. Under load, the motor seems perfect. Pulls strong, smooth, running at highway speed shows no misfire, exhaust note is clean. Overrun has a bit of popping, and the idle is rough, which I think could be accounted for by a rich injector and the fouled plug.</p><p></p><p>It's possible it's jumped a tooth, which would explain the sudden onset of the behavior, but from a couple of automotive experiences, I don't think the motor's running badly enough to show bad valve timing. One car jumped 2 teeth on a timing belt, and pulled very weakly, would not idle at all. Another car; well, now that I think about it, the other car was ignition timing, not cam timing. It had a distributor drive problem, and advanced the ignition timing almost 30 degrees! Very bad, but irrelevant to this problem.</p><p></p><p>Painman, injector cleaner is in the system now. Rode again after supper to pump some more through, total 80 miles today, and the idle is significantly better now than before, but I still have those little pops when coasting.</p></blockquote><p></p>
[QUOTE="wfooshee, post: 352842, member: 6354"] Haven't pulled any covers to check cam timing, but I would think that bad valve timing would be even worse than this. Under load, the motor seems perfect. Pulls strong, smooth, running at highway speed shows no misfire, exhaust note is clean. Overrun has a bit of popping, and the idle is rough, which I think could be accounted for by a rich injector and the fouled plug. It's possible it's jumped a tooth, which would explain the sudden onset of the behavior, but from a couple of automotive experiences, I don't think the motor's running badly enough to show bad valve timing. One car jumped 2 teeth on a timing belt, and pulled very weakly, would not idle at all. Another car; well, now that I think about it, the other car was ignition timing, not cam timing. It had a distributor drive problem, and advanced the ignition timing almost 30 degrees! Very bad, but irrelevant to this problem. Painman, injector cleaner is in the system now. Rode again after supper to pump some more through, total 80 miles today, and the idle is significantly better now than before, but I still have those little pops when coasting. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
WTF is this noise?
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