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FJR Motorcycle Forums
Technical & Mechanical Problems
Hard accel Cam Chain Noise around 2,200 rpm?
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<blockquote data-quote="Fred W" data-source="post: 590570" data-attributes="member: 3828"><p>I don't think this is cam chain noise. I agree with what others have said, that you are lugging the engine. The fact that every FJR you have tested displays this phenomenon also supports this. So, if this really does happen on every FJR, then I can tell you that mine doesn't have cam chain noise under those conditions. But it does make a growling type noise associated with lugging the engine. I'm not sure of the exact origin of the noise, but I believe it is mild pre-ignition.</p><p></p><p>If you understand how the FJR's spring loaded spiral CCT works, there is no reason it would slacken only at low rpm under hard acceleration. If anything, it should slacken at higher rpms when the chain's centrifugal force against the tensioner is greater.</p><p></p><p>[edit] If this only happens when you accelerate hard at 2200 rpm in 2nd or 3rd gear, one sure way to avoid it would be to keep your rpms up higher than that. I generally try to keep mine between 3k-4k for general cruising. It seems happiest up there (or higher)</p><p></p><p>Let us know what you find out...</p></blockquote><p></p>
[QUOTE="Fred W, post: 590570, member: 3828"] I don't think this is cam chain noise. I agree with what others have said, that you are lugging the engine. The fact that every FJR you have tested displays this phenomenon also supports this. So, if this really does happen on every FJR, then I can tell you that mine doesn't have cam chain noise under those conditions. But it does make a growling type noise associated with lugging the engine. I'm not sure of the exact origin of the noise, but I believe it is mild pre-ignition. If you understand how the FJR's spring loaded spiral CCT works, there is no reason it would slacken only at low rpm under hard acceleration. If anything, it should slacken at higher rpms when the chain's centrifugal force against the tensioner is greater. [edit] If this only happens when you accelerate hard at 2200 rpm in 2nd or 3rd gear, one sure way to avoid it would be to keep your rpms up higher than that. I generally try to keep mine between 3k-4k for general cruising. It seems happiest up there (or higher) Let us know what you find out... [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Hard accel Cam Chain Noise around 2,200 rpm?
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