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FJR Motorcycle Forums
Technical & Mechanical Problems
Low mpg and slight power degradation
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<blockquote data-quote="RossKean" data-source="post: 1181974" data-attributes="member: 19880"><p>It seems that everyone is focusing on fuel additives. I think there is little likelihood that a magical chemical elixir is going to fix this issue!</p><p></p><p>80% of the time, a problem can be traced to the most recent item that was fucked with! If, as the mechanic mentioned, the valve check was done with no changes needed I would dismiss timing issues as a root cause. One caveat; if the cam chain tensioner (on an '06) is original, there is a possibility of a skipped tooth due to a faulty unit although I would expect running differences would be more extreme. If the CCT has not been changed, I would do it with the upgraded part and verify the timing afterward.</p><p></p><p>Throttle bodies removed for cleaning? What's the chance that the boots were not installed properly so there is an air leak between the TB and the intake? Certainly worth a closer look. I also agree that its worth verifying that the TBS was done correctly.</p><p></p><p>Other stuff:</p><p></p><p>Bad or marginal injector - maybe just dirty or possibly defective. The magic chemicals MIGHT help but removal, inspection and ultrasonic cleaning is far more likely to yield a good result.</p><p></p><p>Bad spark plug(s) or wires/caps/coils (any worse while riding in wet weather?)</p><p></p><p>Running with a Power Commander? Check the ground and possibly remove it to make sure it isn't the root of the problem. Could be bad or the map may have become messed up.</p><p></p><p>O2 sensor OK?</p><p></p><p>Pressure on the fuel rail up to spec</p><p></p><p>These things can be frustrating to troubleshoot. Good luck!</p></blockquote><p></p>
[QUOTE="RossKean, post: 1181974, member: 19880"] It seems that everyone is focusing on fuel additives. I think there is little likelihood that a magical chemical elixir is going to fix this issue! 80% of the time, a problem can be traced to the most recent item that was fucked with! If, as the mechanic mentioned, the valve check was done with no changes needed I would dismiss timing issues as a root cause. One caveat; if the cam chain tensioner (on an '06) is original, there is a possibility of a skipped tooth due to a faulty unit although I would expect running differences would be more extreme. If the CCT has not been changed, I would do it with the upgraded part and verify the timing afterward. Throttle bodies removed for cleaning? What's the chance that the boots were not installed properly so there is an air leak between the TB and the intake? Certainly worth a closer look. I also agree that its worth verifying that the TBS was done correctly. Other stuff: Bad or marginal injector - maybe just dirty or possibly defective. The magic chemicals MIGHT help but removal, inspection and ultrasonic cleaning is far more likely to yield a good result. Bad spark plug(s) or wires/caps/coils (any worse while riding in wet weather?) Running with a Power Commander? Check the ground and possibly remove it to make sure it isn't the root of the problem. Could be bad or the map may have become messed up. O2 sensor OK? Pressure on the fuel rail up to spec These things can be frustrating to troubleshoot. Good luck! [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Low mpg and slight power degradation
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