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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 13 Oct 2013
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Low Rpm knocking

Hello xt land, I've noticed a knocking on the top end when pulling low rpms in gear, but no knocking when at idle or at over 2000 rpm while under power.Just starting out at a low speed and Rpm, Any thoughts on this? Mike
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Old 14 Oct 2013
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How old and how many K's?
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Old 14 Oct 2013
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1989 43f with 13000 kms, doesn't knock at idle or revving the motor, just when pulling away at low rpms.It doesn't smoke or use oil. Mike
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Old 14 Oct 2013
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Sounds like low octane gas mostly.
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Old 15 Oct 2013
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I'll add some octane boost, thanks. Of course being anal retentive I will do a compression test, adjust valves if needed and then another compression test if valves needed adjustment. thanks Mike
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Old 15 Oct 2013
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Check your counterbalance nut is not loose and the key in the keyway is not worn, or both.

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Old 15 Oct 2013
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You still have those keihins on her? I don't know if a skirt knock would only do it when under load or not. I would also inspect for any sort of loose exhaust or rubbing/hitting somewhere, those have a tendency to make weird knocks that you'd swear are inside the motor. But don't ignore it like some would, if that nut would be loose as Mezo points out, it'll make a mess out of things. Just throwing out other thoughts
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Old 16 Oct 2013
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say hey, thanks for the replies...I've read quite a bit about the counterbalance nut and key way lately, like the doohickey on the KLR. Yes JJ Keihins are there to stay. Kind of a wash though, detuned to alleviate any stumbling. When I get my hard earned tax refund I'll buff up the motor, and get more use of the Keihins. Mike
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Old 16 Oct 2013
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I got an '05 klr $1500 under value because of a failed "doohickey", so a factory defect isn't always bad
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