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Message: <blockquote data-quote="Irish John" data-source="post: 115866">My Huang Shen & Grubee frame mounted motor runs OK for many miles then suddenly it starts to drive like the chain sprocket is slipping.  I though it was a broken key on a shaft but both keys are fine.  I think it might be the centrifugal clutch although it feels like the drive sprocket shaft.  I wonder could the engager be causing problems.  I can't see how although it feels like its the engager.  I've looked at the engager and it seems fine.  I've looked at the clutch and it too seems fine.  I don't think its fuel or carby.  I have a filter but maybe it is the carby.  There's no water in the fuel. The line has air bubbles but should that matter?Anyone had experience of this.  It feels very horrible when it happens - it feels exactly like there are a few teeth missing on the sprocket but they are all fine. gears fine too.Any help gratefully received.</blockquote>

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