Speedometer jumping, and inaccurate

timbolia said

That sound like what I need to do. Been runnin with the speedo diconected, just need to get in and do this this weekend.

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Not sure if you resolved this or not...but I have hasd the same issue on many a ride. The cable was the issue 98% of the time (Unless I didn't address it soon enough...then the head would also need attention :( Replacement cables are pretty cheap. I always replace a suspect one & lube the old (spare) & new one at the same time. Works 98% of the time!