Join Date: Jun 2002
Location: The Deep South of Vermont
Re: speedometer not working
Okay, if it isn't the wiring breakage problem, here's another known problem.
The sending ring in the final drive can become loose from it seat.
How to check: remove the speedo sensor from the final drive housing. To remove the sensor, remove the retaining fastener and then gently lever the sensor up out of the housing. Careful, it is possible to break the sensor.
Once the sensor is removed, with the bike on the center stand and the transmission in neutral, rotate the rear wheel by hand. Look into the speedo sensor hole with a good light, you should see the sending ring rotating past the hole. Now stop rotating the wheel, and with a small tool try and spin the sending ring with the tool. You are trying to establish if the sending ring is secure or loose.
If loose, it is a rare occurrence. The cause of a loose speedo sending ring is a "creeping" input pinion needle bearing race having worn it way into interfering with the speedo sending ring and knocking it loose.
Again, I only remember this problem being reported once, so it is uncommon. Usually a creeping input pinion needle bearing race is discovered for reasons other than the speedo sending ring coming loose.
Addendum: I think that if the speedometer is intermittent due to wiring breakage or loose sending ring, the cruise control won't work properly since cruise control circuit depends on input from speedo sensor. If you are sure the cruise control is working properly under all circumstances, it would seem that your speedo problem is with the speedometer itself and not with the input signal.
Last edited by CharlieVT; Oct 11th, 2012 at 5:32 pm.