Hello there. A quick introduction to myself: David. I live near Guildford in the south east of England. I joined the forum on June 03, 2016 to search for answers to various problems with my bike.
A quick introduction to my bike: a 1988 K100RS in red. Bought about 7 years ago from a friend who bought it new. He only did 11,000 miles on it in all the time he owned it. I have now got it up to 22,000 miles. So it's barely run in. It did need a bit of recommissioning, but now it's mostly OK.
Here is a summary of the current problem I have been having:
I have been searching this (and other forums
) for a while now because the bike has been suffering from the 'known' speedo problem, on and off, for about three years. I cleaned up the three pins in the speedo head on five occasions, and even went so far as to remove the PCB that they slot into, resolder all the connections and clean the two additional pin connections on the PCB. Still no joy. I also tried a second hand final drive transducer, but lately the speedo needle has only given a vague flick when the bike moves off, then nothing.
So I phoned a motorcycle electrician who had a quick look at the wiring diagram and suggested disconnecting the wire going to the indicator/flasher relay. It is pin 21 on the instrument cluster wiring harness, and it is there so that the indicator self cancelling monitor can do its job. I'm very happy to say that this seems to have fixed the problem. I went on a 15 mile ride on fast, slow, smooth and bumpy roads and the speedo worked faultlessly.
Has anyone else come across this fault? I have not seen it mentioned or suggested in all the posts I have searched.
That's all for now. Enjoy your riding.
David.