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1985 K100RS Charging Problem Tue Feb 11, 2020 6:34 am
Bfgben
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Hi Guys,
Bought a modified K100rs a couple of months ago and when I bought it I had it checked over by a mechanic and he said it was fine. I took it on a long ride and it died. I was pulling off onto a slip road and pulled the clutch and that was it. It would just whir and not start. I found if I left it for over 20 mins it would restart but then the lights on the speedo would dim and it would die again and not start. It all seems to point to a battery issue so I had the battery replaced but on the next ride it would die again any time I pulled in the clutch and the revs dropped. I managed to get it to a garage but on the way there it was bucking and misfiring.
We tested the battery when I got there and it was low but jump-started it and when it was revved the battery did charge but when I was riding it the revs would have been high and it still died. I had bought a Hall sensor after reading posts here but it seems like a charging issue. The spark plugs were pretty black when they were taken out. The only thing I did read was that as the speedo has been changed there might be a resister or a bulb to kick the alternator into charging when idling that might not be there now? There is also another connector on the alternator which the mechanic isn't sure about?
Any help would be great as I just want to ride my bike and at the moment its spent its life in the garage
Bought a modified K100rs a couple of months ago and when I bought it I had it checked over by a mechanic and he said it was fine. I took it on a long ride and it died. I was pulling off onto a slip road and pulled the clutch and that was it. It would just whir and not start. I found if I left it for over 20 mins it would restart but then the lights on the speedo would dim and it would die again and not start. It all seems to point to a battery issue so I had the battery replaced but on the next ride it would die again any time I pulled in the clutch and the revs dropped. I managed to get it to a garage but on the way there it was bucking and misfiring.
We tested the battery when I got there and it was low but jump-started it and when it was revved the battery did charge but when I was riding it the revs would have been high and it still died. I had bought a Hall sensor after reading posts here but it seems like a charging issue. The spark plugs were pretty black when they were taken out. The only thing I did read was that as the speedo has been changed there might be a resister or a bulb to kick the alternator into charging when idling that might not be there now? There is also another connector on the alternator which the mechanic isn't sure about?
Any help would be great as I just want to ride my bike and at the moment its spent its life in the garage
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1985-K100RS