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Bike cutting out, help !

T

tomo

Forum Mentor
On the way to work this morning my 79 GS750 was running well until, sods law, I was on a country road in the middle of nowhere. One minute I was cruising along at 60mph, the next the engine cut out. There was no warning, no rough running or anything like that. Coasted to a stop, and the instrument panel was dead, no ignition light, no indicators. Turned off the key, then turned it on again and the lights came on. The bike started up again, so I set off again. About five minutes later the same thing. Again though after stopping, with dead instuments, it started up again and I made it to work. On the way home tonight I took it easy, expecting it to happen again, but got home no problem.

Any ideas ?. I did wonder whether it could be a loose or frayed wire on the loom, had something similar with a CX500 a few years ago where the loom was worn by the headstock stops, but it looks ok on the GS. I guess its got to be electrical with everything cutting, but what puzzles me is why after turning the ignition off, why everything comes back on again !. Man, I hate electrics !. Any advice much appreciated.
 
tomo said:
On the way to work this morning my 79 GS750 was running well until, sods law, I was on a country road in the middle of nowhere. One minute I was cruising along at 60mph, the next the engine cut out. There was no warning, no rough running or anything like that. Coasted to a stop, and the instrument panel was dead, no ignition light, no indicators. Turned off the key, then turned it on again and the lights came on. The bike started up again, so I set off again. About five minutes later the same thing. Again though after stopping, with dead instuments, it started up again and I made it to work. On the way home tonight I took it easy, expecting it to happen again, but got home no problem.

Any ideas ?. I did wonder whether it could be a loose or frayed wire on the loom, had something similar with a CX500 a few years ago where the loom was worn by the headstock stops, but it looks ok on the GS. I guess its got to be electrical with everything cutting, but what puzzles me is why after turning the ignition off, why everything comes back on again !. Man, I hate electrics !. Any advice much appreciated.
Click to expand...

Sounds like it could possibly be your main power fuse/wire/socket in the fuse block. I would whip out your trusty multimeter and start checking for bad connections around that area. Just my advice :)
 
i had a kill switch with a weakening rocker one that did something like that to me. the cb750k i was riding had just enough vibration at some speeds to trip it. confused us for a good week! :D
 
Ignition switch or main fuse as you also lost the dash lights...get to cleaning and test. Could also be a battery cable, clean them as well and the main ground.
 
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