Just bought a 1980 yamaha xs850 and it seems to be overheating after only a short amount of time. It then barely turns over and wont start again until the motor cools down. Everything seems normal, I am completely mystified. Any ideas?
Is the bike water or air cooled?
If air cooled then it is possibly either an oil or fuel issue. If water cooled your water pump or thermostat may not be working.
SOURCE: My MT-03 engine shuts down while driving and won't start again.
Checking the colour of the plug may tell you what the general state of tune if like for the bike, but the sudden stops sure sounds like ignition system failing. Fuel delivery still there, although it may well be flooding/overfueling for some reason when the problem occurs. I suppose you have checked the VIN (RM021000000000301 to RM021000000008715) just to be sure that your bike if not one of those affected by the recall. I would be asking the Yamagents to check for the mods/recall to be sure that whatever the solution is has actually been done to yours. The reference to wet weather would be inclining me to follow that up to the max. Sounds too close to the problem to not be it.
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Starter motor bearings or brushes are sticking. Strip and overhaul.
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there is not much difference between those 2 engines. they are the same cc and both are in-line 4 cylinders.
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