1990 Yamaha XJ600 refuses to start and only fires a couple of times in really cold weather. Bike starts and runs fine when temperature rises. The Battery is new and fully charged. Engine cranks but wont start.
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This could be leaking fuel injectors, a stuck Fuel Pump relay, and/or faulty fuel pressure regulator. Have you had any of these items checked and/or replaced? If not, it may be time to replace them. Also, check your fuel filter. If it hasn't been replaced in the last year, replace it.
Its a 4 stroke trail bike. They never like to start when its cold. Just make sure the plug is good and make sure the choke is actually working. Other than that, kick it until you get mad, then kick it some more and it will eventually start.
Try changing your spark plugs, this should get you started but also drain out old fuel a put fresh fuel in, use a fuel system cleaner like redex etc in a couple of tanks of fuel.
sound like your starter gear might be missing a tooth or some other king of damage, this shouldnt be a costly repair, but I wouldnt ride too much as it is, if there is a chunk of the starter gear in the transmission, this could cause much damage and be very costly
The cold weather wreaks havoc on everything. I am thinking that the cold weather and your octane rating are not getting along, hence no error codes. Have you tried fuel drier and or octane booster?Since the truck starts when the temperature gets warmer, I would look at octane as the culprit. Try some octane booster and see if that helps. Let me know. Hope this helps.
Thanks;
Rich
RPM Northwest
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