Brinkkl2000
New member
I have read numerous threads on my problem, but no one has ever offered up their solution. Seems that when it is fixed no one reposts.
Anyway I have an 84? Excell III that seems to be only running on one cylinder. Single carb and has been cleaned several times, compression in both cylinders is 110, all of the stator figures are within spec, new plugs (several), and new coil. I get a good strong spark out of the plugs when grounding to the head but when it goes in the cylinder it seems to die. After running it for a little while and pulling out the plugs one will have the nice coffee color I am looking for on the mage side but the other will be white like new and a little wet. Tried swapping the plug wires and running a new ground wire from the head to the frame on that side and that isn't working either.
I don't know what else to look for...
Anyway I have an 84? Excell III that seems to be only running on one cylinder. Single carb and has been cleaned several times, compression in both cylinders is 110, all of the stator figures are within spec, new plugs (several), and new coil. I get a good strong spark out of the plugs when grounding to the head but when it goes in the cylinder it seems to die. After running it for a little while and pulling out the plugs one will have the nice coffee color I am looking for on the mage side but the other will be white like new and a little wet. Tried swapping the plug wires and running a new ground wire from the head to the frame on that side and that isn't working either.
I don't know what else to look for...
did you replace the plug caps when you replaced the coil?
Brinkkl2000
New member
yes, replaced both caps and tested them before i put them in
bad ground maybe?????
bad ground maybe?????
Have you checked the flywheel and pick up coil for rust?
Brinkkl2000
New member
Well, I think I got it. I pulled the ground and cleaned up the contact area and replaced the hardware. Seems to be firing on both, but now the thing barely has enough power to move. Sat on the sled with the throttle pinched and it took about 30 seconds to get the power to move. Blocked up the rear end and the track spins freely and it appears as though the clutches are moving freely and properly. The belt looks like it came over with Columbus though, could that be the culprit??
belt is possible. I tend to use dayco belts on the old air cooled yamahas as they hold up well on those sleds.
Yamaha Nutz
New member
sounds like a crank seal to me