Stumpedchump
XS650 Member
Hi all. It's an 83 xs650 with 13k on it.
I've had an issue with this bike since I got it. When I first bought it, it didn't run. needed a new battery and the stator was fried. Replaced them both and have been riding it since though whenever I come to a stop after it's been warmed up it will often backfire through either carb it seems and sometimes die. I can keep it running by feathering the throttle.
It has weak spark. Doesn't look healthy and won't arc beyond the span of a plug electrode. Also, plugs look carbon fouled after a bit. I've narrowed it down to a poor charging circuit at low rpms.(I think anyways)
What I've done. Replaced the stator and the battery when I first got the bike. Since then, coil ohm tested a little out of spec. replaced, no change. Obviously replaced plugs and wires/caps. I've done the magnetic test against the stator cover. Ign on will pull a wrench against it. Tested the 3 legs of the stator. each one shows around 6 ac volts at 1200 rpm. I believe they're supposed to be between 10-11 ac volts. Ohm test between the three legs, checks out ok exactly where it should be. Ohm tested across the rotor brush surfaces, 5.2ohms. Looks ok. Replaced brushes, no change. Have battery voltage at one brush and ground at the other as it should.
I'm stumped. Any help would be great.
I've had an issue with this bike since I got it. When I first bought it, it didn't run. needed a new battery and the stator was fried. Replaced them both and have been riding it since though whenever I come to a stop after it's been warmed up it will often backfire through either carb it seems and sometimes die. I can keep it running by feathering the throttle.
It has weak spark. Doesn't look healthy and won't arc beyond the span of a plug electrode. Also, plugs look carbon fouled after a bit. I've narrowed it down to a poor charging circuit at low rpms.(I think anyways)
What I've done. Replaced the stator and the battery when I first got the bike. Since then, coil ohm tested a little out of spec. replaced, no change. Obviously replaced plugs and wires/caps. I've done the magnetic test against the stator cover. Ign on will pull a wrench against it. Tested the 3 legs of the stator. each one shows around 6 ac volts at 1200 rpm. I believe they're supposed to be between 10-11 ac volts. Ohm test between the three legs, checks out ok exactly where it should be. Ohm tested across the rotor brush surfaces, 5.2ohms. Looks ok. Replaced brushes, no change. Have battery voltage at one brush and ground at the other as it should.
I'm stumped. Any help would be great.