Tweet
I started my 1979 XS1100SF yesterday after I washed it.
It started normally, ran on the enrichers normally, then idled down normally after it warmed up.
When I put it into into gear, there was a bigger-than-normal clunk and the engine abruptly died.
I found if I gave it some throttle, I could get it to run in gear with the clutch pulled in, but when the idle was in the 1000-1200 RPM range, there was a mechanical ka-dunk, ka-dunk, ka-dunk sound from the lower part of the engine.
I found I could easily roll the bike around with the clutch lever pulled in and the engine running in gear. Therefore the clutch seems normal, and everything downstream of the clutch seems normal.
I rode the bike gently for about a mile it felt like the bike had less power than normal , but it shifted through the gears normally. Whenever I slowed, the engine wanted to die unless I gave some throttle. It ran normally whenever I put it in neutral.
It seems like part of the transmission is not turning easily when I put the bike in gear with the clutch lever pulled.in.
I have to start thinking what is turning when the bike is in gear vs when it is not in gear? Something between the engine and the clutch?
I did a lot of work on the bike over the winter, including new wheel bearing, new steering bearings, new tires, new shocks, etc. The only thing that might be related is that I adjusted the OEM cam chain tensioner. I guess I can start by re-adjusting the CCT just in case it might be related....but it doesn't seem like it would be.
I read through old threads and found one rare similarity. It has happened that the neutral switch wire can short the ign pick-up coil wires inside the harness. I think that is worth checking. Maybe I can pull the wire off the neutral switch and see how it behaves.
Meanwhile, I need your thoughts.
It started normally, ran on the enrichers normally, then idled down normally after it warmed up.
When I put it into into gear, there was a bigger-than-normal clunk and the engine abruptly died.
I found if I gave it some throttle, I could get it to run in gear with the clutch pulled in, but when the idle was in the 1000-1200 RPM range, there was a mechanical ka-dunk, ka-dunk, ka-dunk sound from the lower part of the engine.
I found I could easily roll the bike around with the clutch lever pulled in and the engine running in gear. Therefore the clutch seems normal, and everything downstream of the clutch seems normal.
I rode the bike gently for about a mile it felt like the bike had less power than normal , but it shifted through the gears normally. Whenever I slowed, the engine wanted to die unless I gave some throttle. It ran normally whenever I put it in neutral.
It seems like part of the transmission is not turning easily when I put the bike in gear with the clutch lever pulled.in.
I have to start thinking what is turning when the bike is in gear vs when it is not in gear? Something between the engine and the clutch?
I did a lot of work on the bike over the winter, including new wheel bearing, new steering bearings, new tires, new shocks, etc. The only thing that might be related is that I adjusted the OEM cam chain tensioner. I guess I can start by re-adjusting the CCT just in case it might be related....but it doesn't seem like it would be.
I read through old threads and found one rare similarity. It has happened that the neutral switch wire can short the ign pick-up coil wires inside the harness. I think that is worth checking. Maybe I can pull the wire off the neutral switch and see how it behaves.
Meanwhile, I need your thoughts.
Comment