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Hi y'all,
I can't seem to figure out what is wrong with my '80 xs1100 special. I just rebuilt the engine, so it could be any number of things. Basically the symptoms are that I will warm up the bike, then rev it to about 3 or 4 thousand rpms, and it will stay there...though sometimes it comes down in rpms slowly. I can't even figure out where my idle adjustment is supposed to be because the dang rpms are all over the board... I replaced the throttle cable because it was sticky anyway, but no change. I know it isn't simply the throttle cable binding on something - I've checked that already. It could be the carbs/jets I guess, but I didn't disassemble them at all in the engine rebuild process, so I'm hesitant to get into a carb rebuild/synch/etc until I've ruled everything else out. My suspicion is that it is the vacuum advance or the centrifugal advance, simply because of some other posts I've seen on here. The problem is, I am not sure exactly which is which. I know the cent. advance mechanism is the thing under the left side cover that has those...uh...centrifugal things that fly out when rotating, right? Is the vacuum advance mechanism the "bulb" on the top of the cent advance which has a vacuum tube connecting to the #2 carb?
Could issues with either of these advance mechanisms cause this high rev when I let off the throttle or pull in the clutch?
Finally, and I know this is posted on other posts, but I think I've read two conflicting answers, and I want to double check -
Exactly where does the vacuum tube coming out of the centrifugal advance chamber attach to (is it the #2 carb, or the boot?), and exactly where does the short piece of clear tubing off the #2 boot go to and from?
Oh, one more thing (sorry for this long winded post). When I checked the ignition timing with a strobe light, it was only a hair off at idle, but was way off at the 5,200 (or whatever) rpm measurment you're supposed to check next. Hmm, I might have forgotten to remove the vacuum advance hose while doing this, now that I think of it...
Anyway, thanks much!!!
scott
I can't seem to figure out what is wrong with my '80 xs1100 special. I just rebuilt the engine, so it could be any number of things. Basically the symptoms are that I will warm up the bike, then rev it to about 3 or 4 thousand rpms, and it will stay there...though sometimes it comes down in rpms slowly. I can't even figure out where my idle adjustment is supposed to be because the dang rpms are all over the board... I replaced the throttle cable because it was sticky anyway, but no change. I know it isn't simply the throttle cable binding on something - I've checked that already. It could be the carbs/jets I guess, but I didn't disassemble them at all in the engine rebuild process, so I'm hesitant to get into a carb rebuild/synch/etc until I've ruled everything else out. My suspicion is that it is the vacuum advance or the centrifugal advance, simply because of some other posts I've seen on here. The problem is, I am not sure exactly which is which. I know the cent. advance mechanism is the thing under the left side cover that has those...uh...centrifugal things that fly out when rotating, right? Is the vacuum advance mechanism the "bulb" on the top of the cent advance which has a vacuum tube connecting to the #2 carb?
Could issues with either of these advance mechanisms cause this high rev when I let off the throttle or pull in the clutch?
Finally, and I know this is posted on other posts, but I think I've read two conflicting answers, and I want to double check -
Exactly where does the vacuum tube coming out of the centrifugal advance chamber attach to (is it the #2 carb, or the boot?), and exactly where does the short piece of clear tubing off the #2 boot go to and from?
Oh, one more thing (sorry for this long winded post). When I checked the ignition timing with a strobe light, it was only a hair off at idle, but was way off at the 5,200 (or whatever) rpm measurment you're supposed to check next. Hmm, I might have forgotten to remove the vacuum advance hose while doing this, now that I think of it...
Anyway, thanks much!!!
scott
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