chrisnbush
Member
Hi -
Love my 80cc center mount, have about 600 miles on it now. Have gotten into the habit of tightening engine bolts, carb bolts, chain, gas tank bolts. And oiling chain, greasing left drive sprocket and bearing in clutch pin, etc.
Has been pretty stable for a month but today, on my 16 mile ride to work, the engine started making a thrashing noise at higher RPMS. First I noted my exhaust was loose (I have a LARGE hose clamp that holds it to the frame, so I tightened it). I don't think it is the power part of the engine, as it sounds fine at low RPM.
When I got to work I went over it. The spark plug it tight, I adjusted the clutch after looking at the clutch pads - seems to be a lot left on them. Could use a little grease on the primary gears, but they look wet, not dry. I checked the head bolts, and tightened the chain. It doesn't look like the clutch is hitting the cover or anything, there are no marks.
Everything LOOKS fine. After my adjustments, I took it out for a ride, and again at higher engine speed I hear a thrashing that wasn't there before. It came on suddenly this morning, by the way.
One stupid thing it might be is the chain guard might be vibrating, but it sounds like it is coming from the clutch area. I am planning to grease the clutch and drive gear this evening, and will put my hand on the chain guard on my way home to see if this quiets it.
Anyone have any suggestions on what I should check ? I am wondering if I have a problem with a bearing on the piston or crankshaft. How hard is it to replace these - is there a thread somewhere ?
Any help would be appreciated
cb
Love my 80cc center mount, have about 600 miles on it now. Have gotten into the habit of tightening engine bolts, carb bolts, chain, gas tank bolts. And oiling chain, greasing left drive sprocket and bearing in clutch pin, etc.
Has been pretty stable for a month but today, on my 16 mile ride to work, the engine started making a thrashing noise at higher RPMS. First I noted my exhaust was loose (I have a LARGE hose clamp that holds it to the frame, so I tightened it). I don't think it is the power part of the engine, as it sounds fine at low RPM.
When I got to work I went over it. The spark plug it tight, I adjusted the clutch after looking at the clutch pads - seems to be a lot left on them. Could use a little grease on the primary gears, but they look wet, not dry. I checked the head bolts, and tightened the chain. It doesn't look like the clutch is hitting the cover or anything, there are no marks.
Everything LOOKS fine. After my adjustments, I took it out for a ride, and again at higher engine speed I hear a thrashing that wasn't there before. It came on suddenly this morning, by the way.
One stupid thing it might be is the chain guard might be vibrating, but it sounds like it is coming from the clutch area. I am planning to grease the clutch and drive gear this evening, and will put my hand on the chain guard on my way home to see if this quiets it.
Anyone have any suggestions on what I should check ? I am wondering if I have a problem with a bearing on the piston or crankshaft. How hard is it to replace these - is there a thread somewhere ?
Any help would be appreciated
cb
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