imported post
Hi all,
First time on this very useful site and hoping somebody has had the same problem and fixed it.
Just bought '81 Interstate with 76K miles that has a horrible clatter that sounds like a primary chain problem when pulling away from stop. Once moving all is well and quiet all gears except for an occasional cough from what feels like one cylinder. I was thinking the problem may be due to a missfire at low RPM but the jerking noise is so bad I can't tell if it's due to the missfire.
The missfire is also there when idling. Tried pulling plug leads one by one but it then runs so rough it's difficult to tell what's going on.
I've dumped a 3rd of can of Seafoam into intake manifold and changed the plugs. The rest of the can went in the crankcase in case there was a stickly valve causing the missfire.
The bike has only done 2K the last 4 years so I suppose it's possible something is sticking in the carbs. Don't think it's a sync problem because it idles well except for the cough once every 4 to 5 seconds.
Thanks in advance.
Hi all,
First time on this very useful site and hoping somebody has had the same problem and fixed it.
Just bought '81 Interstate with 76K miles that has a horrible clatter that sounds like a primary chain problem when pulling away from stop. Once moving all is well and quiet all gears except for an occasional cough from what feels like one cylinder. I was thinking the problem may be due to a missfire at low RPM but the jerking noise is so bad I can't tell if it's due to the missfire.
The missfire is also there when idling. Tried pulling plug leads one by one but it then runs so rough it's difficult to tell what's going on.
I've dumped a 3rd of can of Seafoam into intake manifold and changed the plugs. The rest of the can went in the crankcase in case there was a stickly valve causing the missfire.
The bike has only done 2K the last 4 years so I suppose it's possible something is sticking in the carbs. Don't think it's a sync problem because it idles well except for the cough once every 4 to 5 seconds.
Thanks in advance.