bike running eratically
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Stage III
Joined: Apr 2010
Posts: 3
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bike running eratically
My 1985 flht developed a miss last year. It did not happen often but you could be going down the road running great and alll of the sudden it would start losing power the tach would be jumping and it would start backfiring. You could let off the throttle and it would smooth out and when you would throttle back up it would start again. After a couple of miles it would smooth out and run smooth. The old bike has 125000 miles on it so I rebuilt the engine this winter. After running it a couple of days it has started being contrary again. I have checked for intake leaks, checked the coil and ignition and I am stumped. Any help would be greatly appreciated because I have a 3000 mile trip coming up soon.
Thanks
Chris
Thanks
Chris
Elite HDF Member
Joined: Mar 2006
Posts: 3,673
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From:
try changing the ignition circuit breaker that's under the speedo. there are 3 under there. i just changed all 3 on my 85. i think they are 15 amp. i ordered them from a napa auto parts store. i changed every ignition component on the 85 and nothing helped. the only thing left was the circuit breaker. that was the problem.
HDF Community Team
Joined: Dec 2005
Posts: 5,404
Likes: 2,605
From: NC USA
It's not common, but I have seen a bad tach on cause them to do that. But in all fairness, sounds more like a bad/corroded connection somewhere. Kill switches can get funky with corrosion and cause that too.
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,199
Likes: 3,087
From: NW AR
Also, the wire between the pickup in the cone and the frame will break inside the insulation. You won't be able to see it. The wire is tied to the frame and the motor moves, so the constant flexing of the wire eventually breaks it. That will give you an intermittant ignition like you describe. I fought that one for years before it finally died completely and I could trace it down.
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