‘77 backfiring
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Cruiser
Joined: Mar 2008
Posts: 187
Likes: 9
‘77 backfiring
I’m still sorting out my newly purchased ‘77 fxe . Today, I took it out for the first real ride. The first hour was fine. Then, the engine began to backfire whenever I turned the throttle quickly. When nursing the bike along with a steady throttle at low rpms, it ran OK but, under load the backfiring got worse and worse. There was no backfiring when letting off of the throttle , only when accelerating.
I removed the carb , cleaned it out ( it looked pretty clean inside) and reinstalled it. This did nothing to improve the problem. I am now questioning if it could be the coil . Is there a way of testing out the coil? Also, any other ideas about what could be causing this.
I removed the carb , cleaned it out ( it looked pretty clean inside) and reinstalled it. This did nothing to improve the problem. I am now questioning if it could be the coil . Is there a way of testing out the coil? Also, any other ideas about what could be causing this.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,590
Likes: 3,361
From: Cental, MI
If yer runnin points ... replace the condenser with a Known good one [note I did Not say New] Seen it many a time.. it will get to where it won't pick up RPM at all if it is the condenser..
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Cruiser
Joined: Mar 2008
Posts: 187
Likes: 9
Yes, this has a points ignition. I will check them closely and install another condenser tomorrow . The plugs were new Autolites. When I checked them after getting home, they were wet with fuel--obviously not firing correctly.
Thanks for the tips . I'll give you updates as I continue to try to fix this
Thanks for the tips . I'll give you updates as I continue to try to fix this
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,590
Likes: 3,361
From: Cental, MI
Yes, this has a points ignition. I will check them closely and install another condenser tomorrow . The plugs were new Autolites. When I checked them after getting home, they were wet with fuel--obviously not firing correctly.
Thanks for the tips . I'll give you updates as I continue to try to fix this
Thanks for the tips . I'll give you updates as I continue to try to fix this
Thread Starter
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Cruiser
Joined: Mar 2008
Posts: 187
Likes: 9
Bingo—- it turned out to be the condenser. The one that went bad was purchased brand new about 3 weeks ago and has about 75 miles on it. I plugged in an old one that I’ve had kicking around and all symptoms disappeared. To reality test it, I reinstalled the bad one again and, sure enough, all symptoms returned. Thanks so much for the advice. I didn’t consider the condenser because it was new.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,590
Likes: 3,361
From: Cental, MI
Bingo—- it turned out to be the condenser. The one that went bad was purchased brand new about 3 weeks ago and has about 75 miles on it. I plugged in an old one that I’ve had kicking around and all symptoms disappeared. To reality test it, I reinstalled the bad one again and, sure enough, all symptoms returned. Thanks so much for the advice. I didn’t consider the condenser because it was new.
Yer already right there!!
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