backfiring


Information and questions on GL1200 Goldwings (1984-1987)
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bandanna_32062
Posts: 2
Joined: Wed Jul 08, 2015 4:21 pm
Location: mcalpin florida
Motorcycle: 1984 gl1200 aspencade

backfiring

Postby bandanna_32062 » Wed Jul 08, 2015 4:28 pm



Got a 1984 1200 aspencade run fine shut it off now only backfires. Put in new timing belts didn't help. What else could make it backfire?



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deanbw
Posts: 278
Joined: Sun Nov 30, 2014 2:30 am
Location: puyallup,wa.
Motorcycle: 1986 gl1200a aspencade . Honda xl600r, '68 z50, '82z50, '80cx500c, '00 klr250

Re: backfiring

Postby deanbw » Thu Jul 09, 2015 11:36 am

when you shut it off does it then backfire once and that's it or is it dieseling (running backward) for a few seconds.
First make sure idle is correct speed, also how is your mileage, backfire could be too rich, unburned fuel going off in exhaust. I don't think it would be the air check because it would run like crap all the time if it was.
My gut feeling is too rich if runs good otherwise, just a guess, mechanical diagnostics by forum text is still an iffy science.

bandanna_32062
Posts: 2
Joined: Wed Jul 08, 2015 4:21 pm
Location: mcalpin florida
Motorcycle: 1984 gl1200 aspencade

Re: backfiring

Postby bandanna_32062 » Fri Jul 10, 2015 4:26 pm

No shut it off now want start just turns over and then backfires thought timing belts put on new ones same thing new plugs same thing back fires real loud

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deanbw
Posts: 278
Joined: Sun Nov 30, 2014 2:30 am
Location: puyallup,wa.
Motorcycle: 1986 gl1200a aspencade . Honda xl600r, '68 z50, '82z50, '80cx500c, '00 klr250

Re: backfiring

Postby deanbw » Fri Jul 10, 2015 6:23 pm

im sure you have checked but make sure right coil wires are on the front plugs and left coil wires are on rear, i know you said it did it before you took it apart but i had to say it.
maybe a compresion test to make sure you dont have a stuck valve.
still not ruling out carbs, maybe air check is bad after all, if it has hole in it you could be pouring fuel into engine.
have to think about this...

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Thomas Hudson
Posts: 59
Joined: Fri Jul 03, 2015 4:52 pm
Location: Greensboro,NC
Motorcycle: 1986 GL1200A Aspencade
1982 GL500 Silver Wing
1979 CM400A Automatic

Re: backfiring

Postby Thomas Hudson » Sat Jul 11, 2015 6:50 am

Hook up a battery charger and let it charge for a few hours and try again. If you aren't getting enough power it won't start. It'll turn over, backfire, spit, but not fire. I'm going through the wiring on my bike now that does the same thing. Cleaned connectors, removed the stator connector and soldiered the three yellow wires directly, but battery voltage seems to be the biggest concern. I'm running a new AGM battery, but still have found that leaving the charger hooked up until it's idling smooth is the best way to get it going.
Also check your main fuse by the battery on the starter selinoid. Take it out and look for cracks. I've heard this can be an issue as well.




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