backfires at intervals of 1000 rpms


Information and questions on GL1100 Goldwings (1980-1983)
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chadbertjac
Posts: 2
Joined: Tue Aug 02, 2011 12:43 pm
Location: Canada
Motorcycle: 1981 gl1100

backfires at intervals of 1000 rpms

Postby chadbertjac » Wed Aug 29, 2012 10:22 am



have a 1981 gold wing Gl1100. bike idles and reves up to 2000 rpms but then backfires, reves smoothly up to 3000 rpms then backfires, reves smoothly up to 4000 then backfires. can anyone tell me what causes this? Had carbs done, timing belt, pick up coils, cdi (both). Thanks!



bustedwing
Posts: 1052
Joined: Wed Nov 30, 2011 4:17 pm
Location: Hermansville, Mich
Motorcycle: 1990 Gold wing Trike
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Re: backfires at intervals of 1000 rpms

Postby bustedwing » Wed Aug 29, 2012 4:42 pm

Does it bacfire thru the intake or exhaust? Does it backfire once then run ok? Is this only cold or warm too? Possible vacuum leaks, old lines cracked?If you can fedl around the rubber hoses whild it's running and listen flr an engine change or a different whistle start that is where your leak is.
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PatrickB
Posts: 6
Joined: Mon Jul 18, 2011 9:33 pm
Motorcycle: 1983 GL1100A Aspencade

Re: backfires at intervals of 1000 rpms

Postby PatrickB » Thu Aug 30, 2012 7:08 am

I would do a compression check.Had backfire when releasing throttle. Found two warped intake valves.Replaced and lapped all others, bike runs great now.

chadbertjac
Posts: 2
Joined: Tue Aug 02, 2011 12:43 pm
Location: Canada
Motorcycle: 1981 gl1100

Re: backfires at intervals of 1000 rpms

Postby chadbertjac » Thu Aug 30, 2012 10:39 am

Thanks guys! had compression test done. all seems to be okay. it idles without backfire and don't backfire til it gets to 2000 rpms, then reves good up to 3000 rpms and then it "pop" "pop" "pops" reves up to 4000 rpms then "pop" "pop" "pop". will check to see if it thru intake or exhaust and if it does it cold or warm . will also check vacuum leak and lines.




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