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poping thru the exhaust

721 Views 10 Replies 5 Participants Last post by  welsh winger, 
W
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I have a 81 Goldwing Interstate that is poping thru the exhaust. The poping is barely noticeable, but it's there.



Prior to driving my new GW for the first time after buying it, I had the timing belts changed, valves adjusted & the carbs removed & cleaned.Driving it for the first timeafter that I had a problem with the bike all of the sudden slowing down when the throttle lock was on & if you gave it more gas it just bogged down. I then cleaned the gas tank & replaced the gas filter.



Now it runs a lot better & does not slow down under steady throttle. itaccelerates good, but I can hear a shallow popping thru the exhaust at steady speed. Also there is gasoline stains under the right bank of carbs.



Does this sound like a carb problem or something else?



Thanks Don
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exavid
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Yep, it sounds like some kind of carburetor difficulty to me, something there is leaking and that's not doing any good for performance. Best to fix it or up your fire insurance.
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W
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Can you all explain to me how a carb problem can cause popping in the exhaust...please.

Don
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cntryboy1289
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Mine is doing the same thing and I think it is because the carb's need to be synced.
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exavid
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Carb sync shouldn't cause popping, normally the main symptom will be loud knocking on acceleration.
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Hatchetman
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Popping on deceleration would be air cut offs not operating properly. Popping while your throttle is on might be bad detonation caused by fuel/air mixture out of whack but could also be an exhaust valve hanging open just a little. mabey one or more of your valves is adjusted too tight?

What color are your plugs???
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cntryboy1289
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Thanks guys, guess I need to take a look and see what the plugs look like and check the air cutoffs.
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W
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My plugs look like it might be running a little lean & the popping is at steady speed not on deceleration.

Don
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exavid
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If it's not popping on deceleration the air cut offs are working as designed.
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cntryboy1289
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The carb sync took care of the backfiring mine had been doing, so far it has not done it again. Could it have been my carb was burning to rich??
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welsh winger
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Hi carbs out of sync will cause popping in the exhaust, get them balanced, I have seen 2 bikes a 1500 and an 1100 with this problem, also check for exhaust leaks, you may not notice an increase in exhaust noise, but it can cause popping, more so if it is leaking around the joint to the cylinder heads.

Nick
Welsh winger
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