Normal deceleration backfire?

[Guest]

Is it a normal thing for a 1979 GS1000 to backfire (poping) some when decelerating?

[tom203]

Is it a normal thing for a 1979 GS1000 to backfire (poping) some when decelerating?

A little popping.....? How about going up hills?
have you tried 92 octane fuel?

[1978GS750E]

Check for air leaks in the carb intake boots or exhaust system where it bolts to the head.

[TxGSrider]

Is your exhaust stock?

[fastbysuzuki]

Sounds like an exhaust leak.

[Gorminrider]

NOT an expert, not familiar with your bike either but I don't think it's "normal" on most bikes...but mild popping isn't a big deal and it might be better to live with it rather than get into a tuning project.... .

Downhill, coasting, throttle closed, often simply due to lean-ness - above answers above are pointing to this. It can be at the idle-mix screw and it's carb passages, but the same effect can be got with airleaks when the engine is sucking very hard with the throttle closed... a simple fix to try on a 1 or two cylinder bike is just turning the idle mix screws out a 1/4 to 1/2 turn but on a four cylinder, well, it's not so simple. Mark the screw positions before tinkering. If your plugs turn black or other symptoms appear, look elsewhere.

[Guest]

Is your exhaust stock?

Yes, Stock. The bike only has 7,200 miles on it so the ex. pipes have never been off. It runs very good otherwise.