Still backfiring!

[stuff4mason]

Guys,

I know I have beat this issue to death over the last few months, but I still got backfiring issues!

OK, the main problem was, when I moved the main throttle cable directly to the carb (bypass gov), I had the end of the cable too close to the carb. I backed the end of the cable way out (away from carb) and it stopped 98% of the backfire.

But, there is a very steep hill at the campground, heading down to the lake. This seems to be the only place it does it now. As I hit the brake coming down that steep hill (Kinda long hill) (no gas pedal) when I get to the bottom, one BLAM!!!

Let me tell you, people at the beach and on the docks JUMP!! Those who know my cart expect it, but others, not so much!! Heck, it even makes me jump, and I am expecting it!!!

Muffler is sealed. No Leaks. Header pipe has new gasket. Gasket between carb and engine, new. Air box is sealed tight. What else could be causing this? And yes, the butterfly is closed with no touchy the gas pedal.

[G1-G9]

mine did the same thing until i changed my muffler. i dont know why it didnt make any sence i use the same gasket and everything. i had changed the carb with the other two i have and i finaly changed the motor but i used the same muffler on the engine change. but until i changed the muffler it still back fired. no holes or even of any kind.

[the.hogman]

When you are coasting (especially from a higher speed) you load the exhaust with raw gas fumes. The exhaust is hot and ignites these fumes, thus you get a loud "pop" thru the exhaust.

This is very prevalent on lawnmowers that have been running hard and then shut off with no idle period between. Allowing a short idle period helps theis problem on the mowers.

Now what to do in this particular golf cart case.....

Hope this helps.

[DOOmsman]

You can changing the air mixture screw a 1/4 turn at a time both in and out.

[stuff4mason]

Originally Posted by DOOmsman

You can changing the air mixture screw a 1/4 turn at a time both in and out.

You think its a mixture issue?

[smallblock450sl]

Just a thought, Have you adjusted your valves? (4 thousanths on both intake and exhaust, when the engine is cold) Seems you have covered almost everything that could cover the backfireing symptom. Good luck

[OBDave]

Originally Posted by smallblock450sl

Have you adjusted your valves?

I just registered because I wanted to thank all of you for the great information on this forum. About a year ago I bought a street-legal 2005 G22A. Every now and again, after coming to a stop, if you hit the gas just as the engine was about to stop spinning, it would backfire. So yesterday I did a bunch of maintenance, changed the oil, adjusted the valves, regapped the spark plug and this morning I went for a 30m putt-putt around town. The backfire issue seems to have been resolved. Thanks!

[Mike Mac]

Exhaust gasket is usually one time use, they get hard when hot. No good when you attempt to use a second time.

After doin some thinking, I bet you have the throttle hingin just a bit open!

[stuff4mason]

Originally Posted by Mike Mac

Exhaust gasket is usually one time use, they get hard when hot. No good when you attempt to use a second time.

After doin some thinking, I bet you have the throttle hingin just a bit open!

Possibly Mike. But probably not. As I've checked this like 4 times now.

[stuff4mason]

I hate to admit this small, but I have no clue how to do that!