Still backfiring!
 

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.

Re: Still backfiring!
 

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.

Re: Still backfiring!
 

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.

Re: Still backfiring!
 

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

Re: Still backfiring!
 

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!

Re: Still backfiring!
 

You think its a mixture issue?

Re: Still backfiring!
 

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

Re: Still backfiring!
 

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

Re: Still backfiring!
 

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

Re: Still backfiring!
 

No problemo....take the 4 valve cover bolts off and remove the valve cover and remove the spark plug. useing a screwdriver into the spark plug hole, turn the engine over (by hand!) by turning the primary clutch till the piston is at "top dead center" or "TDC". Use a 4 thousanths feeler gauge between the top of the valve stem and the rocker arm addjustment bolt head. If there to tight, the valve can't close, if to loose..you could lose a push rod when reving it up. To adjust, if needed, loosen the 10 mm "jam nut" on the adjuster screw, then ever so slightly, turn the adjuster screw (clockwise to tighten) till there is a "slight drag" on the feeler gauge, then tighten the jam nut and check witthe feeler gauge for tightness. You will need to do this several times, because the "tightening of the jam nut will affect the adjustment. Then, it is VERY important that you turn the engine over (back to TDC) and recheck the settings. I myself usually turn the engine over and check about 5 times to make shure the adjustment is correct. Reinstall the spark plug and the valve cover and give it a run. Good luck