Popping and backfiring as soon as throttle is touched??

[Beamesy7]

Any ideas? Timing is correct, and carb just had rebuild. Is it still a carb issue? Whats going one? It just starts popping and backfiring horribly as soon and you touch throttle.

 

[YAMAHAULER]

clutch and or parking brake safety switches
unplug them and toss
then where they plugged into the harness under the headlights plug the 2 wires together and you should be golden

 

[Beamesy7]

I have no saftey switches, is it possible I have them bypassed wrong?

 

[YAMAHAULER]

there should be 2 black with yellow stripe wires 1 with a male connector and 1 with a female connector under the headlights plug them together

 

[Beamesy7]

I have them plugged in..... Any other ideas?

 

[YAMAHAULER]

pull the spark plug I bet it's black meaning it's running way too rich that's the only other thing that would cause the issue your having

 

[Beamesy7]

It seems to be running rich, but why is the question I have stock jets with a k&n filter and dg rcm exhuast if anything it should be lean... Idk.

 

[YAMAHAULER]

what notch is the needle clip on?

 

[ag2560]

I just had the same issue with customers quad. No matter what I did to the carb jetting or needle position it was rich. It turned out to be the tube in the carb body that holds the needle jet tube. It`s not a replaceable part if you have access to another carb try it.

 

[Beamesy7]

It was the parking brake switch. she finally runs after a 6 month rebuild!!

 

[YAMAHAULER]

those dirty little switches I tell ya lol
good to hear it's running as it should

 

[WV98YFM350]

yep I thought that sounded like the problem! fancy first gens don't have those and if you switch electrical ALWAYS gotta remember those...