Weird noise coming from go kart..

[Duckie92]

Hello. Haven’t been on here in awhile. I have a baja DN150 with a 150cc motor. My problem (this go kart is just a bunch of problems) is that when i go to start it makez a zapping kind of noise that i have no idea where it would be coming from. Once it does that noise it makes no noise at all when trying to start again. I thought it was the battery so bought a brand new one and still made the noise. Also checked the spark plug and it was all black so cleaned it up and still nothing. This is the fourth spark plug i’ve gone thru and i just bought this spark plug a few months ago. Next i will check the carb but i have no idea what to do afterwards if it still making the weird noise. If i can i will record the noise it makes if it does it again.

 

[the Go Kart noob]

umm its really hard to tell from what you described so could ya make it vid of it

 

[Duckie92]

Yeah i’ll do that when it makes the noise again. Maybe if i disconnect the battery and reconnect it will make the noise again.

 

[B_Bimmer]

Since I enjoy wild guesses based on limited information I am going to go with the coil or wire has a crack and is shorting out somewhere.

 

[MrKnowitall]

Your starter relay or solenoid is about to go south, catch your kart on fire, burn up your garage, and possibly your house if the garage is attached.

Get a new kart.

 

[pRoFiT]

Not sure on noise. But plug should be clean not black. Too much gas. Adjust carb. Not sure what carb is on that 150cc engine. Need pics and model info on engine.

Zapping noise.....got me? Sparkplug, cable, coil, kill switch grounding out somewhere" it connects to spark so possibly causing it to not run.

 

[GrojDad]

If I were to lob a wild guess... It looks like these have a electric choke. It's working on fuel, instead of air. Its un-energized state is 'choke enabled', and its driven by the AC coming from the stator, not 12v from the rectifier.

So if you have a short in this circuit, it would make sense you would hear zapping from the AC. Likewise, you would be running rich, since it would be effectively choking all the time. As far as why it only does it intermittently, not sure.

That's where I'd start poking at it.

http://www.buggydepot.com/product/143/electric-choke-for-gy6-carburetor.html

It could also be this auto choke control resistor. Definitely follow this circuit from stator to wherever this resistor terminates at.

http://www.buggydepot.com/product/194/auto-choke-control-resistor.html

 

[GrojDad]

Actually, now that I think about it, I believe your issue is with the resistor. It would be shunting everything on a cold start (full choke), and then after that the electric choke would energize and 'de-choke'. So maybe bad ground at the resistor, if its grounded? That could also explain why your rich, if the circuit energizing the choke is intermittent due to a flaky ground.

What are your other symptoms you hinted at?

 

[Duckie92]

Thanks for all the info. I will go thru all of what everyone told me. With the problems i’ve had everyone would say it was the carb but i replaced that and even cleaned it out. Well back to the problem i’m having now.. When all this first started i was driving and out of nowhere it just stopped never started again. So i parked it till recently and when i went to start it again was more like alot of clicking then sounded like it wanted to start then went back to clicking then died. Then i tried it again and it seemed like the noise was coming from the starter solinoid so i’m thinking it could be that.