90 3pg Backfiring, new guy

[lakedrum03@yahoo.com]

Yo,

Just joined the golf cart world with a 1990 2 stroke. It was shutting down after getting hot, so I replaced the ignition system with the HEI set up, which I found on this great site.

It ran for all of about 10 minutes, then it started backfiring to the point that it blew up the muffler. Now, I can't get it to start at all, but it is still backfiring badly. I am absolutely stumped. Any help would be great.

Thanks,

Seth

[steelpenguin79]

Originally Posted by lakedrum03@yahoo.com

Yo,

Just joined the golf cart world with a 1990 2 stroke. It was shutting down after getting hot, so I replaced the ignition system with the HEI set up, which I found on this great site.

It ran for all of about 10 minutes, then it started backfiring to the point that it blew up the muffler. Now, I can't get it to start at all, but it is still backfiring badly. I am absolutely stumped. Any help would be great.

Thanks,

Seth

I doubt you blew the muffler up. I'm 100% sure it was one of the two crank seals. change both while you're at it and Tune down the throttle on the carb. If you don't it will continue to load up the engine and BANG goes a crank seal.

[lakedrum03@yahoo.com]

I wish I was kidding.

[steelpenguin79]

Wow! I stand corrected. I still think you have a carb issue that is causing the backfiring. Also I would check the crank seals just to make sure.

[Skoal82]

Is that the correct muffler for your engine?
If it is not you may have a harder time getting your cart tuned right

[lakedrum03@yahoo.com]

Originally Posted by Skoal82

Is that the correct muffler for your engine?
If it is not you may have a harder time getting your cart tuned right

No, I built the exhaust since replacement mufflers for this cart are ridiculously expensive. If anything, this exhaust should lean out the motor due to higher flow and scavenging.

The cart had a new carb on it when I got it. Do you think it was just never tuned right? Which way does the boass crew need to go to lean it out? In or out?

[Barnsworth]

This is probably unrelated to your problem but I noticed your metal shroud (for lack of knowing what to call it) isn't over the head of your engine. I'm assuming it isn't around the head either. You should have that on so the fan will direct the air it produces around and over top of the head. If it's not there I'm pretty sure it'll run hot and that's not a good thing.

Like I said, just an observation.

[cart around]

To load the muffler like that means you lost spark for a while, and then came back.

Sometimes you have to switch the red, and blue wires from the pulsar to see which way runs best.