Xb runs for 3 minutes & shuts off

[Ronk]

My son has an xb with a high flow air cleaner & a CPI exhaust - the buggy scream @ can easily spin all tires on asphalt - after 3-5 minutes of running it just shuts off - it restarts but continues to stall - has plenty of gas & spark plug running a nice dry brown - please help !

 

[ImminentFailure]

Does it race before dieing, or does it bog out?

If it races check vapor lock on your gas tank first. Seems like a possible problem given your description. The stock vent hole is junk, there's several threads on the forums about modding it different ways.

Best way to test this, is as it's dieing out just untwist the gas cap, should restore to normal running.

 

[Ronk]

Thanks , it doesn't race before stalling - it just stalls - we are aware of the gas cap holen& always make sure it's clear - when it runs it screams - could it be a bad plug even though it's running dry & light brown?

 

[GTS 666]

Might sound strange but I would check your head bolts to see if there tight and your head gasket it maybe have a small leak which I've had and it seemed to be causing the same probs.

 

[AlvaSpeed]

Most of the time is the fuel tank that gets presurized.

Drill a hole on the gas cap and put a vent hose.

That will solve your problem.

You can use a vent hose from a MX bike gas cap.

 

[Ronk]

Thanks Guys - will give the vent cap venting a try !

 

[DustyR3825]

Most of the time is the fuel tank that gets presurized.Drill a hole on the gas cap and put a vent hose.

That will solve your problem.

You can use a vent hose from a MX bike gas cap.

+1 I had the same issue with my XB when I first got it. I vented the gas cap like AlvaSpeed said above it resolved the issue.

 

[DemonRC]

Sounds exactly like a gas cap vent issue.