exhaust coming out of carb

pushrod345

i posted earlyer about gas spitting out of my carb but it is much worse it is like the exaust is comeing out the carb, it has a small cone shape air filter on it the only way it will even try to start is to squirt gas in the carb when it fires it blowes the carb it blew off the little air filter it will not run, please help i have never seen a motor do this

BGW

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sho305

Take rocker cover off and see if a pushrod fell out or bent.

Lochlin

What kind of cart? On 2 stokes bad reed valves will do that.

pushrod345

it is a 4 stroke

Gregorio

Sounds like an exhaust valve not opening correctly. The spent combustion gasses remain under pressure in the cylinder until the intake valve opens and it escapes through the carb.

pushrod345

just checked valve lash both valves appear to be working, no bent pushrod, i even loosened the exaust nuts and pulled the mufler back a little, no luck i'm stumped?

Gregorio

Is the valve lash adjusted correctly? An exhaust valve not opening all the way or an intake not closing all the way can also contribute to this symptom. Have you done a compression test?

jacobsond

IMHO you have one of two possible problems with blow out of the carb. Exhaust valve problem or intake valve problem. If things look good under the valve cover then. Compression test and or leak down test. Could be a timing issue also. I'm betting on a burned valve because the lash was tight for to long.

pushrod345

the valve lash is good compression is 120, will do a leak down test next

pushrod345

just did another compression test i was wrong it is 135 with no leack down