HMSK80 R&R CARB STILL BLOWS WHITE SMOKE AFTER FULL THROTTLE

[brianmilw]

OK I have no idea and am stumped. i bought a carb rebuilding kit after cleaning it didn't fix my problem.

the motor is a 1995 tecumseh HMSK80 8 HP SNOWKING ON A MTD 826

AT 1 TURN ON THE IDLE JET
1 1/2 TURNS FROM SEAT ON BOTTOM JET THE ENGINE IS STILL SURGING ON FULL THROTTLE AND ACTING IRRATICALLY.

IT WILL IDLE FOR AWHILE WITH NO SMOKE BUT NO MATTER HOW MANY TIME I WENT A LITTLE LEAN OR RICH OF BOTH JETS I GET A WHITE CLOUD OF SMOKE.

I DID A ....OPPS SORRY ABOUT CAPS.
i did a compression test on the motor and it is @ 140psi

on full throttle when it is surging if i lean it up a little bit i start to get litle back fires and sparks inside of the muffler.
if i richen it up about 1/2 a turn richer than factory starting point the rpm's stabilizes but engine kills when i drop to low idle.

Ive rebuilt and adjusted my carb on my old h70 and had no problems... im stuck. i think it is a govenor problem but watched a video where the guy said the govenor wont cause a surging or flooding rich condition.

when i turns the motor over without the spark plug in the govenor arm is rocking back and forth and i hear a noise coming from the area which could be a normal noise not sure.

someone help me before i cut this thing in half with my rose tip wrench.

 

[brianmilw]

also, I got the hole on the body of the carb by stamp cleaned. all 3 small holes under small welsh plug.on body of carb. blew out everything on carb. all passages.

one more thing, no smoke on full throttle. no smoke on idle, big white poofs when switching from idle to full with black smoke following sometimes.

full to idle engine usually dies and at idle it runs irratic.

new plug had thick carbon black coating and looked rich.

could this be the exhaust valve? I have no idea just poked around for a few idea's. Tech's, engineers and the knowledgeable please help.