Tecumseh 5 hp. 2 stage 4 cycl engine 38052

Alzipski · 10-20-2009, 10:30 AM

Toro 521 snowthrower Tecumseh 5 hp. 2 stage 4 cycl engine model 38052

Problem: starts and runs ok on fast throttle when cold...once it warms up and I try to take choke off, it wants to stall...have to leave in half-choke position to keep it running, but performance is bad...when take choke off, it starts backfiring (flames out muffler)

What I've tried: cleaned carb...new plug...head gasket...carb gaskets...adjusted high speed (1 turn) and idle screw (1.5 turn)...no improvement

Suggestions? Thanks!

**octaneman** · 10-25-2009, 05:28 AM

Hi Alzipski

The engine is running too lean, adjust the air/fuel mixture and it should solve the problem.

mstpops · 11-07-2009, 07:09 PM

hi there alzipski if fuel system is ok and be sure head gasket is not blown & valves are not leaking test by a leak down test or has tight valves , check clearances& adjust firing order could be out , ? or timming is out ?or possibly coil breaking down worth a quick look aye

mstpops

10-20-2009, 10:30 AM	#1 (permalink)
Alzipski Registered User Join Date: Oct 2009 Posts: 1 OS: xp	Tecumseh 5 hp. 2 stage 4 cycl engine 38052 Toro 521 snowthrower Tecumseh 5 hp. 2 stage 4 cycl engine model 38052 Problem: starts and runs ok on fast throttle when cold...once it warms up and I try to take choke off, it wants to stall...have to leave in half-choke position to keep it running, but performance is bad...when take choke off, it starts backfiring (flames out muffler) What I've tried: cleaned carb...new plug...head gasket...carb gaskets...adjusted high speed (1 turn) and idle screw (1.5 turn)...no improvement Suggestions? Thanks!

10-25-2009, 05:28 AM	#2 (permalink)
octaneman Mentor Home Support, Gearhead Automotive Center Join Date: May 2009 Posts: 541 OS: WINXP	Re: Tecumseh 5 hp. 2 stage 4 cycl engine 38052 Hi Alzipski The engine is running too lean, adjust the air/fuel mixture and it should solve the problem.

11-07-2009, 07:09 PM	#3 (permalink)
mstpops Registered User Join Date: Oct 2009 Posts: 18 OS: xp	Re: Tecumseh 5 hp. 2 stage 4 cycl engine 38052 hi there alzipski if fuel system is ok and be sure head gasket is not blown & valves are not leaking test by a leak down test or has tight valves , check clearances& adjust firing order could be out , ? or timming is out ?or possibly coil breaking down worth a quick look aye mstpops