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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 28077
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I had a tecumseh engine which blew up and i changed it with

Customer Question

i had a tecumseh engine which blew up and i changed it with a few alterations for a 12.5 formula engine..... more power? nowv my engine stalls when it comes up to longer grass it just dies is thisv a mixture problem or something more ominous
JA: Can you guesstimate how old the engine is? And has it done anything like this in the past?
Customer: no idea on age and it hasnt really worked well since the change
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: no
Submitted: 11 months ago.
Category: Small Engine
Expert:  Curtis B. replied 11 months ago.

Do you have good fuel flow to the carburetor? Is this gravity flow fuel supply? Did old engine have a fuel pump? The stalling is indication that there is not enough fuel to the cylinder.

Customer: replied 11 months ago.
no it was gravity fed as is this one......runs perfectly on idle
Customer: replied 11 months ago.
as the engine gets slightly strained it dies
Expert:  Curtis B. replied 11 months ago.

Remove fuel hose at the carburetor and check for 1/4 cup of flow in 15 seconds.

Customer: replied 11 months ago.
there is good flow bowl fills upwhen i press the float
Expert:  Curtis B. replied 11 months ago.

Is the governor opening up when it hits load?

Customer: replied 11 months ago.
Customer: replied 11 months ago.
how would i know
Expert:  Curtis B. replied 11 months ago.

The governor has to move the throttle linkage at the carburetor , and when you hit load, the governor should move throttle to wide open position , so it will develop horsepower.

Customer: replied 11 months ago.
that happens but engine just dies
its a manual throttle
Expert:  Curtis B. replied 11 months ago.

-Governor may not be working, or again, fule supply is restricted to the cylinder. There is no other reason engine would just die, unless you have a fuel solenoid in the carburetor.??

Customer: replied 11 months ago.
i havent taken carburettor apart just bowl and choke makes no difference full choke or no choke runs the same hence why i asked about mixture
Expert:  Curtis B. replied 11 months ago.

I doubt that the carburetor has any adjustment other than idle screw.

Customer: replied 11 months ago.
Expert:  Curtis B. replied 11 months ago.

The main jet determines how much fuel enters the engine, and with choke making no difference, I question the fuel to the carburetor bowl.

Customer: replied 11 months ago.
taken bowl apart again am going to take out float and see whats what
Expert:  Curtis B. replied 11 months ago.

Float and needle valve only control fuel into the bowl, the center post in the carburetor is the main jet, and the bowl bolt that screws into it. Be sure the needle valve passage is not restricted from a piece of old fuel hose. Remove needle and fuel inlet hose and blow back from needle to outlet.

Customer: replied 11 months ago.
started her up and she stalls the minute i engagev the grass collector brush
Expert:  Curtis B. replied 11 months ago.

Hold throttle and when you turn on brush, move throttle to wide open position. If it stalls, it is not getting fuel.

Customer: replied 11 months ago.
stalls when i give it all but sounds like too much air
Customer: replied 11 months ago.
or not enough ????? stumped
Expert:  Curtis B. replied 11 months ago.

No leak at the carburetor mounting, all tight with good gaskets?