Engine won't stay running

Scrubcadet10

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• May 19, 2019 / Engine won't stay running

• #1

I replaced the Briggs engine on a poulan push mower, with the 799983 Short block,original model # was 122t02-1207-B1.
I can keep it running by manually holding the throttle open then once I let go it dies. I made sure the governor rod was adjusted right (according to a Taryl video) main jet is clear, and carb was working when swapped over.

 

R

Rivets

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• May 19, 2019 / Engine won't stay running

• #2

I’ll bet if you pull the carb you will find that the float level has dropped, causing a lean running condition.

 

cpurvis

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• May 19, 2019 / Engine won't stay running

• #3

Could be a vacuum leak.

 

Scrubcadet10

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• May 19, 2019 / Engine won't stay running

• #4

Float was level as could be...
Cpurvis, never dealt with that kind of problem, what usually causes it...?

Bad or improperly installed gasket. On some engines, a bad o-ring. Anything that seals the intake system between the carburetor and cylinder head, including throttle shaft seals. An engine with a bad leak usually won't idle.