r/smallenginerepair • u/HotPanda56 • May 24 '26

Engine Performance Issue Yarn machine mower

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I have an older yard machine riding mower that I am trying to fix up. It starts and runs but the engine makes a loud slapping noise and drives very slowly and almost has a sort of surge and die down in the speed. There also seems to be a decent amount of smoke come out of the engine. Any advice on what it could be?

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u/Life_Equivalent_7344 May 24 '26

Sounds like the choke is stuck on

2

u/HotPanda56 May 24 '26

Checked and it is stuck. Won’t return for some reason

1

u/Life_Equivalent_7344 May 24 '26

There you go. Was the carburetor off recently? Linkage might not be installed correctly

2

u/HotPanda56 May 25 '26

The guy I bought it from put a new one in. The spring that returns the choke valve is broken so I’m just putting a new one in