tecuhumseh 3.5 lawn mower starting and runing problem

speedy123

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Jun 8, 2019
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  • / tecuhumseh 3.5 lawn mower starting and runing problem
Hi

I have a techumseh 3.5 hp lawn mower model Lev 90
the mower has a hard time starting
when the engine start it runs
then the motor runs slower and slower and slower
until the engine stops working
then the mower has a hard time to start again

thank you
 

Tommy123

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Jan 26, 2018
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  • / tecuhumseh 3.5 lawn mower starting and runing problem
I have a 3.8 Tecumseh tvs90 on a leaf vacuum
Been tinker with it, but no professional mechanics kust a 70 year old passing time

Any way what i think your problem sounds like is a fuel related problem/issue. Would also check sparkspark plug.
Has the fuel in gas tank been stored for a long time
or has a varnish smell.
Gas cap sometimes will not vent properly. When you crank the engine loosen the cap slightly and see if this improves performance, see if vent at top of cap is clogged. Clean it or just buy a new cap.
Next check fuel hoses and see if they are kinked , hard ,which could restrict fuel flow
Chech fuel filter if one is installed on your engine and see it it is dirty and replace
Same with air filter.
Carburetor might need rebuilding. You tube has plenty of videos on rebuilding carbs.

Maybe others will chime in and correct my advice or offer additional info.
One final thing, see if you can remove the carburetor bowl. Inside of the bowl can tell you a lot about conditions of the carb.
Good luck!
 
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