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Discussion Starter · #1 ·
It doesn't start and doesn't even sputter, zero, nothing, nada!

Lawn Flite with TVS105-53107F - Tecumseh 4-Cycle Vertical Engine (about 1990 was running ok last year)

- I cleaned the radiator/heat sink and the exterior of the mower
- I cleaned the carburetor with Methyl Ethyl Ketone (MEK) and multiple runs in my ultrasonic cleaner
- I changed some gaskets (new)
- I cleaned the engine head, top of piston, valves, etc.
- I adjusted the magneto, replaced the spark plug (new) and made sure there's good spark
- I replaced the air filter (new)
- I put in new gas
- I changed the oil
- I replaced the gas line (new)
- I replaced the muffler (new)

All springs, links, etc. seem ok

I even tried the mower with a different carburetor (also freshly cleanned) still no go

I tried it with no air filter

Checked for spark after multiple trials and that's not the problem

What next friendly forum folks???
 

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Is the spark coming at the right time? (Flywheel key)

Will it fire with a little gas or carb cleaner sprayed in the intake?
 

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X2! with Mark!
 

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Discussion Starter · #4 ·
Is the spark coming at the right time? (Flywheel key)

I didn't modify the flywheel timing, is this something that could have changed on its own?


Will it fire with a little gas or carb cleaner sprayed in the intake?

Would I do this by removing the carb and shooting carb cleaner or gas in the pipe intake?
 

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If you hit something with the blade, the flywheel key could be partially sheared, changing the timing.

Just remove the air filter and shoot some carb cleaner down the venture.
 

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Discussion Starter · #6 · (Edited)
If you hit something with the blade, the flywheel key could be partially sheared, changing the timing.

Just remove the air filter and shoot some carb cleaner down the venture.
I replaced the flywheel key (old one was deformed)



I also shot some carb cleaner down the venturi after removing the air filter

Still nothing

I ran a compression test (rope start only)... 30 psi :(



What now... Valve adjustment like in this youtube video?

Link :
 

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You could try that. If the valves are out of spec, you'll have to grind them because they're non-adjustable. :( I'd also inspect the cylinder bore for damage. I don't know if your engine has a compression release. If it doesn't, you're definitely losing compression somewhere, either through the valves or past the rings.
 

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What did the inside of combustion chamber look like before you cleaned it, and the piston top, etc..If it was running alright last year...and now has only 30 psi comp....You may want to remove the head again...and look it over...something must have gone wrong when cleaning...or head gasket not sealing..?
 
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