Techumseh 5HP won't start - advice? - Snowblower Forum : Snow Blower Forums
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post #1 of 23 Old 02-27-2020, 05:05 PM Thread Starter
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Techumseh 5HP won't start - advice?

I sold someone a MTD single stage snow blower which has a 5hp Techumseh 2 stroke engine. She said it ran perfectly fine for 2 snow storms and ran out of the gas I had in the tank. She bought gas, mixed in one of the mini oil containers designed to treat one gallon of gas and now it won't start.

I have:
Cleaned the carb
Replaced the carb with a new one
Replaced the spark plug
Verified I have spark
used starting fluid - it does cough a bit more hopeful, but won't fire-up


I searched and found that maybe the shear key was snapped. I am considering this option.
I do need to test the compression tonight too.

Since it's a 2 stroke, there can't be much left since the valves are out of the equation.

I am just stumped that the starting fluid nor the new carb does anything. Even if the gas was mixed wrong it would still fire up on starting fluid, right?


Can any of you fine gentlemen think what I may be missing??
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post #2 of 23 Old 02-27-2020, 05:24 PM
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Sounds like the key.

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post #3 of 23 Old 02-27-2020, 05:29 PM Thread Starter
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So the flywheel key? It was dirty as heck when I got it back and wondered if it's possible they hit something with it and sheared the key.

Would a sheared key show itself in any way with a compression test? Any other tests to rule in favor of a sheared key?
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post #4 of 23 Old 02-27-2020, 06:10 PM
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Put the piston on TDC, see if the flywheel magnet lines up with coil . Key could be sheared, and still spark, but not when it should . A compression test will not show a bad key, as compression does not involve ignition.
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post #5 of 23 Old 02-27-2020, 09:18 PM
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If that key has the least bit of damage replace it.

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post #6 of 23 Old 02-27-2020, 11:22 PM
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pull the muffler and check for scoring, very high likelihood that she ran the wrong mixture, used low quality oil like an outboard tc w2 motor oil made for water cooled, not air cooled engines, or that she ran straight gas in it, realized her mistake and swapped it out for mixed gas
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post #7 of 23 Old 02-28-2020, 01:45 AM
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Something seems odd for sure.. it should have ran for a while even if she used straight gas.. cheap oil etc.
Dump the fuel and start over... Could be e85 in there for all we know... May have been some raunchy fuel in her jug and they just finished filling it back up.. heck may have some kerosene in it.
Dump the fuel as it was running fine until the new owner refilled the tank.
Toss in another new plug... The one in there now has been soaked several times.
Before installing the plug... Give the rope several pulls with the plug out to rid as much of the fuel and oil currently that will be sitting in the bottom of the crankcase now.


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post #8 of 23 Old 02-28-2020, 06:00 AM
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( used starting fluid - it does cough a bit more hopeful, but won't fire-up)

side note on priming a 2 stroke, DON"T use starting fluid, it's much safer to use a oil can with 2 stroke gas and oil mix in it.

starting fluid removes that micro fine oil coating from the cylinder walls and bearings.
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post #9 of 23 Old 02-28-2020, 08:39 AM Thread Starter
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Quote:
Originally Posted by Shovel View Post
Something seems odd for sure.. it should have ran for a while even if she used straight gas.. cheap oil etc.
Dump the fuel and start over... Could be e85 in there for all we know... May have been some raunchy fuel in her jug and they just finished filling it back up..


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That was my thought as well but the fact that it did not attempt to run with starting fluid kinda ruled the gas / oil mix concerns for me. Thanks for the response.
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post #10 of 23 Old 02-28-2020, 08:47 AM
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you put on a new carb? for a heads up i have seen brand new with clogged main jets right out of the box, right from toro, might be worth dropping the bowl and take a look at the jet and tube..
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