Techumseh 2 stroke starving for fuel - Snowblower Forum : Snow Blower Forums
 
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post #1 of 4 Old 02-22-2020, 01:52 PM Thread Starter
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Techumseh 2 stroke starving for fuel

I am troubleshooting a blower with the diaphragm (no float bowl) style carb.

It will only stay running if I keep priming it. This is from a cold start and the choke is all the way closed - or mid-or wide open.

Obviously seems to me to be starving for gas. I did pull the diaphragm cover and the diaphragm looked really good - no tears or wear.

Do you think this is related to the diaphragm? I do have good gas flow to the carb.

Would the 2 high / low adjustment screws on the side of the carb be set wrong?

Has fresh gas and no filter installed.

Thanks!

Last edited by Waylon; 02-22-2020 at 01:59 PM.
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post #2 of 4 Old 02-22-2020, 02:30 PM
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It could be a pin hole in the diaphragm, they do go bad, or it not flexing right, plus some passageways could be clogged and check your float to make sure that is working properly. Re adjust your mixture screws, turn them in and out to break loose any dirt in them and flush out the passageways to the venturi of the carburetor, it might help.
Hope your crankshaft seals are good and no porosity in the crankcase, if you have any vacuum leaks anywhere, that will effect it causing hard starting and running problems like a lean condition.
Also the little check valves can go bad in them, they sometimes look like little rubber flaps that can be part of the diaphragm or on another gasket depending on the carburetor.
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post #3 of 4 Old 02-22-2020, 03:25 PM
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Sorry for being Capt. Obvious, but make sure that when you turn in the mixture screws that you count the number of turns when it bottoms out, and don't force them it. DonnyBoy has some great videos on adjusting the mixture screws on YouTube.
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post #4 of 4 Old 02-23-2020, 07:23 AM
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Crankseals good?

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