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jimmystractor

Starting problem with a small engine

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jimmystractor

I figured I would pick the brain of the forum on a non Simp/AC...

I have a Toro Snowblower with a 8 HP Tecumseh. It is about 6 years old. It has always been horribly cold starting...

Last winter, I tried starting it and I could not get it to run. This summer, I tried it again and it started FIRST pull. I couldn't believe it. I have since started it again while it was warm outside and it started no problem.

I changed the oil and put in 5w-30 synthetic hoping maybe I put a heavier oil in and that was the issue. It is down to about 30 degrees here now...went to start it today and I couldn't get it going. 

Why would something run easily in warm weather and not run at all in cold weather?

 

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dhoadley

Could be flooding. I'd carefully lean it out, you can always put it back. I have 3 walk-behinds w/ Tecumsehs and the big 2 (6 & 7 hp) have electric starters. Only way to go.

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PhanDad

When it's warm the gas vaporizes easily.

In the winter, I've had success using a heat lamp on the standard updraft carburetor on the old Briggs SS cast iron engines.  Much easier starting with the carb warm. 

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quantico

Try putting a 150 watt spotlight a few inches from it for 40 minutes and see if the heat makes it start easier. If it does I would lean the mixture some. It’s odd that with full choke if does not try to start even when cold. Is the choke effectively limiting air ??  If you give it a small shot of either how does it go ??

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Bear

I have been working on these kinds of machines for 20+ years....I know what's wrong.  Open up the main jet on the bottom of the carb.  Between a 1/4 and 1/2 more.  It's not getting enough fuel when it is cold.

Edited by Bear

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jimmystractor
1 minute ago, Bear said:

I have been working on these kinds of machines for 20+ years....I know what's wrong.  Open up the main jet on the bottom of the carb.  Between a 1/4 and 1/2 a turn.  It's not getting enough fuel when it is cold.

It starts with ether in the cold...I'll try adjusting the carb.

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Kenh

Gasoline formulas change for winter and summer.  Make sure the gas you have in the tank is purchased after September 15 or so.  That is when the switch is made.  The cold winter air is more dense so you need to OPEN the mixture needle a bit more to get the same air/fuel ratio as compared to running the engine in the summer.

 

Hope this helps.

 

Ken

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