Engine shutdown throttle vs gas shut off - Snowblower Forum : Snow Blower Forums
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post #1 of 13 Old 03-21-2019, 12:06 PM Thread Starter
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Engine shutdown throttle vs gas shut off

Hi guys,

Is there a difference between shutting down the engine via the throttle vs the gas shut off? Or theres no difference?

I ask because when I cleaned the carb I disconnected the grounding green wire.
While this is disconnected I am unable to shut down the engine via the throttle.

Thanks
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post #2 of 13 Old 03-21-2019, 12:32 PM
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No not a difference per say it is just running the carb empty of fuel instead of grounding the ignition to stop the engine.
So now about the wire that was left off , if it is in there unprotected with a bare end it can become a problem in its self , as if it touches anything metal it can stop the engine or make it fail to start or cause it to run erratic. Just so you know.
If you left it off unintentionally then you would want to remedy this before it becomes a problem.
If purposely then you would want the end protected with a cap or tape.
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post #3 of 13 Old 03-21-2019, 12:52 PM
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I would want to be able to shut off the engine via the grounding just in case of an emergency
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post #4 of 13 Old 03-21-2019, 01:04 PM Thread Starter
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Thanks guys. I'll take the time to reconnect it for sure.
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post #5 of 13 Old 03-21-2019, 03:06 PM
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My 3 cents, I find lots of small engines surge while running out of fuel, for that reason I do a normal shutdown with the ignition switch, ie key, toggle switch or screwdriver grounding out the plug.

However for storage prep I would let the carb run dry and then drain the rest...
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post #6 of 13 Old 03-22-2019, 05:03 PM
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What's wrong with the engine surging. It's not doing any damage. You surge too when you are out of energy :P
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post #7 of 13 Old 03-22-2019, 05:09 PM
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Quote:
Originally Posted by GoBlowSnow View Post
What's wrong with the engine surging. It's not doing any damage. You surge too when you are out of energy :P
I don't consider it good if its happening on a generator....
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post #8 of 13 Old 03-22-2019, 07:44 PM
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Quote:
Originally Posted by contender View Post
I don't consider it good if its happening on a generator....
You're correct there, a generator needs to run at 3600 RPM to provide 60Hz output frequency, assuming a 2 pole stator. Some electronic gizmos are not happy when the input frequency varies as would happen with a surging engine. (Not all of them complain). On a snowblower however, the electrical gizmos are much less sensitive to frequency.

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post #9 of 13 Old 03-22-2019, 10:27 PM
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Quote:
Originally Posted by contender View Post
I don't consider it good if its happening on a generator....
If it's powering a load, sure, surging is bad. But the loads should be disconnected before shutting it down. Personally, surging while shutting down an unloaded generator doesn't bother me.

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post #10 of 13 Old 03-23-2019, 01:11 AM
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It is just surging because the carb is running out of gas causing a lean condition, the engine slows down and the governor opens the throttle plate further to make up for it, then the increased vacuum at that particular spot in the venturi recovers enough to replenish with fuel to run again momentarily then the governor slows the engine back down, it will repeat that in cycles until the fuel supply drops to the point it will no longer recover and the engine finally stalls out from lack of fuel so the surging is perfectly normal and nothing to worry about when it happens during shutdown when you turn the fuel valve off and let it run itself out of gas in the carb.
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