Tecumseh Snow King 7hp stalling when hot at WOT - Snowblower Forum : Snow Blower Forums
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post #1 of 13 Old 02-11-2018, 01:32 AM Thread Starter
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Tecumseh Snow King 7hp stalling when hot at WOT

I replaced the carb on my ST724 and thought I had it dialed in, but not after using t for awhile. Once it is fully warmed up (I have been using it for 10+ minutes) at WOT it will stall as soon as a heavy load is applied that requires the governor to "throttle up". It will NOT restart by hand at WOT, but will restart by hand at a lower throttle setting. Also, if you "throttle up" quickly it will stall.

I have been closing down the high speed jet thinking it is running too rich. Is this correct ? It seems to idle fine so I have not touched the low speed jet.

I know I need to check the valve clearance, so should I just put off tweaking the carb an further until I do that ?
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post #2 of 13 Old 02-11-2018, 02:49 AM
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Not starting at a higher throttle setting makes me think the main is too lean, not too rich. Lower setting are on the idle circuits . . . Failure to take load is also consistent with lean.

Could also be a bad carb. What was the problem that motivated you to replace it? You could always clean the old one and try that again as well . . . .
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post #3 of 13 Old 02-11-2018, 03:25 AM
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in my tweaking of the carb the low speed screw should also be adjusted, im not talking about the idle speed set screw sitting beside the throttle plate linkage.
on a warmed up engine, at wot adjust your high speed , when it sounds good lower throttle to just before kill switch and adjust your low speed. bring it back up to wot again and use slight increments in either high or low speed screw to achieve proper mix. at wot, and maybe everything below wot, carb uses both jets to achieve fuel mix
imo, ymmv

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Last edited by vinnycom; 02-11-2018 at 03:29 AM.
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post #4 of 13 Old 02-11-2018, 10:16 AM Thread Starter
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Quote:
Originally Posted by tadawson View Post
Not starting at a higher throttle setting makes me think the main is too lean, not too rich. Lower setting are on the idle circuits . . . Failure to take load is also consistent with lean.
I am sorry, I am not following you. Too lean on the high speed jet or too lean on the low speed (idle/primary) jet.

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Originally Posted by tadawson View Post
Could also be a bad carb. What was the problem that motivated you to replace it? You could always clean the old one and try that again as well . . . .
I am pretty certain the carb is good. The old one had a sunken float. A new float and carb kit cost cost more than the replacement.
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post #5 of 13 Old 02-11-2018, 10:18 AM Thread Starter
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Originally Posted by vinnycom View Post
in my tweaking of the carb the low speed screw should also be adjusted, im not talking about the idle speed set screw sitting beside the throttle plate linkage.
on a warmed up engine, at wot adjust your high speed , when it sounds good lower throttle to just before kill switch and adjust your low speed. bring it back up to wot again and use slight increments in either high or low speed screw to achieve proper mix. at wot, and maybe everything below wot, carb uses both jets to achieve fuel mix
That is what I am struggling with !
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post #6 of 13 Old 02-11-2018, 05:06 PM
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Originally Posted by theoldwizard1 View Post
I am sorry, I am not following you. Too lean on the high speed jet or too lean on the low speed (idle/primary) jet.


I am pretty certain the carb is good. The old one had a sunken float. A new float and carb kit cost cost more than the replacement.
Too lean on the high . . .

And cheqper is not necessarily better . . .

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post #7 of 13 Old 02-12-2018, 01:29 AM
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if it stalls and won't restart when hot, the valves need to be regapped.

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post #8 of 13 Old 02-12-2018, 08:54 AM
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Originally Posted by Ariens hydro pro View Post
if it stalls and won't restart when hot, the valves need to be regapped.
But it will restart when hot at partial-throttle. Just not at full-throttle. Which, to me, seems inconsistent with the only cause being a valve that won't seal when hot.

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post #9 of 13 Old 02-12-2018, 04:47 PM
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Have you done a compression check on the motor. With full throttle you may not be getting enough suction of fuel & air, to start. With partial throttle the position of the throttle blade may help with enough to draw the mixture in. I've seen when Tecumseh's have really poor compression, the plug will be bone dry, not enough of vacuum to draw the mixture in.




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post #10 of 13 Old 02-13-2018, 11:13 AM
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Just a thought! I had a 7 Snowking doing similar things. After a year or 2 I found some drag marks on the flywheel. Adjusted the air gap and all better... Just a thought!
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