HSSK50 is hunting - Snowblower Forum : Snow Blower Forums
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post #1 of 11 Old 03-02-2015, 03:54 PM Thread Starter
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HSSK50 is hunting

So, after servicing the exhaust valve on my 5 hp Craftsman blower it starts and runs but oscillates (hunts) especially at idle. If I screw the idle mixture adjuster in I can get it to almost be stable, but it's nearly closed at that point and going further will stall the motor.

The carb is new, bought in November, and has less than 5 hrs on it. I've sprayed carb cleaner in the idle mix screw hole with no effect.

It didn't do this before the engine service, and I've checked that the intake manifold and carb are tight. Gaskets are new.

Under load the machine runs stronger than it has in years. If I can correct this problem, it'd be like a new machine.

Where should I be looking?

TIA

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post #2 of 11 Old 03-02-2015, 04:08 PM
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so it hunts at both idle (low-speed) & high-speed / no-load?

Have you tried going the other direction with the idle jet? Starting at 1-1/4 and trying 1-3/8, 1-1/2, etc?


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post #3 of 11 Old 03-03-2015, 09:44 AM Thread Starter
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Yes to both questions. No load high speed is a quick cycle, idle is much slower.

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post #4 of 11 Old 03-03-2015, 03:34 PM
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The only thing I can think of that that may effect idle after a valve service would be the head gasket or intake gasket leaking.
Try spraying some carb cleaner around these areas to see if it effects idle. If so it would suggest a leak.

But is sounds more like the idle circuit is dirty.

Did you soak the carb over night in carb cleaner and blow out with compressed air?

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post #5 of 11 Old 03-03-2015, 03:59 PM
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If you have a hunting engine at wide open throttle and no load, you have a carb issue or your governor linkage is improperly attached. MH
http://www.asos1.com/tecumseh4hp/Tecumseh.pdf

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post #6 of 11 Old 03-03-2015, 04:54 PM
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This is a tricky one....smells a little different than the normal idle-circuit issue...many people either set their idle jet too lean...or the idle circuit is restricted from fuel storage, improper cleaning, dirty fuel system, etc.

What you're describing is a rich condition suggesting an air bleed restriction (air ports in the venturi) or a leak at the intake manifold. It's a new carb so the throttle shaft shouldn't be leaking.

The L-head troubleshooting guide, indicates that incorrect float height could also cause a hunting/erratic idle.

...Or you bought the wrong carb for your engine.


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post #7 of 11 Old 03-03-2015, 07:33 PM
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Like motorhead64 said, are you sure your governor and throttle linkages are connected properly, or at least the same as they were before?

I just deliberately changed a link position on my governor, and that apparently introduced some surging. I'm going to put it back when I get a chance, and see if the surging goes away, but it's really the only change I made (no engine internals, or mixtures, were touched).

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post #8 of 11 Old 03-03-2015, 10:47 PM
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To confirm what others have said. I've had this problem when I messed with the throttle/governor linkage on my HSK50. I just put it back in it's original position as best I could and the problem went away.
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post #9 of 11 Old 03-04-2015, 08:35 AM
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the OP's problem exists at idle when the governor shouldn't be engaged; the throttle shaft spring swings the butterfly closed.

Dave C, please confirm that you're getting surge when the throttle butterfly is resting (and not moving from) the idle-speed screw...when the motor is warm.

I wouldn't go mucking with the governor until you get that idle condition fixed; odds are that the high-speed / no load condition will disappear once you correct it.


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post #10 of 11 Old 03-04-2015, 09:04 AM
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The governor rarely needs adjustment unless it's been tampered with....but the links can easily be misconnected. The manual shows the proper link attachments for all Tec engines. If they are not put back correctly, they will not perform correctly. That being said, I'd still be looking at the carb as the culprit. MH

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