Tecumseh HSSK 50 idle speed

strelnikov(NE IL)June 4, 2010

Does anyone know how to reduce the idle speed on one of these engines? Mine is way too fast. The owner's manual is useless, it says to take it to your service center.

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baymee(LehighValleyPA)

There should be a very visible screw to adjust the slow idle.

    Bookmark   June 4, 2010 at 10:53AM
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strelnikov(NE IL)

There is not. There is a screw to adjust the main throttle stop but at idle it doesn't even touch the stop screw. There is no idle speed adjustment on this carb. Apparently you do have to take the engine to a service center to adjust the idle speed. Well I'll never buy one of these engines again.

    Bookmark   June 4, 2010 at 10:46PM
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baymee(LehighValleyPA)

This is on a snowblower, right? And it has a throttle cable, right? The find adjustment for the high speed is on the throttle lever and the idle speed screw is near the throttle plate.

Can you provide any pics?

    Bookmark   June 5, 2010 at 6:49AM
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strelnikov(NE IL)

It's a replacement snow blower engine that I'm using for something else. It has no throttle cable, just a lever on the engine. I can provide some pics but not for a couple days.

    Bookmark   June 5, 2010 at 5:44PM
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baymee(LehighValleyPA)

this is a typical idle screw for a Tecumseh SK

    Bookmark   June 6, 2010 at 7:59PM
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strelnikov(NE IL)

That's what mine looks like but for some reason at idle the stop doesn't touch the end of the screw. Wonder what could be wrong?

    Bookmark   June 6, 2010 at 9:37PM
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baymee(LehighValleyPA)

If you can gently move the plate to idle and it opens up again to a higher speed, you could have the governor spring messed up, or an air leak. At idle, there should be no tension on any spring. There is also a spring attached to that throttle plate underneath the plate. Does the plate return to idle with no springs or linkage attached to it?

    Bookmark   June 7, 2010 at 6:27AM
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strelnikov(NE IL)

I moved the throttle stop against the screw and the engine stopped. I restarted the engine and pushed the stop toward the screw just a little and the idle dropped but the engine kept running about the speed I want it. Under the carb there is a spring attached to a vertical bar with a bunch of holes in it. I'm thinking if I move the spring down a hole at a time there will be less tension on the spring and I'll be able to get the idle down where I want it. Is that correct?

    Bookmark   June 7, 2010 at 9:47PM
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baymee(LehighValleyPA)

That's the governor spring and lever and it controls high speed, but one of the effects is that it will either speed up or delay a response to a load. At idle, there will be almost no tension on that spring. I'm getting the impression that the idle circuit of your carb is not clean, but I'm not sure why you have high speed in the idle position.

Try moving the spring, one hole at a time.

    Bookmark   June 8, 2010 at 5:56AM
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strelnikov(NE IL)

Okay thanks very much for your help. I will try experimenting with the spring position.

    Bookmark   June 8, 2010 at 7:36PM
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