Tecumseh HMSK-80 throttle position - Snowblower Forum : Snow Blower Forums
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post #1 of 20 Old 01-27-2016, 09:19 AM Thread Starter
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Tecumseh HMSK-80 throttle position

Just have a quick question I'm hoping someone with a proper working, preferably all original HMSK-80 or other variant can help me with as it's not really mentioned in any of the FAQ's or service manuals.


When your engine is off and the throttle is all the way up does the carb open 100%? As in butterfly wide open, can't open anymore.

Or, does it open most of the way, 80-90%?

When I got my machine the engine was in pieces and so far I've replaced the throttle control, both linkages and adjusted the governor as per the manual. I don't believe the governor can pin the butterfly wide open, just most of the way. If I adjust it so it can, it can't close it enough to idle.

My guess was the governor should be able to move the butterfly it's entire travel but it doesn't seem mechanically possible as the governor doesn't travel far enough.. It's tough being I had nothing to compare this to before putting it all back together.



Engine runs great (Ok, for a Tecumseh), works great it just this has been bothering me and I'd like someone to confirm it's proper. You never know what's "normal" with a Tecumseh.

1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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post #2 of 20 Old 01-27-2016, 09:53 AM
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Did you run through the governor adjustment Chris?



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post #3 of 20 Old 01-27-2016, 09:56 AM Thread Starter
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Originally Posted by bad69cat View Post
Did you run through the governor adjustment Chris?
https://www.youtube.com/watch?v=SSwSIA8qgR8
Yep.
The governor arm wasn't even on the engine when I got it.

But like I said, the governor arm it self literally doesn't seem to have enough travel to go from wide open to completely shut. I can have wide open, but won't idle low enough, or idles fine but won't open 100%.

1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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post #4 of 20 Old 01-27-2016, 10:02 AM
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guess I have never paid that close attention - maybe they don't go fully open? Not sure off the top of my head - but I would have thought it should also. Somebody will chime in I'm sure



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post #5 of 20 Old 01-27-2016, 10:11 AM Thread Starter
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guess I have never paid that close attention - maybe they don't go fully open? Not sure off the top of my head - but I would have thought it should also. Somebody will chime in I'm sure
Yeah.
I'm not sure if this falls under "something's not quite right" or "Tecumseh" There's a fine line between those two. Or, not.

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1933 GE Monitor Top refrigerator restoration video

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post #6 of 20 Old 01-27-2016, 11:14 AM
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Hello Chris, I just pulled the heater box on my HM-80 motor to check the throttle for you. With the throttle set to fast, the throttle plate is wide open and actually takes a little finger pressure to move it towards the idle stop.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro 421-E (38585) 2008 (New Owner)
Experience is something you don't get until just after you need it.
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post #7 of 20 Old 01-27-2016, 11:21 AM Thread Starter
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Originally Posted by Grunt View Post
Hello Chris, I just pulled the heater box on my HM-80 motor to check the throttle for you. With the throttle set to fast, the throttle plate is wide open and actually takes a little finger pressure to move it towards the idle stop.
Hi Grunt,
Thanks for taking the time to do that for me.

So when your throttle is all the way up, the throttle plate is against it's wide open stop? You can't open it more with your finger?

1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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post #8 of 20 Old 01-27-2016, 11:25 AM
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Hi Chris. The throttle is held wide open against the stop and is under some pressure in this position.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro 421-E (38585) 2008 (New Owner)
Experience is something you don't get until just after you need it.
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post #9 of 20 Old 01-27-2016, 11:51 AM Thread Starter
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Hi Chris. The throttle is held wide open against the stop and is under some pressure in this position.
Interesting.
I wonder if the hole on the throttle plate I was lead to believe was the correct one actually isn't?

1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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post #10 of 20 Old 01-27-2016, 11:58 AM Thread Starter
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Here's how I have mine setup.

As you can see, I've got a lot of new parts on there, all genuine Tecumseh.
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1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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Last edited by ChrisJ; 01-27-2016 at 12:01 PM.
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