Tecumseh HMSK100 won't stop surging - Snowblower Forum : Snow Blower Forums
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post #1 of 25 Old 10-23-2018, 04:17 PM Thread Starter
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Tecumseh HMSK100 won't stop surging

Hey guys, I really need some help here. I was given a snowblower and I can't get it to run properly.
It's a 10hp Tecumseh - HMSK100 - 159456W. The problem is that I can't get the engine to stop surging I was going to do a carb job on it but instead was convinced to get a brand new, non-adjustable carb. So I put that in and made sure all the linkages were in the same slots as before. Then adjusted the governor with the throttle wide open and there is plenty of tension on the throttle spring. Fired it up and it still runs like crap. So my next thing was valve adjustments. I pulled the head, cleaned out all the carbon and just in there. Inspected the valves and they seem to be in good condition. No pitting or warping. The clearance called for
.008-.012 for both valves so I went with a happy medium at .010. Cleaned everything nice, installed a new head gasket with the head. Put a brand new spark plug in and fired it up. And it still runs really bad. I changed the fuel line and primer hose just to be sure there's no leaks and still can't get it running good.

I'm at a loss for what else it could be? Unless it's a faulty carb. Any advice on which direction to go next would be greatly appreciated. This one has me stumped
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post #2 of 25 Old 10-23-2018, 05:47 PM
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Have you checked the condition of the gaskets on both ends of the intake manifold?
It's not unheard of to find shavings from machining in a brand new carb either.
I had replaced my worn out carb with one from oregon and it ran terrible. I found a used carb in decent condition and rebuilt it and now it runs great.
If your old carbs' throttle shaft isn't slopped out, you should rebuild it.
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post #3 of 25 Old 10-23-2018, 06:02 PM Thread Starter
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All new gaskets all around on the intake ends, new head gasket, and new gaskets on the crankcase breather (after doing the valves). I should have mentioned earlier that I bought 2 of the same new carbs because I also needed one for another snowblower. I put a carb kit in the original carb and all 3 carbs do the same thing. So I am fairly certain it is not a carb issue
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post #4 of 25 Old 10-23-2018, 06:26 PM
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Could also be weak spark. Did you check the armature gap while you were in there? Any rust on the flywheel magnets?
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post #5 of 25 Old 10-23-2018, 06:42 PM Thread Starter
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Just set the armature gap to .020 and wire wheeled the magnets. Good thinking but it sadly didn't help.
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post #6 of 25 Old 10-23-2018, 06:52 PM
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Sounds like you're into the governor/throttle linkage next. Do you have another engine to copy the link connection placements? If not, post pics of it as is. The PO could have done some accidental mischief while attempting a fix.

I just found a hm100 with the throttle lever spring inserted in the wrong hole/slot- that was enough to cause surge and more.
I usually adjust the governor lever in the middle instead of using the manual procedure - seems to work better.
Good luck to you!
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post #7 of 25 Old 10-23-2018, 06:57 PM Thread Starter
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This is the pic of my linkage setup.
I'll have to try setting the governor to the middle instead of it all the way to the end.
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post #8 of 25 Old 10-23-2018, 07:22 PM
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Your pic came through. The link locations look OK. How about a pic at the governor arm?
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post #9 of 25 Old 10-23-2018, 07:34 PM
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Originally Posted by Chris Fry View Post
This is the pic of my linkage setup.
I'll have to try setting the governor to the middle instead of it all the way to the end.

my linkage is in the same as yours just went and checked
try this start it up and get warmed up while its surging hold the gov arm and see if the surging stops
gov could be adjusted wrong take a pic of the arm is it forward toard the carb or pointed away from the carb when you look at it?

Last edited by 1132le; 10-23-2018 at 07:47 PM.
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post #10 of 25 Old 10-23-2018, 07:34 PM Thread Starter
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This is the governor arm setting. I loosened the torx screw, open the throttle lever up on high, turned the governor clamp clockwise as far as it would go and tightened the screw back up. I'm going to try the half governor thing right now
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