Compression on hmsk 80 - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 01-20-2016, 05:05 PM Thread Starter
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Compression on hmsk 80

I put the Compression tester on biggie this morning, since I've changed the engine few days ago. Well it didnt turn out all that good.

The specs I beleive should be between 80 and 100 psi..I got 40 psi engine cold..kinda slapped me in the face since I tought that motor was running ok.

It started ok, idle ok and works ok too in the snow when I tried it..

Anybody know if I can get thru winter with that?
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post #2 of 14 Old 01-20-2016, 05:14 PM
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are those #'s from a recoil or electric start?


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post #3 of 14 Old 01-20-2016, 05:27 PM Thread Starter
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Recoil start. Cold engine.
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post #4 of 14 Old 01-20-2016, 05:40 PM Thread Starter
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Just thinking of this: could it be valves not seating right in valve seats? Im not a small engine pro..im more car trucks inclined..lol
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post #5 of 14 Old 01-20-2016, 05:43 PM
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Unlike an airplane, don't trust your gauges.

If it feels like it's running ok, it's running ok. Are you doing it in an unheated area with the engine cold, cold ??

Might also be a compression release for easier starting.
What are your engine numbers, mod, ser, family ...

Might want to try it with the electric.

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Make sure the windows are up before the snow plow goes by !!

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post #6 of 14 Old 01-20-2016, 05:46 PM
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Originally Posted by lsengines View Post
Just thinking of this: could it be valves not seating right in valve seats? Im not a small engine pro..im more car trucks inclined..lol
That is pretty low even for a recoil however it really depends on how hard you're pulling it over.

your engine has a compression release that opens the exhaust valve a tiny-bit to help with pull starting.


electric start can overcome the release mechanism, or look into doing a leakdown test instead.


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Last edited by classiccat; 01-20-2016 at 09:30 PM.
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post #7 of 14 Old 01-20-2016, 05:48 PM
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...and here's donyboy video explaining it



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post #8 of 14 Old 01-20-2016, 06:23 PM Thread Starter
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Thanks to you all it answers my questions..pretty hard to get true compression with decompression mechanism. .loll! Then again I tought the old motor was running allright.
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post #9 of 14 Old 01-20-2016, 06:26 PM Thread Starter
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I got two broken bolts holes for starter..so no starter for now :/
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post #10 of 14 Old 01-20-2016, 09:08 PM
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I agree with classiccat about doing a leak down test. The length of hose on compression testers has a direct impact on what readings you get also.

Does putting a little oil in the cylinder increase the compression reading? If the rings are good, the oil will only increase compression by about 5 pounds. I would say that if the engine starts easily, runs without popping and RPM's stay up when putting a load on it, your good to go. I'll do a compression test on my 8 hp tomorrow and post the results in this thread.( I'm guessing it will be around 50 to 60 psi with the pullstarter)

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