Spark plug Tecumseh HMSK80? - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 01-20-2015, 12:48 PM Thread Starter
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Spark plug Tecumseh HMSK80?

I have an Tecumseh HMSK80 with a Campion RJ19LM spark plug. Is this correct plug or should it be Champion RJ8C?
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post #2 of 14 Old 01-20-2015, 12:56 PM
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It looks like the Champion RJ19LM is the correct plug:

Tecumseh 4-Cycle Spark Plug Conversion Chart
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post #3 of 14 Old 01-20-2015, 01:37 PM
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it is the correct plug, but the ngk br2lm is a much better plug, and cross references to a rj19lm
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post #4 of 14 Old 01-20-2015, 03:02 PM Thread Starter
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it is the correct plug, but the ngk br2lm is a much better plug, and cross references to a rj19lm

Thanks, will order an NGK plug.
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post #5 of 14 Old 01-20-2015, 03:34 PM Thread Starter
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http://vid71.photobucket.com/albums/...m/IMG_5875.mp4
No good...
Runs like an old donkey..
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post #6 of 14 Old 01-20-2015, 05:21 PM
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Quote:
Originally Posted by HS80 View Post
http://vid71.photobucket.com/albums/...m/IMG_5875.mp4
No good...
Runs like an old donkey..
From your Vid I assume you had the spark plug off and touching it near the spark plug hole, if so you have a nice blue spark which should work well once the plug is back in. Since I saw you had another thread pertaining to your engine, is it because the engine runs bad? Has the carb been cleaned?

Snow Removal Apparatus I own:
Ariens ST1530DLE, and good ole arm powered scrapper.
The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.
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post #7 of 14 Old 01-20-2015, 06:18 PM Thread Starter
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Changed spark plug.
Cleaned carb, and still runs bad. I have never had a tecumseh that worked perfect for years
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post #8 of 14 Old 01-20-2015, 08:48 PM
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Well, it would appear, with the flame out of the exhaust, that your valves may need to be lapped and adjusted. As I sure that you are aware of, the flame and rough operation are a good indication of lost compression. I know that you posted previously, on what you've done so far. I am not sure that you have dug into it, thus far. And if you have the ability to conduct a compression test, I might suggest that to verify compression.

Another possibility, that the carburetor may be running too rich, which is a simple adjustment. A rule of thumb, is to screw the mixture adjustment screw all the way in, and back out 3 revolutions. Or, you could start with turning the adjustment in 1/4 of a turn, while it's running to see if it improves.

"runs like old donkey" I can honestly say that the first time I've heard that.

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MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.

Last edited by db9938; 01-20-2015 at 08:58 PM.
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post #9 of 14 Old 01-21-2015, 07:17 AM Thread Starter
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I think compression looks good, not measured but works fine. Engine start at 1-3 pull. There is no adjustments on the carb...

Engine type:
http://i71.photobucket.com/albums/i1...m/IMG_5863.jpg


Engine running:
http://vid71.photobucket.com/albums/...m/IMG_5880.mp4
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post #10 of 14 Old 01-21-2015, 09:05 PM
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Well, it's either a compression leakage issue, or the carburetor is not able to maintain the proper fuel air ratio. With these emissions regulated engines, they are particular to having all the internal passages clean.

I've found that an inexpensive ultrasonic jewelry cleaner works great. Others will recommend a chemical bath type, and they do work, but I'm completely unfamiliar with what to recommend, as I've never been to Norway and do not know what you have available.

Garage:
MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
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