Question about correct spark plug to use


Old 12-17-07, 02:54 PM
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Join Date: Dec 2007
Posts: 4
Question Question about correct spark plug to use

I have a Yard machine snow thrower that was bought online at Amazon .com several years ago, I believe Fall of 2003.

The manual that came with it shows the model number as being MTD E640F
although on the product page described it as:
Yard Machine 31AS640F352
8 HP
Two-Stage Snowthrower
8.0 HP Tecumseh engine with electric start
26" clearing width and 21" intake
6 forward and 2 reverse speeds
12" impeller
16" Sno Hog tires

The model number on the snowthrower itself is:
here is a link to the Amazon product page:

I cannot find any label on the engine to identify it.
And there was no engine manual that came with it.

I have no idea what spark plug to purchase as the markings on the plug I removed are not very readable.
As far as I can tell it looks like either
Champion RJ17LM or RJ19LM
Would anyone here know which is the correct plug?
Also, are those 2 Champion spark plugs interchangeable?
And would anyone know where the engine label might be hiding on this particualr snowthrower model?
Any help much appreciated!
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Old 12-17-07, 03:42 PM
indypower500's Avatar
Join Date: Aug 2007
Location: new hampshire
Posts: 118
The correct plug for this is the J19LM. The J17LM will work and is used in tillers, garden tractors. 19 is a hotter plug and used for cold weather operation where the 17 is a colder plug used for warm weather operation.
Your engine #is LH318SA-156553.
The ID label is found near the bottom on the right side of the fan housing(housing that the recoil starter is bolted to).
Old 12-18-07, 04:40 AM
Thread Starter
Join Date: Dec 2007
Posts: 4
Thumbs up RE: correct spark plug

Thanks indypower500 for your response!
Appreciate your help!
I will look for that elusive ID label today.
Old 12-19-07, 06:34 AM
Thread Starter
Join Date: Dec 2007
Posts: 4
Thumbs up Label Found - Label Info

Hello All,
Found the ID label for the engine,
just about where Indy500 said it would be (Thanks Indy500!),
only almost on the very bottom.
In case anyone else has same snow thrower,
here is the info found on the label:
engine ID Label info:
Model: HMSK80
Moderate (C) Life Period
SPEC: 155693x
Engine Family: 3TPXS3812BF
DISP: 318cc
Warranty: H
DOM: 03337CB0236

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