Substitute for Champion J-8J spark plugs

[Waunnaboat]

Hello,

I apologize for the numerous posts I have been starting in the past few weeks, but I have too many projects to complete this summer.

I am in the process of restoring a few motors, and many of them use a Champion J-8J spark plug.  Are there any good substitutes for them?  The motors in subject are a 1941 Sears Waterwitch 1 hp and a 1941 Evinrude Sportwin.  Another Evinrude from the 40s I have has a J17Lm spark plug on it, and those are much easier to find in my area.  I just wanted to check if there are easier to buy substitutes before I buy the ones on eBay that are original (and subsequently more expensive).

Thanks

 

"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."

[Waunnaboat]

Typo on the title.  Should be Champion, not Chamption.

"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."

[Tubs]

I use the J17Lm (lawn Mower) plug in all my small motors, Pal’s Scout, Ranger, Sea King Midget, 3/4 hp waterwitch, and any motor that requires a short plug because of the motor covers pressing against the spark plug boot. Look to the right side of the page across from the date and you’ll see an edit option for corrections. Your participation brings life into this
board and the conversations that take place here are intended to build interest in the hobby. Keep posting.

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

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Waunnaboat

[RICHARD A. WHITE]

I can find J8’s at my local Tractor supply, actually have a few… that I do not need, pay actual shipping only and they are yours…

http://www.richardsoutboardtools.com
classicomctools@gmail.com

1 user thanked author for this post.

Waunnaboat

[Waunnaboat]

Those are the Champion J8J spark plugs and not the HJ8J or J8C spark plugs?  I bought a few HJ8J thinking they were the same, but they have  a smaller thread.  If they are the regular thread J8J spark plugs I would be interested.

"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."

[RICHARD A. WHITE]

I will dig them out this evening to confirm but pretty positive the are J8J.

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[Waunnaboat]

Sounds good.  email me at nathankillian46@gmail.com, and if they are J8J plugs, I would be happy to pay for the shipping.

"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."

[fleetwin]

Tubs wrote:

I use the J17Lm (lawn Mower) plug in all my small motors, Pal’s Scout, Ranger, Sea King Midget, 3/4 hp waterwitch, and any motor that requires a short plug because of the motor covers pressing against the spark plug boot. Look to the right side of the page across from the date and you’ll see an edit option for corrections. Your participation brings life into this
board and the conversations that take place here are intended to build interest in the hobby. Keep posting.

Tubs, admittedly this confuses me.  But, I know that champion recommends the J17LM for my two stroke Toro snowthrowers.  In my feeble way of thinking, this plug was meant for four stroke lawnmowers.  I would think it would have a cooler heat range than a two stroke plug because it doesn’t need to contend with burning off oil in the combustion process.  But who knows, perhaps I am thinking about this all wrong….  Surely never had any fouling issues using the J17LM in my two stroke snow throwers though.

[outbdnut2]

Does anyone know if the Champion DJ8J  (also called a Champion #847) is a replacement for the J8J?  Link to the plug at Champion’s website below.

Dave

https://www.championindustrialplugs.com/champion-847-dj8j-nickel-spark-plug

Edit – I just found this which I think answers the J8J question this post was about – Note when you scroll down to the long list of equivalents, J8C is in the cross ref list, but Dj8j is not:

https://www.sparkplug-crossreference.com/convert/CHAMP_PN/J8J

[eltoquad]

I bought 4 CJ8 (843) from Amazon a week ago for $2.99

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