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Old 08-17-2008, 06:33 PM   post #1 of 15
snowboy151
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Default spark plug question

I have a model 7254 (1965) that if I look in the owners manual it calls for a Champion J-11-J spark plug gapped at .025 I am not aware of Champion even making that plug anymore. In all my Lawn boys I use Champion CJ-14 and in my snowblowers I use CJ-8 What do all you other lawnboy enthusiast's use??????
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Old 08-17-2008, 07:24 PM   post #2 of 15
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Default Re: spark plug question

Quote:
Originally Posted by snowboy151 View Post
I have a model 7254 (1965) that if I look in the owners manual it calls for a Champion J-11-J spark plug gapped at .025 I am not aware of Champion even making that plug anymore. In all my Lawn boys I use Champion CJ-14 and in my snowblowers I use CJ-8 What do all you other lawnboy enthusiast's use??????
According to this site, that plug has been superceded by SF8E or J11C.
http://www.clubplug.net/champ_ngk.html
Hope this helps.
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Old 08-17-2008, 10:47 PM   post #3 of 15
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Default Re: spark plug question

Its a D-400 so I would use a cj14 at .025 gap and be done with it. I never even heard of a j11. All of my "C" and "D" engines use a cj14.
In fact all of my lawnboys have a cj14 except the "M" which uses a NGK.

Neal
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Old 08-18-2008, 02:01 AM   post #4 of 15
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Default Re: spark plug question

CJ 14, Use that in all my mowers, the tiller and the Snow-Boy.
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Old 08-18-2008, 09:11 AM   post #5 of 15
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Default Re: spark plug question

Neal, the M manual calls for the CJ-14 also, but I'm sure the NGK's work just as well or better. I'm running those as o.e.m. in the E series.
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Old 08-18-2008, 09:17 AM   post #6 of 15
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Default Re: spark plug question

Autolite 258 on D & F
and
O.E.M. NGK on Duraforce.

I think the "V" takes a different plug, but don't remember what I've got in it.

Doug
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Old 08-18-2008, 09:32 AM   post #7 of 15
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Default Re: spark plug question

Quote:
Originally Posted by echoman View Post
Neal, the M manual calls for the CJ-14 also, but I'm sure the NGK's work just as well or better. I'm running those as o.e.m. in the E series.
Yeah, I have a bunch of the NGK equivilants for the cj14. Off the top of my head I think its a B4MY something or another.

Otherwise the champs serve me well for many years in most apps.

Neal
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Old 08-18-2008, 08:17 PM   post #8 of 15
snowboy151
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Lightbulb Re: spark plug question

Somewhere either in an owners manual or a service book I seem to remember reading that the snowblowers in the 60's all used or called for CJ-8 Is there anyone who has a copy of an old owners manual or service book that can set me straight on this..?? I would really appreciate it. Thanks.
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Old 08-20-2008, 12:06 PM   post #9 of 15
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Default Re: spark plug question

Hi Chris,
Here is a link to the Toro owned Lawnboy service book which they have graciously posted online. Section 12 deals with snowblowers. Check it out here: https://lookup3.toro.com/ttcGateway/...als/lball.html

Hope this helps.

Best wishes,
Bob
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Old 08-21-2008, 01:40 AM   post #10 of 15
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Default Re: spark plug question

I put a CJ-14 in mine, standard a plug as you can get. You can use a 5846 which is the same but resistor type. The RJ12C is a copper core resistor type that will work as well.

J11C is equivalent to the J11J that they don't make anymore. Same as above 3 plugs but is a non-resistor copper core.

They all have the same threads and reach

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Last edited by tgore3; 08-21-2008 at 02:00 AM.
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Old 06-25-2009, 11:18 AM   post #11 of 15
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Default Re: spark plug question

As a research-oriented person, when facing the decision as to what spark plugs to run in Lawn-Boy 2-cycle engines, I searched archived discussions, edited their most instructive, and ran some manufacturer-site searches. Since others commonly face this same question, I'm providing the following copy of my edited notes, without crediting specific writers. I changed some language and spelling to improve communication.
*****copy follows*****
Suggested CJ-14 Champion decoded by Champion's site Chart
CJ = 14mm thread size + 3/8" reach + 3/4' or 13/16" hex
14 = Heat Range/Application where 1-25 is "Automotive, Small Engine & Ordinance"
"CHAMPION PLUGS GET HOTTER THE HIGHER THE NUMBER,
COLDER THE LOWER THE NUMBER."

Champion CJ14 130-385 ( Champion CJ8 is a colder heat range plug than CJ14)
NGK BM4A 130-708 (Toro viewer says NGK BPMR4A )
Mega-Fire SE-14JC 130-70
Denso W14M-U/ 130-986
Bosch Not Listed in cross reference chart
Autolite 258 plugs in Lawn-Boy D-series & F-series engines

"Most of the DuraForce owners seem to prefer the NGK."

Lawn-Boy's 1965 model 7254 owners manual called for Champion J-11-J spark plug gapped at .025 inch.
That plug was superceded by SF8E or J11C. J11C is equivalent to the J11J, which they stopped producing.

"I use Champion CJ-14 in mowers and CJ-8 in snowblowers."

A Toro/Wheelhorse manual said:
Lawn-Boy 200 series should be fitted with Champion J-8, CJ-8 or RJ-12.
Lawn-Boy 417 model should be fitted with Champion RBL-15Y. (a tapered-seat plug)
Lawn-Boy 310, 312, 314 and 416 models should be fitted with Champion RH-10 or H-10.

"Don't spend extra money to buy a "Diamond Fire" spark plug unless an engine is nearly worn out
because it won't produce much improvement. But "Diamond Fire" spark plugs really help old engines."
(No explanation was provided about which manufacturer was offering "Diamond Fire" spark plugs)
*****end copy*****

I will first look for NGK BM4A 130-708 or NGK BPMR4A pricing.
If the second listed NGK includes an internal resistor, I'll eliminate it from my candidate list.
Then I will look at Champion CJ14 pricing.
If they are close, I will go with the NGK product because over years of trials on non-Lawn-Boy applications,
I have been most satisfied with NGK plugs.
You will have to make your own decision, but this summary may help you make a more informed choice.
Has anyone ever seen evidence that a spark plug fitted into a Lawn-Boy engine had too-high heat range?
I've seen plenty of fowled plugs, but never one that appeared to be running too hot?
A plug that's too-hot does NOT cause the same symptoms as excessive heat from too-lean fuel/air ratios.

Hope these edited comments and heat range chart are instructive.
Notice that the most-common Champion CJ14 is a pretty darned hot plug.
Champion CJ8, which is a cooler running plug won't self-clean as well so would appear to be more subject to fowling.
John

Last edited by LoveLearn; 06-25-2009 at 11:39 AM.
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Old 06-25-2009, 11:56 AM   post #12 of 15
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Default Re: spark plug question

Thanks for the link Mike..

Quote:
Originally Posted by johnsonmk View Post
According to this site, that plug has been superceded by SF8E or J11C.
http://www.clubplug.net/champ_ngk.html
Hope this helps.
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Old 06-25-2009, 11:59 AM   post #13 of 15
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Default Re: spark plug question

So a ' CJ-14 ' plug is pretty much a standard plug for Mowers??

I always wondered if there was just a standard plug for mowers..
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Old 06-25-2009, 12:07 PM   post #14 of 15
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Default Re: spark plug question

I find that the most common to non-lawnboy models are RJ19LM's.......(usually in briggs motors)
As for LB's I think that CJ14 seems the most common
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Old 06-25-2009, 10:36 PM   post #15 of 15
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Default Re: spark plug question

I'm willing to bet the original Champion plug was a J14J, not a J11J. CJ14 replaced the taller (yet identical heat range) J14J, and is used in every Lawn-Boy engine except the V, latest model F, and DuraForce. They use a Champion RJ12C and NGK BPMR4A, respectively.

On a Lawn-Boy with points ignition, you want a 0.025" plug gap, and on the solid-state ignition, it's 0.035" for every engine except the DuraForce which is 0.030".

BTW, the NGK equivalent to the Champion CJ-14 is BM4A, or BMR4A for the resistor version.
I worked on a 10545 that had an original equipment NGK BMR4A in it. I about fell over when I saw a non-DuraForce Lawn-Boy sporting an NGK plug, but then it dawned on me...Champion didn't make a resistor version of the CJ-14, and it may have been mandated by that time, so it started to make sense. The recommended Champion RJ12C is actually one step colder than the CJ-14, but is recommended by Lawn-Boy in the latest F and V engines.
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