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Old 07-29-2011, 01:42 PM   post #1 of 31
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Default What engine do these spark plugs fit?

Champion

rn14yc
rn11yc4
rn9yc
cj7y
cj8
cj8y
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Old 07-29-2011, 05:53 PM   post #2 of 31
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Default Re: What engine do these spark plugs fit?

lol

CJ8 and CJ8Y would be something you would find in smaller briggs flatheads that have the ground out switch that hits the top of the plug to turn it off. Ive seen them in some weedeaters and saws as well, same with the CJ7Y

RN11YC is a longer reach plug, Overhead valve style engines, its not the long reach of the RC12YC that is spec for Kohlers, Briggs, etc...so it wouldnt work right in most current OHV engines. It is Very close to a plug that Honda uses, an NGK BPR6ES-11 It fits most Kohlers, Alot of Kawasaki engines,



RN9YC is similar to the rn11yc, different heat range. Fits some Hondas, some Robins...too many to list specifically.

RN14YC
Kohler M8, Kohler TJD Wisconsin Series, Cushman with Daihatsu 3cyl, Robin EH29C, Kohler EH-25
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Old 07-29-2011, 10:37 PM   post #3 of 31
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Default Re: What engine do these spark plugs fit?

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Originally Posted by RED-85-Z51 View Post
lol

CJ8 and CJ8Y would be something you would find in smaller briggs flatheads that have the ground out switch that hits the top of the plug to turn it off. Ive seen them in some weedeaters and saws as well, same with the CJ7Y

RN11YC is a longer reach plug, Overhead valve style engines, its not the long reach of the RC12YC that is spec for Kohlers, Briggs, etc...so it wouldnt work right in most current OHV engines. It is Very close to a plug that Honda uses, an NGK BPR6ES-11 It fits most Kohlers, Alot of Kawasaki engines,



RN9YC is similar to the rn11yc, different heat range. Fits some Hondas, some Robins...too many to list specifically.

RN14YC
Kohler M8, Kohler TJD Wisconsin Series, Cushman with Daihatsu 3cyl, Robin EH29C, Kohler EH-25
Thanks for answering the question. Just thought I ask because of all different plugs for lawnmowers, chainsaws, etc. Not like there going in a car or truck. Whatever happened to using a simple j19lm in everything?
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Old 07-29-2011, 11:42 PM   post #4 of 31
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Default Re: What engine do these spark plugs fit?

Actually, the plugs you listed have hundreds of automotive and industrial purposes for each of them...they just "also" fit some lawn equipment.
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Old 07-30-2011, 08:39 AM   post #5 of 31
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Default Re: What engine do these spark plugs fit?

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Actually, the plugs you listed have hundreds of automotive and industrial purposes for each of them...they just "also" fit some lawn equipment.
IMO, Too many different plugs for lawn equipment in general when the average homeowner throws it away every year or 2 years cause they cant it to run right.
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Old 07-30-2011, 12:25 PM   post #6 of 31
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Default Re: What engine do these spark plugs fit?

The RN9YC,RN11YC and RN14YC are all 3/4" reach 14mm plugs,with the "9" being the coldest and "14" being the hottest ones..many Imports and Mopar ehicles use these plugs as well as some small engines..

The "C" in a CJ-8 and CJ8Y stands for "chain saw" ,they have a smaller sized hex than a regular J-8 ,I think its either 3/4" or 11/16" Vs 13/16 for a J-8...the ceramic is shorter so they'll fit under the handle on a saw and not protrude so far as to be in the way...they are also used in many engines that a J-8 is listed for...

The J17LM and J19LM are used in many engines that had J-8's listed too,the heat range is very close ,the ceramic is shorter than a J-8 plug..


Speaking of spark plugs,heat ranges are inportant...I had flooded my Kohler last time I went to mow with my Yard-Man and had to put fresh plugs in before it would start--it takes RV15YC4 plugs,all I had close on hand were much colder ones,RV8C,that have a shorter reach and the electrodes do not protrude from the base much compared to the right plugs--it started and ran OK,but I felt a loss of power right off the bat,like it had 10 HP instead of 20,and it was rather sluggish when I went to throttle it up,and it bogged down in places that never bothered it in high grass before....
I replaced them with the AC equivilant to the Champions (R46TSX) and man,it was like I bolted a new engine in there!....starts instantly,revs up nice and now the govenor doesn't even kick in if I'm going thru tall weeds...the RV8C plugs looked like charcoal when they came out--way too cold !!..
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Old 07-30-2011, 09:55 PM   post #7 of 31
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Default Re: What engine do these spark plugs fit?

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The RN9YC,RN11YC and RN14YC are all 3/4" reach 14mm plugs,with the "9" being the coldest and "14" being the hottest ones..many Imports and Mopar ehicles use these plugs as well as some small engines..

The "C" in a CJ-8 and CJ8Y stands for "chain saw" ,they have a smaller sized hex than a regular J-8 ,I think its either 3/4" or 11/16" Vs 13/16 for a J-8...the ceramic is shorter so they'll fit under the handle on a saw and not protrude so far as to be in the way...they are also used in many engines that a J-8 is listed for...

The J17LM and J19LM are used in many engines that had J-8's listed too,the heat range is very close ,the ceramic is shorter than a J-8 plug..


Speaking of spark plugs,heat ranges are inportant...I had flooded my Kohler last time I went to mow with my Yard-Man and had to put fresh plugs in before it would start--it takes RV15YC4 plugs,all I had close on hand were much colder ones,RV8C,that have a shorter reach and the electrodes do not protrude from the base much compared to the right plugs--it started and ran OK,but I felt a loss of power right off the bat,like it had 10 HP instead of 20,and it was rather sluggish when I went to throttle it up,and it bogged down in places that never bothered it in high grass before....
I replaced them with the AC equivilant to the Champions (R46TSX) and man,it was like I bolted a new engine in there!....starts instantly,revs up nice and now the govenor doesn't even kick in if I'm going thru tall weeds...the RV8C plugs looked like charcoal when they came out--way too cold !!..
Thanks for the info. Didnt know what the "C", "9", "11", and "14" stand for. What about the the "DJ" series? Like the DJ8J?
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Old 08-03-2011, 11:58 AM   post #8 of 31
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Default Re: What engine do these spark plugs fit?

Ok, so if the C is chainsaw, what would RJ19LM mean? That is what my Craftsman walk behind takes.
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Old 08-03-2011, 01:18 PM   post #9 of 31
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Default Re: What engine do these spark plugs fit?

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Ok, so if the C is chainsaw, what would RJ19LM mean? That is what my Craftsman walk behind takes.
The R stands for resisitor plug
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Old 08-03-2011, 02:27 PM   post #10 of 31
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Default Re: What engine do these spark plugs fit?

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The R stands for resisitor plug
Ah ok. I am going to guess the L means L head engine? How about the J and M then?
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Old 08-03-2011, 02:58 PM   post #11 of 31
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Default Re: What engine do these spark plugs fit?

I'll have to post back later with my Champion book in hand ,to list all the meanings of the letters and numbers..I believe a plug witha "D" prefix means the ground electrode does not cover the entire center electrode,a "retracted gap" is the term I think they used...
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Old 08-03-2011, 11:25 PM   post #12 of 31
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Default Re: What engine do these spark plugs fit?

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I'll have to post back later with my Champion book in hand ,to list all the meanings of the letters and numbers..I believe a plug witha "D" prefix means the ground electrode does not cover the entire center electrode,a "retracted gap" is the term I think they used...
or really these posters could google champion spark plug and get all that info
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Old 08-04-2011, 01:09 PM   post #13 of 31
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Default Re: What engine do these spark plugs fit?

...yeah,and might be able to do something ELSE instead!....

(I dont mind being helpfull,but google IS a wonderful source of info!)....

Still looking for my Champion plug catalog!......its right where I left it,wherever THAT was!...
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Old 08-05-2011, 08:44 AM   post #14 of 31
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...yeah,and might be able to do something ELSE instead!....

(I dont mind being helpfull,but google IS a wonderful source of info!)....

Still looking for my Champion plug catalog!......its right where I left it,wherever THAT was!...
i don't have one but if I did , it might be with the digital caliper and the air drill that I can't find.
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Old 11-23-2011, 06:01 PM   post #15 of 31
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Default Re: What engine do these spark plugs fit?

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...yeah,and might be able to do something ELSE instead!....

(I dont mind being helpfull,but google IS a wonderful source of info!)....

Still looking for my Champion plug catalog!......its right where I left it,wherever THAT was!...
Any luck? I couldnt find anything on google.
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