Spark Plugs

[baconbiscut]

Hi I have a 1955 5.5 hp johnson would it be ok to put champion L77JC4 spark plugs in it . I know the right spark plug is J6C but all wal-mart had were J8C which I heard runs the motor to hot and i figured that this plug wouldn't hurt because it says JC4 in it and i fgured that would run it cooler correct me if i'm wrong and tell me if it is alright to put this plug in my engine

 

[BoatBuoy]

Re: Spark Plugs

I don't know the answer to your question, but try a good auto parts store. If they don't have them, they can get them. Sometimes Wal-Mart uses the stock number designation which is 823 for J6C. I would use what's recommended.

 

[seahorse5]

Re: Spark Plugs

Hi I have a 1955 5.5 hp johnson would it be ok to put champion L77JC4 spark plugs in it . I know the right spark plug is J6C but all wal-mart had were J8C which I heard runs the motor to hot and i figured that this plug wouldn't hurt because it says JC4 in it and i fgured that would run it cooler correct me if i'm wrong and tell me if it is alright to put this plug in my engine

Do NOT use the L77JC4 plugs in your 5.5! Those plugs have 1/2 long threads on them that will protrude into the combustion chamber, and may even hit the pistons.

The J6 plugs, and all the " J " series have 3/8" thread length which is what the motor requires.

You can use J4C or J4J plugs and they may foul just a bit quicker if you do a lot of low speed running. J8 plugs will work, especially if you are going to do a lot of low speed running.

 

[DHPMARINE]

Re: Spark Plugs

I wear size 9 1/2 shoes.Sometimes I will buy 9's or 10's.I never buy 6's or 13's.

DHP

 

[Gary H NC]

Re: Spark Plugs

I wear size 9 1/2 shoes.Sometimes I will buy 9's or 10's.I never buy 6's or 13's.

DHP

 

[baconbiscut]

Re: Spark Plugs

Thanks I was about to change them but before i did i compared the old ones to the new ones and noticed that the new ones were bigger. I'm glad i didn't put them in that would probably be sad ending of my motor and stupid mistake thanks alot Dan.

 

[Marc III]

Re: Spark Plugs

NAPA sells Champions at a reasonable price.