Spark plugs

[baseroom]

What are the correct plugs for

What are the correct plugs for a 1963 QD - 24 10 hp Johnson? The book says J8C's but on these strings I have seen J4C's and J6C's mentioned. I purchased it with J6C's and want to replace. Thanks.

 

[joereeves]

"The J8C is too hot and will c

"The J8C is too hot and will cause piston damage. What book states that plug?

The J4C and J6C are the proper plugs. Due to the engines age, the J6C will probably result in better performance."

 

[baseroom]

"[url=""]http://www.sparkplugs

"http://www.sparkplugs.com/results_appOther.asp?otherMotiveID=12414&mfid=2
Thanks!!! I got that information from this spark plug website. Thanks for saving me some baaaaad stuff!!"