Re: Spark Plugs

Posted by JWL On 2012/9/11 22:27:28

Kevin,

Just make sure you get the correct reach plugs (in addition to the right heat range). Brand be damned.

You will ruin a motor if 3/4" reach plugs are installed in an engine designed for 7/16" reach plugs. 7/16" reach plugs will go into a 3/4" spark plug hole and work, but the bottom threads of the spark plug hole exposed to combustion will carbon up and you will not be able to install the correct 3/4" plugs the next time.

So, a 7/16" plug can go into a 3/4" hole, but a 3/4" plug cannot go into a 7/16" hole. Good night...

(o[]o)