KENIG Piston problem

Hahnda · Post by **Hahnda** » Fri May 10, 2013 3:31 pm

Looking for a little input on these. I have a CL77 in the shop that has them. I can actually read KENIG on the top of the piston through the plug hole.

I am building the bike but someone had already rebuilt the motor. The owner told me who but I can't remember. Anyway when I run the motor the piston is making contact with the spark plug, just barely, but enough to close up the gap to zero.

Has anybody used these before? Any input?

Hahnda · Post by **Hahnda** » Fri May 10, 2013 3:44 pm

I tried a different plug and now it doesn't happen. Maybe the index of the electrode just happened to be in the right spot to make contact.

It was only the left side. 3 times I pulled the plug to reset the gap. It would start fine then start backfiring on the left side. Pull the plug and zero gap.

G-Man · Post by **G-Man** » Fri May 10, 2013 4:01 pm

Kevin

I've seen HC pistons with a little divot ground out where the spark plug sits. I thought it was to get good flame propagation but you may have discovered the real reason.

G