Trek Lime Lite 100cc build

I drained the carb and fuel lines and put in 32:1. I also took apart the carb to see if everything was correct -- appears to be. It runs a little better, but still a constant miss, and will only hold an idle if I have the screw almost all the way in. The engine is running way too rich -- I have a lot of fuel/oil around the bottom of the muffler. I was hoping that if I ran it wide open for a mile or so it would dry out and run smoothly -- nope.
 
Found the problem -- E3.32 plug is slightly too long and the piston struck it. I put the China plug in and it runs great now.

E3.32 plug.jpg
 
Some of the kit supplied plugs have threads that are too short, the best plug I've found are ngk-B6HS and B7HS. The 6 is a higher heat range than the 7. I have run the B5HS in winter.
 
You can run the BP type ngk if the plug indexes to clear the piston, I've replaced a bp5hs with the same plug and the replacement hit the piston. You can mark the curve of the electrode with a sharpie on the plug body to see where the electrode is when the plug is tight.
 
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