Turns out I do have a 14mm. Its totally stock. Your saying with my stock bike a 15mm bing & a good pipe the puch can be at 50mph? I overmixed the gas/oil at 25:1 (I swear it said that mix on the side cover) & I was getting up to 30mph. The bike has 624 original miles. Carb has a busted top gasket (bings are hard to put back together I thought. That damn top gasket) So Im going to make my own until I order a new part.
Theres a polini 64 kit with a 50 hi hi head. What components deciphers the engines cc. I dont understand the 64cc kitt with a 50cc head.
Thanks