Originally Posted by bro-die
I took a size 10 socket to confirm and it is a size 10. Overall its a fun bike I never thought Id go back into my childhood years and have fun with these things.
I think the consensus then is that you probably have a BGF 48cc motor there...
Does anyone know if a BGF 66cc has 10mm nuts on the head studs, or larger? (Cause the 10mm head studs is what is making me guess its 48cc)
I know what you mean about feeling like a kid again on these bikes, it's just too much fun! Keep it up, she will run better as she breaks in, and better as you move to the regular fuel mix. After riding and tinkering for a while you will get the hang of it and will probably find several ways to increase your speed and ability to pull up hills.