Quote Originally Posted by daz71 View Post
I was riding my b1 and its lacking power,it has 6tooth front and 68 rear .
What can i do to get it up to speed in 14mm class, Im going to pull it apart and check the reed valve, and adjust the clutch, i know its trial and error.
Im running it on 40:1 mix with 98 octane.
GOT ANY TRICKS.
Hello,
We just got back from testing many types of Pocketbikes on the Dyno, this was during a large race track meeting.

Found on a few of the water cooled and air cooled modified, the ones getting lots of RPM (over 9200), vibration from the frame and engine was aerating the fuel, (producing tiny air bubbles that build up inside your carb) causing power loss.

We fixed this by using a T junction in the fuel line and running another fuel hose up above the fuel tank. You can either put a breather on the end, or just put it back into the fuel tank.

This removes the air immediately and also provides 2 lines of fuel to the carb.
Bikes all pulled cleanly with no more problems.

Also, we found the jetting needle size .70 worked best over all, for the E2 style carbs ( though I think these are 19mm from memory)

Anyway, this mod can be used on any bike, its cheap and works.