We have best and newest pocket bikes performance parts in China.
The tuning big bore kits features are below:
1) Tuning big bore kits for 47cc and 49cc pocket bikes. 5 ports, newest and more higher performance.
2) Made of top quality aluminium, cnc machines. We have many colors.
3) Pistons have many extra holes for improving. Cylinder also is much improved for racing.
3) Use metal shining copper head gasket for long life.