1) higher performance racing cylinder with cut head
2) top quality aluminum with red color, silver color and blue color
    The cylinder is also top quality. The kits are so smooth, stronger,
    shining and attractive. The kits are much better than others.
3) The fin and 4 screws are much stronger.
4) cylinder inside ported
5) copper gasket
6) piston has an extra hole
7) better compression function
8) Crankshaft is strengthened for your options.
9) spark plug with better performance
10) suitable for all pocket bikes