Lightening and balencing pistons does 3 things:

#1 Less reciprocal mass = faster reving motor
#2 Windowing the piston = more flow area at any given position in the cylinder
#3 Balancing the piston = less vibration which will make more power and less motor
Any one of these by themselves would be enough reason to do it, but with all 3
together, it only makes sense to have this
do ne.
All single 2 stroke pistons $45.00

All twin 2 stroke pistons $100.00

A - arms