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Ok ill clear up the misinformation here.
Mainly because the Scooter world especially 50cc the idea of Spin Balancing a Rotating assembly seems to be some foreign subject.
The problem of such a increase in Piston assy weight is easily and inexpensively sending your Rotating assy to one of the fine Crank companies in the states and have the Rotating assy spun balanced and the Crank pin welded for under a hundred bucks.
So it only Pounds the crank because you did Not do a proper and correct job of having the assy spun.do that and you won't have any crank or rod problems
The other thing your doing that leads so many to failures is the engine is already clapped out and from the boards get taped into a bbk, well how well do you think the cracnk is going to hold up when its almost done and you have doubled the horsepower?
The other thing is how many bbl kits of 50mm and 52mm do you think these scammers could sell if they told you you had to do crank work? darn near None! Us USA manufactures do not do business in such a unscrupulous way.


exactly



The is not such thing as in building lets a a small block chevy and throwing a crank as set of rods and a pistons and Not having the assy spun its mandatory.
On my big bore kits for bikes as a example a 883 Harley is a debar 1200, well pistons available were so much heavier you Had to rebalance the assy, well heck we design a 1200 piston for the 883 that was the same weight as OE and a reverse dish on the dome to maintain stock compression ratio for $210 and change with No Balancing or Head work Required, I columned keep them on the shelf.