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Makeing a bigger rxs is real easy just study how people do it to lots of older rd's one of the most common mod back then was the simple dt175 piston people still bore out bikes these days and use these pistons but that is by no means the limit :)to start with a small formula to help get ccm

pie radius squared x stroke
---------------------- = cc
         1000
where radius is half the diameter of the bore

This is the 115 Motor
Motor type: 2 stroke

Cooling:

Air cooled

Capacity:

115 c.c.

No. of Cylinders:

One

Bore and stroke: 54 x 50 mm

Actual compression:

7 : 1

Maximum Power:

16HP @ 8,500 rpm

Carburator Mikuni

Reed valve

4 petal A block

Transmission:

5 speed

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