BBK?

[kevino]

I see all sorts of kits for sale on  Amazon.    As I understand it,  80cc cylinder kits can be installed by simply replacing the 50cc jug and piston.    But what about 100cc kits?   I assume they need  cutting into the block, different crankshaft, camshaft and rod?  At what point is it better to buy a bigger engine?  

TIA,

kevino

[FrankenMech]

Check out the forum section for BBK.

[aeroxbud]

I think a lot of the 100cc kits are only 81-88cc. Check the bore size. 47mm=72cc, 50mm=81cc, and a 52mm=88cc.
It's hard to put a 150 engine into a 50cc. It has very different mounting points.

[kevino]

THANKS,