whats the difference?

[rebel red ex]

whats the difference between a high compresion kit and a big bore kit ?

[Sparks425Ex]

A big Bore kit is just when you bore out the cyclinder which raises the CCs.

a highcompression kit is no bore just where you get a pistion with higher compression. That will raise the compression of your quad giving some more torque.

When you bore somthing out more ppl get a high compression pistion anyway.