Talking about crankcase portmatching

Hi there guys,

Talking about port matching the crankcase to transfer ports in the cylinder, what gains should do i expect? top end power? low end power? overall performance?

crankcase portmatching versus crankcase volume..what theory behind this?

The crankcase should be polished to better performance?

Thank you jaguar

Its quite wierd, because i port matched the crankcase, but i feel that i have no such power at high rpm.

It revs slight good, but high rms doesnt have power at all..

No, because the engine was all re-assembly, new piston, new oil seals, new roler bearings, etc..

Is in break in period yet..

Yes, now it has 400km, but the screw of the front (that sustains the engine) has broke