Originally Posted by jameslow
Btw is it really very useful to seal up the crank shaft? Overall show great improvement to the engine? Bec from what i know, by modding the crank is the area u can get more power than modding the sleeve! Im i right?
The silicone is only used when you have a drilled / lightened crank. The deal is that you remove weight from the crank ( towards the clutch side) and then you fill the void with the much lighter silicone, to keep the crankcase volume about the same.
To get good, usable power from an engine, you'll have to modify the entire engine, crank timing and all of the sleeve ports, otherwise you'll have a funny running engine.