big bore head or not
 

ive had a 80cc kit in for awhile. should i upgrade the head. will it give me a speed boost.

The big VALVE head will improve performance, the big bore head with stock valves will just lower compression and decrease performance.

OK that is what I've been looking at the big valve head. another thing is they say to check the valve to piston clearance what do i do if it is too tight, if anything? or should i just throw it on and hope i'm lucky? what do you think?

use two base gaskets

thanks

I need one baddd

Adding 2 base gaskets also lowers comp.
You should always check for piston to vavle clearance

brilliant.

I have two base gaskets on my 52mm kit with a9 cam and big valve head, i think if i used one the electric starter wouldn't start it, due to the compression