I want to buy a WRH big bore kit.
can you say me if there is a big difference between stock and big bore cylinder ?
Does I need a new head or can I keep the stock one ?
What is the difference between an Uni filter and a KN filter ?

 

What's this goin in?
I think {if it's an LT80} you'd be better off with a port & polish & some good ol fahion clutch mods.
Throw a line out there for LT80{Jack} if this is for an LT80 machine, he will set up in the right direction !

 

I'm sure Billy will correct me if I'm wrong. I think the difference in cylinders is the bore only. You does need <G> the aftermarket head for it as the stock head can be modded, but the results will be better on the aftermarket head.
You will also need a pipe,reed cage and carb for it.
IF you are going to race the machine, PLEASE find out whether your race circiut allows mini's over 90cc's.This could save some pain.
The difference between the filters are:: the uni is a foam filter. The K&N is a surgical fabric (cloth)

 

it is for a predator 90
I try to buy at WRH by net but I canot because I m not american
I try to phone but never answer.May be the number is wrong . Confirm me
001 251 675 9906