big bore or stroke?

I would take the vforce because they are only two strokes. Boyson has been working on their four stroke side because the stupid environmentalist had all the manufactures stop making two strokes. So I would use something made by someone who knows two strokes
 
Also go with a 240 head instesd of a sleave. The head kits sleave last longer than a sleave put in the original head. Go with vitos or ct racing.
 
Also go with a 240 head instesd of a sleave. The head kits sleave last longer than a sleave put in the original head. Go with vitos or ct racing.

Head OR cylinder??
And how do you figure that?, I've got the LA Sleave kit on my Blaster in the original cylinder and it's got over 100 hrs on it now!?