I just trashed a piston in my wife's blaster and it scored the cylinder wall pretty bad. The question is if I am going to replace the jug and maybe get a better head while I am at it, should I go with the big bore kit, or just stay at 200cc? I don't want to have to change the carb as I just put a 28mm d-slide on it about a week ago and a K&N filter and can't justify changing those things already. The quad has an FMF gold fatty pipe I think(something like that anyway) and an FMF silencer, v-force 3 reed system, and the above mentioned 28mm d-slide carb and K&N filter. Is this enough to support the 240cc kit, or should I just stick with a standard bore high compression kit or something? Thanks.

 

If you stay with the stock bore, you can get the cylinder ported and head mod for about $175. This will up your compression to your specification, stock is 125 psi on a Blaster, you can go 145 without running race gas and that alone will bump your power up, and the porting will help a bunch too. So for that amount of money added to your rebuild you can pick up a substantial amount of power, kind of like the difference when you first put on the exhaust pipe.

Or buy a Vito's 240 cylinder ready to bolt on for about 600 bucks. Your current carb etc will work fine on a big bore, not quite optimum but still fairly well.