can anyone of you tell me which is the best bore kit out there.....which gives most hp..and maybe some prices...thx

 

There are many kits out there for the Raptor. Curtis Sparks and trinity seem to have the best kits. Sparks 690 won four stroke wars last year. Trinity has a 686 and is a really strong kit. My cousin has the 690 and is beating 420 long rod banshees on alky left and right. Dont know the horsepower numbers on the kits but i would figure anywhere between 55 and 70 horsepower. Tremdous improvement over stock. As for pricing pull up the websites www.sparksracing.com and www. trinityracing.com. Hope that helps.

 

is there a robertson 727? I like the sparks 690

 

Yes, the Yamaha Raptor is a big bore... Oops I didnt see the "kit" part of the question LOL

RoostKing...