Hey guys I’m a new member. I have an 84 atc 250r that I’m wanting to change up a little bit. I was looking at a 290 big bore kit. My question is, are big bore kits bolt on once I get it back from the company? Or is there other thing I need to do? Had the bike for a while, it’s still completely stock so I don’t have much knowledge on changing things up. Thanks for the help