i have a 1983 200s motor in a 200x frame i have a 200x carb on it but want to go to a bigger carb i have a 240 kit with a highcompression piston, webcams, ported and polished with corba alluminum race series exhuast jetted and has a K&N on it. will a carb off of a 250 honda three wheeler bolt on and work?

 

The 250 carb isn't going to work at all without making your own intake manifold and airboot.

The only bolt-on is using the XR intake and carburetor, but even then, you will have to modify the airboot. haywoodjalikme had some pics of this setup on his photo page. Check them out.