Help

[ajhancock]

Thought this would be the best place for advice on my 82 250r. We are rebuild ing the top end right now. Have a few questions on piston size. Want to leave it stock but right now has no power band at all. Bottom end makes a bearing type rattel almost a grind. Any ideas?? If anyone Knows the piston size for a stock 82 250R and how much space to leave in the ring that would be great!! Also want to put smaller tires on front and back any suggestions?? 8)

[trikerider2oo7]

the bore is 70mm (2.756 in)

and why would you want to convert it to 4 wheels???