We did, its a 91 cylinder and head with a 74mm piston. I got the cylinder from a friend that used it for dirt track. we just changed the port timing and compression for hillclimbing. along with other mods.
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2004 CR250
1984 YT60 Tri-Zinger  1991 KX500 Hillclimber 2004 custom chassis.  1998 KX310 Hillclimber  1998 CR250 Hillclimber  |