86 250r frame with a 88 swingarm

what would i have to modify to put a 88 250r swingarm on a 86 frame. since the mounting of the 86-87 and 88-89 are different what mods do i have to do? there has to be something to do with motor mounts for the rear.???

[Taco]

well you will have to weld in some rear motor mounts for the enge because you cant use the mounts that mount in the center of your swingarm pivot bolt.

[dune250r]

The geometry of an 86-87 250R frame is different than the 88-89. the front suspension on the 88-89 is further forward by 1 inch and the swingarm is 1.5 inches shorter than the stock 86-87. Unless you put aftermarket a arms on the front that are 1 inch forward you may notice a difference in the way your bike handles on jumps. And also, there definetly would be welding involved to put that swingarm on your bike.