I have a 1985 trx 250x and want to know if i could swap it out with a 1988 350 motor. Im mostly concerned about driveshaft size, do the 250 and 350 have the same driveshaft size? I dont want to snap it with a bigger motor. Also things like wiring harness and just plain clearance. Now i do have a lot of room in the engine bay being that its air-cooled, and motor mounts im not worried about you can make anything fit with the right tools of course. Any help would be appreciated. Thank You.