A buddy of mine has a 87 250x and his motor is f*cked up and he wants to put a different motor on. Are there any motors that will mount right on with no customizing. A 300ex motor looks the same with that bolt right on guys let me kno what will just bolt right on.

 

300ex will go right in, you need the 300 wiring and battery though. The 350x engine fits if you cut a little piece off the engine, with a hack saw. Real easy to do and way more power.