Today I managed to get a Polaris 350 2 stroke engine from a friend who had a old trailboss 350 he was parting out. I was looking at it and it seems almost identical to the 400 2 stroke in my scrambler just the head looks differant b/c the spark plug hole is offset and not in the center like on my scrambler. Could this 350 motor just be a smaller displacing 400? Im curious bec i was looking for a spare motor to build up just incase. Are there big bore kits for these 350's?