I live in Indianapolis looking to bye with cash and my quad is a 2003 400ex I would like to put the right engine on it but I put in the part about the mid 80s 1983 - 1985 250 yz 250 or 1998 cr 250 because I have a few top-ends that have been ported for alcohol and used on a micro-sprint I used to race I would need a good bottom-end because the clutch was cut off and flywheel was welded and the kick start removed for use in the micro-sprint I was thinking of maybe building a 250 2 stroke and retrofitting it on there Its close in power to weight ratio and I thank it might fit I have over 10 years of part fabrication
getting the exhaust pipe to fit right might b tricky but engine mounts are easy