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Message: <blockquote data-quote="stephmeister" data-source="post: 117" data-attributes="member: 33"><p>For a '96 TRX400FW, it's true the original cylinder is long discontinued, and some people do swap in a '98 TRX450 top end since those are easier to find. If you go that route, you need to check bore size , head compatibility and make sure the piston, rings and cooling passages line up correctly, otherwise you could run into sealing or clearance issues. Have you looked into whether the 450's intake and exhaust ports match up with your 400's head?</p></blockquote><p></p>