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Message: [QUOTE="placelast, post: 226854, member: 22683"] 1) OEM '89 RM (yes, RM) 250 head gasket ($12) or Cometic Hi-Perf. RMX top end gasket kit, White Bros. Part #95-7735 ($32, '93-up, [url]http://www.whitebros.com/CompletesectionPDFS/ENGine.PDF,[/url] Page 23). 2) Eric Gorr low-end porting (a bargain @ $120). 3) 52-tooth steel rear sprocket + extra links; got both 4 U 2 try. I've got the RB carb bore/divider plate ($150+); I did not notice much of a change down low. What year is your RMX? The pre-'93's have larger exh. ports; post '95 have rediesigned intake tracks. [/QUOTE]