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Message: [QUOTE="gregorious77, post: 1334480, member: 101894"] No need to split the cases for crank seals. you only have to drain oil and remove clutch cover then remove clutch basket and the gear from the end of the crank for oily side and the other side is done by taking off the magneto. special tools required are clutch basket holder and flywheel puller. I have a 1984 RM125 and had very similer problems to you. mine turned out to be very worn cylinder and wrong piston (flat top instead of domed) check out this site for exploded views of the engine [URL=http://www.cmsnl.com/suzuki-rm125-1981-1982-usa_model16170/partslist/]click here[/URL] and get yourself one of these [URL=http://cgi.ebay.com/ebaymotors/CLYMER-SERVICE-MANUAL-for-RM125-500-1981-1988_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem160311322790QQitemZ160311322790QQptZLHQ5fDefaultDomainQ5f210]click here[/URL] [/QUOTE]