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From 1951 to 1969 the motors are basically the same, the R-69 became the 69-S with the rear floating bearing, differences are in the parts break downs, get the books. Many of us have quit using the floating bearing with no problems. many of the late US fork bikes have no sidecar mounts as the telefork was not for sidecar use. The rebuild book by Chris Bjetman (spelling?) is the best. Find it thru the vintage BMW sites. Total motor teardown is the only way to clean slingers. you did buy the bike already didn;t you? That is a bargain price. I agree, the front fender is mounted wrong.
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