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3) R Series 1970-1995 Air Cooled 2V 01e. Cylinder base GASKET [low octane 1.25mm]__All 1970-75
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This gasket is ONLY to be used if you desire to lower the compression of your 1970-75 R-bike. This is BMWs "solution" to the lower octane ratings in today's gasolines. If you are running the best gas you can find, and you still get a "knock" on mid-range throttle up, on a hot day; then installing this gasket is one possible solution.
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