cylinder-base-spacer-11-009-78-1057r-978

( Service-Information e;.;.BMW MOTORRAD GMBH Motorcycle R 60/5-R 100 RS Munich,Sept. ~3 Service Technic R-VK-11 ma-ur Engine 11 009 78(10S7R For U.S.A. and Canada onl7 Subject: Cylinder Base Spacer for R 60/5 – R 100 RS Dear Dealer, Due to poor availability of high-octane fuels in some regions, pre-ignition pinging may occur on the above-mentioned models. In such cases it is possible to reduce the compression ratio by installing cylinder base spacers. Depending on the fuel quality available, up to two spacers per cylinder may be installed. Note from the following chart how much the compression ratio will be reduced after one or two spacers have been installed. The chart will also indicate the correct part numbers of spacers to order for various model year machines, since models before 1975 incorporated spacer #11 11 1 255 001 as standard equipment. As of 1976 model year production, this spacer is not used, and the cylinder foot is lengthened 0.5 mm correspondingly. Before installing the spacers they must be coated on both sides with Hylornar SQ 32/M. This will insure reliable oil sealing. Models 1970 – 1975 Compression Ratio Spacer “All Spacer “BIi Spacer “A” and Models (Standard) Only Spacer “B” Together R 60/5-/6 9.2 8.6 8 . l R 75/5-/6 9. 0 8.4 8.0 R 90/6 9.0 8.4 8.0 R 90 s 9. 5 8. 8 8.4 … /2 I Kenntnis genommen – Pris connaissance – Noted – Tornado nota – Presa conoscenza 1 Ablage – Archives – Fite – Archive, ~etriebs!eitung ~ Werk.stat! KD-Annahme ! Gewahrl -Sachb i Te1ledienst I Betrrebsle11ung , Werk.stat! – 2 – S. I. 11 009. 78 (.1957Rl. Sept. 78 Models 1976 and up * Compression Ratio No Spacer Spacer ltc II With 2 Spacer ”C* Models (.Standard l. Only To’.;[ether R 60/6 – /7 9 •. 2 8 •. 6 8,0 R 75/6 – /7 g, a. 8 ,4. 7 ‘:l R 80/7 9. •. 2 8. 6 8 .. a R 9.0/6 9.., Q 8,4 7 •, ‘l R 9.0 s 9. •. 5 8,8 8 ,3 • R 100/7 9.’ a 8.4 7.9 R 10.0 s 9.; 5 8.8 8 .,3 R 100 RS 9_. 5 8 •. 8 8,3 NOTE:. Ora.er cyl:i;nder spacers by part numbers:- ”’A~ – 11 11 1. 255 001 (0,5 mm X 97 •. 0 mm ~): 1~B’1 – 11 11 l 257 09.2 (l.2mmx 9.7.0 mm ~)_ “c”· – 11 11 l 335 650 ca. 7 mm X 99,0 mm ~l These are theoretical values. It is possible that tolerances of approximately+. 5 per cent may occur in practice due to the finishing technig:ue. Very truly yours, MW MOTORRADG MBH. unich .V. i.V. G~tY \ Due to E.P.A. emission regulations, motorcycles built after 1-1-78 cannot be altered. (