intake-system-modification-13-007-84-2120-884

( Service-InformationM otorcycle Group: 13 BMW of N.A. Service Department Fuel Supply & Adjustments August 1984 13 007 84 (2120) Modifications to the Intake System on R80GS, R80ST and R80RT Models For USA and Canada Only As a means of optimizing the part-load power characteristic on these models and reducing fuel consumption, the intake system has been modified and the followi,19 new parts incorporated: 1. Cover for air cleaner housing Part No. 13 72 1 337 675 with 2 intake orifices of different sizes (as on R65 and R65LS) 2. Carburetor Left: Bing V 64/32/351 Part No. 13 11 1 337 811 Right: Bing V 64/32/352 Part No. 13 11 l 337 812 Technical data as follows: Main jet Needle jet Needle position Idle jet Slide advance 135 2.66 3rd 45 7.5 notch from top 13 ii /33 b q,;.Lf If complaints are received on motorcycles already delivered, the following converstion can be introduced as a remedy: (However, not through warranty._) 1. Replace one intake pipe in the cover of the air cleaner housing with a pipe having an internal cross-section at the intake orifice of 30 x 19 mm. Part No. 13 72 1 337 501- 2. Installation of Size 135 main carburetor jets Part No. 13 11 1 256 612. Sincerely, BMW OF NORTH AMERICA, INC. Richard Dampf National Technical Manager Motorcycle Group RD/cl