BMW R 1100 RT - User Manual

A repair manual for BMW R-series motorcycles addresses common throttle-related issues like engine surges or imbalance caused by friction in components such as the throttle cable, butterfly linkages, and idle-air screws. The guide covers diagnostic procedures–including part replacement lists tied to specific model years–and maintenance steps like synchronizing throttle butterflies using tools like the Synchro tool. It also details exhaust gas analysis, including adjustments for catalytic converter-equipped bikes (e.g., measuring CO₂ levels) and non-catalytic models (adjusting CO content via a potentiometer). Safety and calibration best practices are emphasized throughout.

Page 1 – Throttle Cable Friction Remedy and Warranty Information
Page 2 – Throttle Cable Repair Procedure and Parts Listing
Page 3 – Throttle Cable Adjustment and Synchronization
Page 4 – Idle-Air Screw Balancing and Exhaust Gas Testing
Page 5 – Adjusting Exhaust Gas CO Content Without Catalytic Converters

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Distribution:

Dealer

Sales

Accessory

Parts.

Service

Set-Up



BMW NA

Principal

Manager

Workshop

Bulletin Date 08/20/2000

Main Group: 32

For USA Only

Bulletin #: 2748

Steering

Please initial and route to the following before filing

Service

Parts

Sales

Warranty

Tech #1

Tech #2

Tech #3

Tech #4

BMW Motorcycle Operations

Service Bulletin

Problem:

Engine surges at constant speed. Difficult to adjust and balance the left and right
throttle bodies.

Cause:

Differences in opening and closing of the throttle butterflies caused by friction in the

throttle cable.

Remedy:

1. Fit a low friction throttle cable.

2. Check the following to ensure optimum results:

Ignition timing
Spark plugs (FR 6DDC) type / condition (reference SI 2739 in Main Group 12)
Valve clearances
Correct Cat. code plug
Check throttle housing inlet manifold for air leaks

3. Synchronize the throttle butterflies as illustrated on the attached procedure.
Note: Make sure there are no obstructions in the vacuum stub pipe prior to
connecting the Synchro tool.

Parts:

32 73 1 342 149

R 1100 RS

32 73 1 342 150

R 1100 RT, R, & GS

Information:

The Low friction throttle cable was introduced into series production as follows:

R 1100 RS

from 0312537 onwards (06/95 prod.)

R 1100 GS

from 0381479 onwards (06/95 prod.)

R 1100 R

from 6379238 onwards (06/95 prod.)

R1100RT

from 0440499 onwards (06/95 prod.)

R 850

from the start of production

Warranty:

The BMW Motorcycle Limited Warranty will cover the replacement of the throttle

cable for motorcycles in the affected VIN range. Authorization is not Required. File a
warranty claim, using the following information:

Subject:

R1100/850 Model Throttle Cables

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About this manual

Brand: BMW
Model: R 1100 RT
Document type: User Manual
Language(s): English
Pages: 5
File size: 116.6 KB
Format: PDF

Summary

Page 1 - Throttle Cable Friction Remedy and Warranty Information

Remedy for engine surges and throttle imbalance caused by friction in the throttle cable, including installing a low-friction cable, checking components, synchronizing throttle butterflies, and warranty terms for replacement parts.

Page 2 - Throttle Cable Repair Procedure and Parts Listing

Instructions for repairing throttle cable issues on R1100 series motorcycles, listing defect codes, flat rate units, routine service notes, and the repair procedure with cable routing diagrams.

Page 3 - Throttle Cable Adjustment and Synchronization

Technical instructions for adjusting the throttle cable, connecting the BMW Synchro tool, specifying free play measurements, warnings regarding butterfly stops, and guidelines for checking column balance.