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Throttle Screw and TPS Adjustment for Dummies - Stephen

Karlan (reviewed by Rob Lentini)

I. The Problems.

Surging -- A condition of increasing and decreasing power, cycling back and forth,

when the throttle is held aabsolutely steady at a fixed rpm (such as 3,500 rpm while

using a throttle lock, tape or rock-solid hand). The electronic control system is hunting

(up and down) for the correct air/fuel mixture and the engine is not responding to

throttle input but to electronic sensors.

To minimize surging, the throttle plate screws (two) and the Throttle Position Sensor

(one TPS on the bike) are adjusted using a voltmeter. (There can be other factors, but

an incorrectly set TPS is the 95% problem.)

Vibration -- Shaking or oscillating. When the throttle is held in a fixed position, the

vibration is constant and unchanging. It may vibrate more at one throttle opening (rpm)

than at another; i.e. it may vibrate more at idle (or is more noticeable at idle) than at

3500 rpm.

To minimize vibration, the throttle bodies (one for each cylinder on each side of the

bike) are balanced using mercury columns.

Ensure that the valves have proper clearances before starting any fine tuning and that

plugs and wires are operating correctly. Instructions on performing a valve adjustment

can be found at http://www.ibmwr.org/rtech/r1100_valve_adjust.html

II. The Approach.

It is quite possible that a bike has both a surging (throttle plate screws and TPS) and a

vibration (throttle body) problem. With these instructions, you will address the surging

and vibration problems in that order. If you do not have a surging problem, DO NOT

adjust your TPS ! If you do not have a surging problem, DO NOT adjust your TPS ! If

you are not sure about your problem, then do not continue with these instructions and,

instead, balance the throttle bodies using "Throttle Body Balance for Dummies". In

fact, I strongly recommend that you balance the throttle bodies at least twice before you

use the instructions in this article. Throttle body balancing is relatively fast and easy to

accomplish and, you will need to balance the throttle bodies as part of setting the

throttle plate screws and TPS.

In addition to surge and vibration, some bikes will present an idle anomaly in which the

idle will be too high. The idle problem, which is nothing more than an idle in excess of

1200 rpm, occurs most frequently on GS and R models after resetting the throttle plate

screws and the TPS. This problem is addressed at the end of the TPS adjustment

instructions. Idle speed also is addressed in "Throttle Body Balance for Dummies" if

you are only performing a throttle body balance.

The basic knowledge about adjusting the TPS and basic throttle settings to obtain

optimal engine response is the work of Rob Lentini; his Zero=Zero article appeared in

MOA's Owners News and is on the IBMWR web site at http://www.ibmwr.org/tech.html.

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BMW R1100 Spezifikationen Seite 38