BMW R1100 Spécifications télécharger pdf (Page 58)

the idle RPM is 1000 or less! If your R1100 is like mine, the timing will be

advanced 50% further than the "OT" to "S" mark, for about 9 degrees of initial

advance. If so, put everything back together and, if during your test ride you

detect no noticeable detonation, you are in business.

Valve Lash Increase - Rob Lentini

If you are like me, try this. I like low and mid-range driveability and throttle

response. My R1100RS would not idle for several minutes on cold mornings

until I increased valve lash. Increasing valve lash FIXED the problem, and I've

lost no discernible top-end power. Increased valve lash is equivalent to closing

the valves sooner--"milding" the cam timing.

Set the valves COLD from/to:

Intake: Spec: .006" to: .012"

Exhaust: Spec: .012" to: .014"

Your idle will be MUCH smoother and throttle response immediate but

controllable. Increase in valve noise is minimal. Valves will run cooler.

Results of Increased Valve Lash and Advanced Timing - Rob

Lentini

The following results were obtained from several runs on a dyno with my 1994

R1100RS:

1. Advanced timing (9 degrees) results in a 2 - 4 horsepower increase across

the entire RPM range. The 4 horsepower increase was in the meat of the power

band, from 6000 RPM and up. There was no detonation.

2. The average torque and horsepower, across the entire 4th gear roll-on range,

3500 - 7500 RPM, was improved by increased valve lash.

3. Increased valve lash and advanced timing (9 degrees) netted an average

torque increase of 3.1 and an average horsepower increase of 4 over stock

valve lash and stock timing (6 degrees).

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BMW R1100 Spécifications Page 58