BMW R 1100 S (1998-2005) Simplified Maintenance Schedule and Service Intervals

This is the maintenance schedule and associated service intervals for the BMW R 1100 S, one of BMW’s classic sportbikes with boxer engines, culminating in the gorgeous “Boxer Cup Replica”, the same bike but with some different paint and parts.

The BMW R 1100 S is powered by an 1085 cc air-cooled Boxer twin, with some additional oil cooling. The engine has side mounted chain-driven camshafts on each side that operate the valves by means of tappets and short pushrods.

In the R 1100 S, the 1085cc engine makes peak power of 72 kW (97 bhp) at 7500 rpm, and peak torque of 97 Nm (72 ft-lb) at 5750 rpm. Quite impressive for an air-cooled engine. Final drive is via a shaft, like with all BMW boxer-engined bikes of its generation.

The BMW R 1100 S was eventually replaced with the BMW R 1200 S, the last boxer sportbike (aside from the HP2 Sport).

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Service Intervals for the BMW R 1100 S

The BMW R 1100 S has an air-cooled shaft-drive engine, so while the final drive doesn’t need regular attention, the engine does.

There are three oil changes you have to do on the R 1100 S: Engine oil, gearbox oil, and final drive oil. They all have different recommended engine distance intervals, but they do all have a two-year service interval just on changing the fluid.

But the core service interval for the BMW R 1100 S is every 6000 miles or 10000 km, at which point you should change the oil and filter, and do a valve inspection and adjustment as necessary.

At every service, do a full multi-point inspection too. The list of items to inspect is below.

On top of that, make sure you replace the long-term perishables, like the clutch and brake fluid, and even the rubber alternator belt, which if snaps will leave you without a functioning charging system.

What you need to service the BMW R 1100 S

Below is what BMW recommends you need to service the BMW R 1100 S.

PartBMW R 1100 S spec
Engine oilBMW recommends a brand-name oil that covers a number of operating temperatures and that is API SF, SG, or SH (or better) spec. BMW Advantec 15W-50 (recommended for newer bikes) meets this spec.
Oil filterThe Hiflofiltro HF163, a high-quality drop-in replacement, fits the BMW R 1100 S
Spark plugsThe BMW R 1100 S has twin spark plugs per cylinder.
* Primary spark plug: NGK BKR 7 EKC
* Secondary spark plug: NGK DCPR 8 EKC
Clutch / brake fluidUse BMW DOT 4 (though you can use any DOT 4 fluid).
Gearbox oilAPI class GP5 hypoid gear oil, EPX 90 or SAE 90 API, e.g. Castrol 75W-90.
Final drive oilAPI class GP5 hypoid gear oil, EPX 90 or SAE 90 API
(same as Gearbox oil)
Air filterYou can use a BM-1199 air filter from K&N.
Alternator beltThe part number for the alternator belt is 12317681841. This is the same as a Hella 4PK611.
General greaseShell Retinax EP2 or another anti-friction bearing grease, like the more modern Shell Gadus S3
BMW R 1100 S spec maintenance parts

BMW R 1100 S Maintenance Schedule

We adapted these service intervals from the manual, clarifying it and even correcting some typos (e.g. “bake fluid”, c’mon BMW).

There are two kinds of service interval:

  1. The regular inspection checklist, mostly checks and
  2. Longer-term, more major, periodic maintenance

Regular service checklist (Periodic / Annual)

Below is the regular service checklist — just a list of things to check over on the BMW R 1100 S at every check-up.

BMW marks some of them as “annual” checks. But even the ones not marked as annual checks are extremely simple, and there’s no harm doing them annually as well.

ItemAnnual
[Dealer] Read the fault code memory with the BMW diagnostic equipment
[Dealer] (ABS model) Perform bleed test with BMW diagnostic equipment
Check brake fluid level at front and rear
Check clutch fluid level
Examine brake pads and discs for wear, replace if necessary
Check Bowden cable play
Grease the side stand pivot
Check function of side-stand switch
Check tire pressures
Check lights and signals function
Check telltale / warning lights
Check instruments
Check clutch and gear shifter functioning and smooth operation
Check handbrake, foot brake, and steering smooth operation
Perform a test drive
[Dealer] Record service in log book
BMW R 1100 S inspection checklist

Service schedule

Below is the longer service schedule for the BMW R 1100 S, including things to replace like oil and filters.

Notes

  • At the end of the schedule, keep following it in the pattern shown. Most things are every one or two services, but some items have odd intervals, like changing the alternator belt.
  • Some items have a time-based and distance-based interval, like the oil change
  • Note there are three oil/lubricant changes, all with different periods.
mi x 10006121824
km x 100010203040Every
Change the engine oil and filter
Ensure engine is at regular operating temperature
Year. Also, service more often if ridden offen in cold or in start-stop conditions
Change the oil in the gearbox
Ensure engine is at regular operating temperature
2 years
Change the oil in the rear wheel drive
Ensure drive is at regular operating temperature
2 years
Check spark plugs condition
Replace spark plugs
Check/adjust valve clearances
Replace the intake air filter element✓*✓** More often if riding in dusty / dirty conditions
Replace the fuel filter✓** If fuel is of poor quality
Check that the throttle cable moves freely and is free of kinks and abrasion. Replace if necessary
Check throttle body synchronisation. Repair leaks if necessary
Check operation of brake system and freedom from leaks. Repair/replace items if necessary
Change brake fluid (if ABS model, then just in wheel circuit)Year
(ABS model) Change brake fluid in control circuit2 years
(BMW Integral ABS) Perform bleed test with BMW MoDiTeCYear
Change clutch fluid2 years
Check rear wheel bearing play
Check swinging arm bearings (freedom from play), adjust if necessary
Check battery acid level and add distilled water if necessary; clean and grease battery posts
Replace the alternator belt (Poly-V Belt)36000 miles / 60000 km
BMW R 1100 S Service Schedule

About the BMW R 1100 S

BMW R 1100 S Red LHS front left static

The BMW R 1100 S is a bike many have forgotten about, but it has a dedicated fan of followers that know it for its merits.

At its core, the BMW R 1100 S has a lot that’s unique about it. It’s a sport bike, but a comfortable one, without quite being a sport tourer. BMW had other sport tourers in its own lineup, so of that we can be sure.

It has an air-cooled boxer engine, but it’s tuned quite high for decent power. The 1085c boxer twin has a relatively high (for a non-liquid cooled engine) compression ratio of 11.3:1, which helps the R 1100 S get to an impressive peak power figure of 72 kW (97 bhp) at 7500 rpm, helped by the generous peak torque of 97 Nm (72 ft-lb) at 5750 rpm.

While the BMW R 1100 S shares a platform with other BMW motorcycles in the R 1100 class, like the BMW R 1100 GS, the R 1100 S has a more aggressive tune.

Even though the R 1100 S is a little heavy for a sportbike, weighing 229 kg / 505 ft-lb with a full tank of gas, it really moves. You just might have to shift a little more than you would on a modern high-strung four-cylinder sportbike.

The BMW R 1100 S has a BMW Telelever front-end, another distinguishing characteristic for a sport bike. It’s similar to a wishbone-style suspension, with a horizontal fork coming out from the middle of the bike onto moving fork pistons that don’t have any suspension function, and a single suspension strut.

The benefit of a Telelever-style suspension is that it’s anti-dive. The bike’s geometry changes as the piston compresses and the effect is that you don’t pitch forward as you would on a bike with normal forks. The result? Much more stability in corners, and much less clanging of your riding partner’s helmet onto yours as you brake. The downside is that you don’t “feel” corners as much as you would on another bike, so it takes some getting used to.

The BMW R 1100 S also has under-seat exhausts. Coupled with a single-sided swingarm, this makes for a visual feast as you get to look up on that beautiful exposed rear wheel. Few other manufacturers can do this. These days, under-seat exhausts are no longer in vogue, as they’re quite heavy and also make for a hot seat. So only a few manufacturers (like Ducati) can effectively combine the exposed rear wheel and an under-boxy exhaust for similar visual glory.

Modern sport-tourers are often over 100 hp and much higher revving. Plus, they have complications that make owning and servicing them more complex, like advanced controls, suspension, and wiring systems. If you’re after a throwback sporty tourer (well, a sportbike in the day) with accessible power and striking unique looks, there’s not much out there that the R 1100 S compares with — other than its successor, the BMW R 1200 S, even the BMW HP2 Sport.

The BMW R 1100 S also came in some sportier configurations, culminating in the gorgeous and fairly exclusive BoxerCup Replika or BCR.

The BMW R 1100 S BCR has the same underlying framework as the R 1100 S (including the engine in basically the same tune, with the same claimed power/torque), though the BCR comes with a twin Laser under-seat exhaust system, braided brake lines, Öhlins suspension, and a shorter Paralever arm which raised the rear end and increased cornering clearance.

Reference — Manual for the BMW R 1100 S

The above information for the BMW R 1100 S came from the rider’s manuals as well as the maintenance booklet.

Some screenshots for reference are below.

Both of these are (at present) available from the BMW website here.

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