Suzuki Boulevard C109R Maintenance Schedule and Service Intervals

This is the maintenance schedule and associated service intervals for the Suzuki Boulevard C109R, a.k.a. the C1800R in Europe.

The Suzuki Boulevard C109R motorcycle was introduced in 2008 as Suzuki’s big-bore V-Twin cruiser. It’s very similar to the muscle bike of fame, the Suzuki Boulevard M109R.

The core of the Boulevard C109R is fundamentally the same 1786 cc / 109 c.i. liquid-cooled 54-degree V-twin. Suzuki made some internal changes to the motor, increasing crankshaft weight for more stable throttle, and revising the intake profile, focusing on midrange power rather than a high top-end.

The C109RT is the touring version of the C109R. It has a windshield, an attractive studded seat, leather saddlebags, and a comfortable passenger backrest, and also ample chrome on the exhaust, intake cover, front fork, and mirrors.

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Suzuki Boulevard C109R Maintenance Schedule

Below is the maintenance schedule for the Suzuki Boulevard C109R.

Maintaining the C109R isn’t a terribly intimidating affair — other than the size and weight of the thing. But it’s a water-cooled V-twin with a shaft-drive, so core maintenance is oil changes and… maybe change the gear oil every now and then. Other than that, you can leave the major services to the pros, or if you have the space, get access to the twin heads for a valve service.


  • I= Inspect and clean, adjust, replace or lubricate as necessary.
  • R= Replace
  • T= Tighten


  • If you ride your C109 in harsh conditions (e.g. in very cold weather, in dirty/dusty conditions, or in the rain), you may need to service it more frequently.
  • The break-in schedule is no longer shown.
mi x 100047.51114.5
km x 10006121824
Engine oil (Motul 7100 10W-40)RRRR
Engine oil filter (HF138RC)R
Air cleaner element (GMan Dual Performance)IIRI
Spark plugs (NGK CR7EK or CR7EIX iridium)IRIR
Valve clearanceI
Exhaust pipe bolts and muffler boltsTT
Exhaust control valveII
Fuel lineIIII
Evaporative emission control system (CA only)II
Final gear oil (Lucas Oil 80W-90)II
Throttle cable playIIII
PAIR (air supply) systemII
Throttle valve synchronizationII
Engine coolant (Ethylene glycol pre-mix)Replace every 2 years
Radiator hoseIIII
Clutch cable playIIII
Brake hosesIIIIReplace every 4 years
Brake fluid (Castrol DOT 4)IIIIReplace every 2 years
Front forksII
Rear suspensionII
Chassis bolts and nutsTTTT
Suzuki Boulevard C109R Maintenance Schedule

Tyre size and tyre pressure for the Suzuki Boulevard C109R

The manual for the Suzuki Boulevard C109R specifies the following tyre sizes and recommended pressures.

WheelTyre sizeTyre pressure
Front130/70R18M/C 63V250 kPa (2.50 kgf/cm2, 36 psi)
Rear240/40R18M/C 79V290 kPa (2.90 kgf/cm2) 42 psi)
Suzuki Boulevard C109R tyre sizes and pressures

Stock, the C109R ships with Dunlop D221 tyres, but you can fit whatever you want, from cruiser tires to race slicks (don’t use race slicks…)

About the Suzuki Boulevard C109R

The Suzuki C109R is the relaxed, cruiser alternative to the big, bad muscle cruiser that’s the M109R. But the C109R is still pretty bad-ass.

Suzuki engineers took the motor from the M109R and retuned the camshafts for more low-end and mid-range torque over horsepower. They also gave it a heavier crankshaft (giving it 15% more inertia), which makes the throttle on the C109R more steady.

The 1783 cc liquid-cooled DOHC 54-degree V-Twin makes 85 kW (114 hp) vs the M109R’s 93 kW (125 hp), but top-end power is not what this bike is about (nor the M109R anyway; it’s just a consequence of its massive pull!)

The C109R and especially the C109RT are more about power cruising long distances. The ergonomics are more touring-friendly, with higher bars and a more comfortable seat, plus floorboards. The result is a rider triangle that’s much more neutral than on the M109R. You’re sitting more upright and your knees are at a pleasant angle rather than way out in front of you.

Suzuki C109R vs M109R riding position screenshot
Suzuki C109R vs M109R riding position. Source: Suzuki press doc

But the Suzuki Boulevard C109R is still a top-spec motorcycle, with GSX-R-derivced fuel injection, a wide-ratio five-speed transmission, and Showa suspension on both ends.

Suzuki also implemented combined braking on the C109R to help bring the 380 kg (838 lb) to a standstill.

The front brake uses a pin-slide caliper with three pistons. When you use the front brake only, it applies pressure to two of the front brake pistons, plus the rear brake via a connecting line. Then when you use the rear brake pedal, it activates the rear brake of course, while also activating the third piston at the front.

The touring model, the Boulevard C109RT, is a very comfortable bike. It has a tall windscreen and passenger backrest, plus lots of carrying capacity via a pair of leather saddlebags.

Manual for the Suzuki Boulevard C109R

Suzuki Boulevard C109R Maintenance Schedule Screenshot From Manual

The above maintenance schedule comes directly from the user’s manual for the Suzuki Boulevard C109R.

You can download Suzuki manuals from here.

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