This is the maintenance schedule and associated service intervals for the Suzuki Boulevard M90.
The Suzuki Boulevard M90 is the “reasonably sized” performance cruiser (reasonable next to the slightly unreasonable Suzuki Boulevard M109R). It hasn’t changed since launch other than in getting more colour schemes, and has always been powered by a liquid-cooled 54-degree fuel-injected 1,462 cc V-twin engine that puts power down through a shaft drive.
Maintaining the M90 is quite like maintaining its cruisier sibling the C90, although there are some spec differences. See below for pics of the M90 and C90 side by side.
This site has links for things like oil and spark plugs from which we earn a commission (which unfortunately nobody can save, not even us). If you appreciate this work, then please use those links. Thanks!
Suzuki Boulevard M90 Maintenance Schedule
Below is the maintenance schedule for the Suzuki Boulevard M90.
Interval: This interval should be judged by number of months or odometer reading, whichever comes first.
- I= Inspect and clean, adjust, replace or lubricate as necessary.
- R= Replace
- T= Tighten
|Air cleaner element||–||I||I||R||I|
|* Exhaust pipe bolts and muffler bolts||T||–||T||–||T|
|* Valve clearance||I||–||I||–||I|
|Spark plugs (NGK CR6E x 4)||–||I||R||I||R|
|* Evaporative emission control system (CA model only)||–||–||I||–||I|
|Engine oil (Synthetic blend 10W-40 e.g. Motul 5100)||R||R||R||R||R|
|Engine oil filter (HF138RC)||R||–||–||R||–|
|Final gear oil (SAE-90 Hypoid oil. Mobil 1 Gear Oil is popular for the M90 and M109R)||R||–||I||–||I|
|Throttle cable play||I||I||I||I||I|
|* PAIR (air supply) system||–||–||I||–||I|
|* Throttle valve synchronization||I|
|* Engine coolant (Suzuki Super Long Life, or equivalent blue coolant e.g. Honda Coolant)||–||–||–||–||R|
|Clutch cable play||–||I||I||I||I|
|Brake hose||Replace every 4 years||–||I||I||I||I|
|Brake fluid (DOT 4 only)||Replace every 2 years||–||I||I||I||I|
|* Front forks||–||–||I||–||I|
|* Rear suspension||–||–||I||–||I|
|* Chassis bolts and nuts||T||T||T||T||T|
|Lubrication (using lithium soap-based grease)||Lubricate every 1,000 km (600 miles)|
Tyre size and tyre pressure for the Suzuki Boulevard M90
The manual for the Suzuki Boulevard specifies the following tyre pressures and stock tyres, plus the following recommended tyre pressures.
|Front||120/70ZR18M/C (59W)||BRIDGESTONE G853 G (Tubeless)||Solo: 250 kPa (2.50 kgf/cm2, 36 psi)|
Two-up: 225 kPa (2.25 kgf/cm2, 33 psi)
|Rear||200/50ZR17M/C (75W)||BRIDGESTONE G852 G (Tubeless)||Solo: 250 kPa (2.50 kgf/cm2, 36 psi)|
Two-up: 280 kPa (2.80 kgf/cm2, 41 psi)
About the Suzuki Boulevard M90
The Boulevard M90 is Suzuki’s “pretty big, but not the biggest” power cruiser.
Suzuki uses a powerful 1,462 cc V-twin to power the M90. It’s the engine you’d expect for a cruiser, but it’s also liquid-cooled and has overhead cams — two modern touches that many American-made cruisers lack. The engine pushes out 132 Nm (97 foot-pounds) of torque very early, giving the M90 Boulevard a lot of pull. And it also has horsepower of… well, it’s less relevant, as cruisers are more about low-end torque than top-end rush.
The Suzuki M90’s engine has two of 42 mm throttle bodies with dual throttle valve technology. This tech means there’s a second throttle valve that the computer opens up at certain times to help with throttle response across the rev range.
Suzuki also has idle speed control to help with idling and cold starts, also while keeping emissions low, keeping the ECU in closed loop mode. Suzuki also has dual plugs in the heads (so yes, you need four spark plugs for this twin!) to keep emissions down and performance up by ensuring complete combustion.
The Suzuki M90 has a low-maintenance shaft-drive system and a five-speed transmission.
The transmission has large flywheels to dampen the power pulses a bit, and the spring-loaded, primary drive gear protects the engine from hard shocks feeding back through the drive system, e.g. during aggressive downshifts.
Suzuki also uses a clutch assist system to give the clutch a lighter pull, letting you control the power with precision and little effort.
Basically, the M90 is the “reasonable power cruiser” that many people will enjoy more than the M109R, if they dare admit it to themselves.
Manual for the Suzuki Boulevard M90
This is a screenshot of the maintenance schedule from the Suzuki Boulevard M90’s manual.
The above maintenance schedule comes directly from the user’s manual for the Suzuki Boulevard M90.
You can download the full manual from here.