This is the maintenance schedule and associated service intervals for the Suzuki Boulevard S40, a.k.a the “Savage”, or the LS650.
The Suzuki Boulevard S40 (formerly Suzuki LS650 Savage) is a lightweight cruiser motorcycle with a single-cylinder engine. It was called the Savage from 1986 to 2004, and renamed as the Boulevard S40 from 2005.
The Suzuki LS650 has remained unchanged except for minor cosmetic improvements, receiving a 5 rather than 4 speed transmission in 1993. It has always been a simple motorcycle — easy to ride, modest power, and an extremely easy-to-service single-cylinder engine that’s in plain sight.
With a weight of 381 lb (173 kg), Suzuki markets the S40 as “an entry-level model to the cruiser line.” With a seat height of 28 inches and flatter handlebar, the bike is also suitable for shorter riders.
The humble “Savage” has unfortunately been retired from nearly all markets, though you can still get it in the USA — for now (2022). So take care of yours if you have one!
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Suzuki Boulevard S40 / LS650 “Savage” Maintenance Schedule
Below is the maintenance schedule for the Suzuki Boulevard S40 / LS650 “Savage”
- Follow the earlier of distance- or time-based intervals.
- At the end of the maintenance schedule, continue it in the pattern shown.
- I= Inspect and clean, adjust, replace or lubricate as necessary
- R= Replace
- T= Tighten
|mi x 1000||0.6||4||7.5||11||14.5|
|km x 1000||1||6||12||18||24|
|Engine oil (Kawasaki 10W-40 Engine Oil)||R||R||R||R||R|
|Oil filter (HFA3608)||R||R||R||R||R|
|Drive belt||Inspect every 2000 mi / 3000 km|
|Battery (Specific gravity of electrolyte)||–||I||I||I||I|
|Air filter (K&N SU-6595)||–||–||R||–||R||Clean every 2000 mi / 3000 km|
|Spark plugs (NGK DPR8EA-9)||–||I||R||I||R|
|Vapor hose (California model only)||Replace every 4 years|
|Automatic decompression cable||I||I||I||I||I|
|Throttle cable play||I||I||I||I||I|
|Clutch (Lubricate cable — Protect All Cable Life)||I||I||I||I||I|
|Brakes (front disc, rear drum)||I||I||I||I||I|
|Brake hose||I||I||I||I||I||Replace every 4 years|
|Brake fluid (Castrol DOT 4)||I||I||I||I||I||Replace every 2 years|
|Chassis bolts and nuts||T||T||T||T||T|
|Cylinder head nuts, exhaust pipe bolts and muffler connector bolt||T||T||T||T||T|
|General lubrication||Lubricate every 600 mi (1000 km)|
Tyre size and tyre pressure for the Suzuki Boulevard S40
The manual specifies these tyre sizes and says the S40 ships with these tyres standard. It also recommends the following tyre pressures when cold.
The Boulevard S40 has tubed tyres.
|Front||100/90-19M/C 57H||IRC GS-18F||200 kPa (29 psi)|
|Rear||140/80-15M/C 67H||IRC GS-18R||Solo-dual: 225-250 kPa (33-36 psi)|
About the Suzuki Boulevard S40
The Suzuki Boulevard S40, formerly known as the LS650 Savage, is a simple and stylish motorcycle by Suzuki.
The Boulevard S40 is powered by a square 652 cc engine. It has a bore and stroke of 94 mm, which is why it’s called “square” (though obviously it’s a cylindrical shape).
The engine is tuned very mildly, with an 8.5:1 compression ratio. This is not a high-performance bike!
Bear in mind that even though the Boulevard S40 and Suzuki DR650 both seem to have long-running air-cooled motors, they’re different. The DR650’s is oversquare, for example.
The engine is very simple in design, with a single Mikuni BS40 carburettor, air cooling, a single overhead cam with two lobes — one for intake and one for exhaust. So adjusting the valves is not overly complex. See this thread on suzukisavage.com for more info.
Even though the valve inspection interval is with every oil change, many owners never do it until they notice valve tappet noise or suffering performance.
What’s very interesting is that the Suzuki Boulevard S40 is still being produced with a single carburettor, a Mikuni BS40 CV carb, just like back in 1986. If you’re looking for a motorcycle to learn how to service a carburettor on — this is one!
Suspension on the Suzuki Boulevard is very simple, with a telescopic fork up front and a single shock at the rear. There’s a disc brake up front and a drum brake at the rear. It’s all so moderately spec’d that it’s silly to mention it, as you don’t buy or ride the Suzuki Boulevard S40 on specs. Just bear in mind you’ll have to replace brake drums at some reason.
Service intervals on the Suzuki Boulevard S40 are as you’d expect for an air-cooled single. Change the oil every 3500 miles or 6000 km, and inspect the valve clearances at that point too (if you want). Replace the spark plug every second service.
While both the Boulevard S40
Manual for the Suzuki Boulevard S40
The above maintenance schedule comes directly from the user’s manual for the Suzuki Boulevard S40.
You can download it from here.