Suzuki Boulevard S40 Maintenance Schedule and Service Intervals

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”

Notes:

  • Follow the earlier of distance- or time-based intervals.
  • At the end of the maintenance schedule, continue it in the pattern shown.
  • Legend:
    • I= Inspect and clean, adjust, replace or lubricate as necessary
    • R= Replace
    • T= Tighten
mi x 10000.647.51114.5
km x 100016121824
months212243648Every
Engine oil (Kawasaki 10W-40 Engine Oil)RRRRR
Oil filter (HFA3608)RRRRR
Drive beltInspect every 2000 mi / 3000 km
Battery (Specific gravity of electrolyte)IIII
Air filter (K&N SU-6595)RRClean every 2000 mi / 3000 km
Valve clearanceIIIII
Spark plugs (NGK DPR8EA-9)IRIR
Fuel hoseIIIII
Vapor hose (California model only)Replace every 4 years
Automatic decompression cableIIIII
Throttle cable playIIIII
Idle speedIIIII
Clutch (Lubricate cable — Protect All Cable Life)IIIII
Brakes (front disc, rear drum)IIIII
Brake hoseIIIIIReplace every 4 years
Brake fluid (Castrol DOT 4)IIIIIReplace every 2 years
TiresIIIII
SteeringIIIII
Front forksIII
Rear suspensionIII
Chassis bolts and nutsTTTTT
Cylinder head nuts, exhaust pipe bolts and muffler connector boltTTTTT
General lubricationLubricate every 600 mi (1000 km)
Suzuki Boulevard S40 maintenance schedule

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.

TyreSizeBrand(s)Tyre pressure
Front100/90-19M/C 57HIRC GS-18F200 kPa (29 psi)
Rear140/80-15M/C 67HIRC GS-18RSolo-dual: 225-250 kPa (33-36 psi)
Tyres and tyre pressures for the Suzuki Boulevard S40

About the Suzuki Boulevard S40

Suzuki Boulevard S40 LS650 Savage white outside cafe

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.

Suzuki Boulevard S40 Maintenance Schedule Screenshot From Manual

You can download it from here.

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