This is the maintenance schedule and associated service intervals for the Suzuki GSX-R750 K4 before the rebuild in 2006 with a different engine (the K6). See the maintenance schedule for the K6-K10 GSX-R if that’s what you’re after.
Since its launch decades ago, the Suzuki GSX-R750 has always had a 749cc inline-four water-cooled 16-valve engine. Along the way there have been a lot of upgrades.
The K4/K5 incarnation of the GSX-R750 is a really popular one — some saying it was the best ever. It’s a refined version of the 00-03 model year Suzuki GSX-R750, but with better braking, more advanced fuelling, and lighter weight.
The engine has the same displacement but produces 110 kW/147 hp (claimed) at the crank, with a redline of 14,500 RPM, specs which the GSX-R750 hasn’t deviated much from. The dry weight of the K4/K5 is just 163 kg (359 lb), making it one of the lightest ever produced.
The engine from the K4-K5 GSX-R750 was used in the GSR750 for many years afterwards.
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Suzuki GSX-R750 models and changes
Here are all the models of GSX-R750 and the major changes over the years. While the maintenance schedule doesn’t change very much between the years, the engine does, as do some of the components like brakes and suspension.
|K4, K5||2004-2005||32-bit ECU (upgraded from 16) and re-tune to make about 10% more power, 110 kW (147 hp)|
Lightweight pistons and titanium valves, allowing higher redline (14,500)
4-piston Tokico brakes
Dry weight of just 163 kg (one of lightest GSX-Rs ever)
20th anniversary edition in 2005 (slightly higher 150hp thanks to new silencer)
|K6, K7, K8, K9, K10||2006-2010||New frame, swing-arm|
New more over-square motor
Higher 12.5:1 compression ratio
Stacked transmission (more compact)
Larger brake rotors (310mm, up from 300mm)
Steel alloy springs and spring retainers added to titanium valves
From 2008 — Power modes
Brembo brake calipers
Showa Big Piston Fork and rear shock
More compact instrument panel
Revised fairings, headlights
Overall wet weight of 194 kg (428 lb)
What you need to service your K4-K5 Suzuki GSX-R750
So you want to service your own Suzuki superbike do you? Good on you!
Apart from some basic motorcycle maintenance tools, here’s what you need to keep your GSX-R750 K4-K5 in perfect condition.
|Part||Suzuki GSX-R K4-K5 spec|
|Oil||Suzuki requires engine oil with JASO MA spec, or at least API SF/SG or SH/SJ spec. Many oils fit this. Suzuki recommends SAE 10W-40 weight Suzuki motor oil, but I wouldn’t over-think this and use another popular high-grade oil like Motul 300V or Motul 7100.|
|Oil filter||Use a Hiflofiltro HF138RC, which is a drop-in high-quality replacement. This is for all GSX-R750s since 1988 by the way.|
|Air filter||Use a K&N air filter as a drop-in replacement, part number SU-7504 (for K4-K5 only)|
|Spark plugs||The standard spark plug is NGK CR9E (and you need 4)|
|Brake fluid/Clutch fluid||Suzuki (like most motorcycles) requires DOT 4 brake and clutch fluid.|
|Brake pads||A popular upgrade are EBC brake pads. For the K4/K5 GSX-R750, you need 2 pairs of FA379HH up front, and one pair of FA254HH at the rear.|
|Coolant||Suzuki only requires a coolant that’s “compatible with an aluminium radiator”. Most motorcycle coolants are, and so a Valvoline Zerex G05 is a fine option.|
|Chain maintenance||Use either Motul chain paste or a complete Motul chain care kit for frequent chain servicing.|
|Grease||Always handy to have some lithium soap-based grease for external pivot points, like the kickstand.|
Suzuki GSX-R750 K4-K5 Maintenance Schedule
Below is the maintenance schedule for the Suzuki GSX-R750 K4-K5.
- I= Inspect and clean, adjust, replace or lubricate as necessary.
- R= Replace
- T= Tighten
NOTE: (California model only) and (CA. only) means that the items or the maintenance interval is to be applied only for the California model.
|Air cleaner element (SU-7504)||–||I||I||R||I|
|Spark plugs (NGK CR9E)||–||I||R||I||R|
|Exhaust control valve||I||I||I||–||I|
|Engine oil (Motul 7100)||R||R||R||R||R|
|Engine oil filter (HF138RC)||R||–||–||R||–|
|Throttle valve synchronization||I|
|Evaporative emission control system (E-33 only)||–||–||I||–||I|
|PAIR (air supply) system||–||–||I||–||I|
|Throttle cable play||I|
|Clutch cable play||–|
|Engine coolant (Zerex G05)||Replace every 2 years.|
|(Motul chain care kit)||Clean and lubricate every 1,000 km (600 miles).|
|Replace every 4 years.|
|Brake fluid (DOT 4 only)||–||I||I||I||I|
|Replace every 2 years.|
|Exhaust pipe bolts and muffler bolt and nut||T||–||T||–||T|
|Chassis bolts and nuts||T||T||T||T||T|
Tyre size and tyre pressure for the Suzuki GSX-R750 K4-K5 (2004-2005)
The manual for the 2005 Suzuki GSX-R750 K4 specifies the following tire sizes and pressures, and recommends the following tyres.
|Wheel||Tire size||Tyre pressure||Recommended tyre|
|Front||120/70 ZR17 M/C 58W||250 kPa / 36 psi||BRIDGESTONE BT014F SJ|
|Rear||180/55 ZR17 M/C 73W||290 kPa / 42 psi||BRIDGESTONE BT014R W|
About the Suzuki GSX-R 750 K5 (2004-2005)
The Suzuki GSX-R750 is a family of 750 cc sports motorcycles from Suzuki’s GSX-R series of motorcycles.
Looking like a Suzuki Endurance racer, the GSX-R 750 was one of the first affordable, modern racer-replica motorcycles suitable for road use. It was introduced at the Cologne Motorcycle Show in October 1984 and has gone through many changes since then.
For the 2004-2005 K5 model there were some important upgrades: new engine internals, chassis, aerodynamic bodywork, longer swing-arm, longer wheelbase, 4-piston brakes (versus the the 6-piston of 1999), 5.5 inch smaller rear rim, shorter and narrower engine. A lot of changes went towards weight savings, particularly in unsprung mass.
The K4-K5 Suzuki GSX-R 750 has a new electronic fuel injection system with double valve rider controlled throttle valve and electronically-controlled valve, increasing torque and power as well as increasing combustion efficiency that contributes to cleaner exhaust emission as well. It’s powered by a 32-bit ECU, which at the time sounded better than it does today.
The new frame is lighter while the swing arm has been lengthened 20 mm and the wheelbase is kept at 1400 mm for better handling and traction control.
Besides changing color on the motorcycle, Suzuki celebrated the 20th anniversary of the model in 2005 by launching the Suzuki 20th Anniversary GSX-R750 K5, which included custom paint, a Yoshimura exhaust, grooved discs, a blue seat, and a plaque on the top yoke. And a blue chain! (They’re probably not blue any more…)
Manual for the Suzuki GSX-R750 K5 (2004-2005)
The above maintenance schedule comes directly from the user’s manual for the Suzuki GSX-R 750 K5 (2004-2005).
You can download it from here.