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 bhp (claimed) at the crank, with a redline of 14500 RPM, specs from which the GSX-R750 hasn’t deviated much. 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 is also used in the GSR750, released many years afterwards.
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Suzuki GSX-R750 models and changes
Here are all the recent-ish 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.
The service intervals for the GSX-R750 are
- Oil changes every 3500 miles / 6000 km or 12 months. Change the filter every 3rd service.
- Spark plug change every 7500 miles / 12000 km or 24 months
- Valve service every 14500 miles / 24000 km or 4 years
- Change fluids (brake fluid, coolant) on a time basis
- And maintain your chain!
- I= Inspect and clean, adjust, replace or lubricate as necessary.
- R= Replace
- T= Tighten
- The break-in schedule is no longer relevant so it’s not shown.
- At the end of the maintenance schedule, keep following it in the pattern shown, every 1, 2, 3, or 4 services.
|mi x 1000||4||7.5||11||14.5|
|km x 1000||6||12||18||24|
|Engine oil (Motul 7100 10W-40)||R||R||R||R|
|Engine oil filter (HF138RC)||–||–||R||–|
|Air cleaner element (SU-7504)||I||I||R||I|
|Spark plugs (NGK CR9E)||I||R||I||R|
|Exhaust control valve||I||I||–||I|
|Throttle valve synchronization||–||I||–||I|
|Evaporative emission control system (if fitted)||–||I||–||I|
|PAIR (air supply) system||–||I||–||I|
|Throttle cable play|
|Clutch cable play|
|Engine coolant (Zerex G05)||Replace every 2 years.|
|Brake hoses||I||I||I||I||Replace every 4 years.|
|Brake fluid (Castrol DOT 4)||I||I||I||I||Replace every 2 years.|
|Exhaust pipe bolts and muffler bolt and nut||–||T||–||T|
|Chassis bolts and nuts||T||T||T||T|
Maintaining your Chain on your Suzuki GSX-R750
Maintain your chain regularly. Either use a good-quality (and affordable) chain lube like Motul Chain Paste, or use a full on Motul Chain Care Kit to clean and restore a chain.
Suzuki recommends that you maintain your chain regularly according to the following schedule.
|Chain maintenance item||Every|
* Correct tension / slack (20-30mm / 0.8-1.2 in at loosest point)
* Adequate lubrication
* No excessive wear / damage
|Ride (pre-ride check)|
|Clean and lubricate chain||1000 km / 600 miles|
Damage includes loose pins, damaged rollers, dry or rusted links, kinked or binding links, excessive wear, and improper adjustment.
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 Bridgestone sport tires (BT014, Bridgestone Battlax sport-touring tyres).
|Wheel||Tire size||Tyre pressure|
|Front||120/70 ZR17 M/C 58W||2.5 bar / 250 kPa / 36 psi|
|Rear||180/55 ZR17 M/C 73W||2.9 bar / 290 kPa / 42 psi|
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. They have been around for decades — Suzuki first introduced the GSX-R750 in October 1984, and it has gone through many changes since then.
The general ethos of the Suzuki GSX-R750 has always been to be a road-going race replica. Many of the early GSX-R750s were styled after Suzuki Endurance racers.
For the 2004 model year, Suzuki made a number of important changes to the engine, chassis, singarm, and braking — a total design overhaul.
Firstly, the engine. Suzuki introduced fuel injection to the K4 GSX-R750. It has a double throttle valve — a rider-controlled valve and an electronically controlled valve. Fuel injection is via a 32-bit ECU, very high-tech, allowing for more rapid response to changing inputs.
The goals of the fuel injection system were to make for cleaner and more efficient combustion, but also to increase overall torque and power. These days, fuel injection also means it’s easier to fine tune your motorcycle’s response to modified intakes and exhausts.
In terms of power, the fuel-injected K4 GSX-R750 makes 107 kW (145 bhp) at 12800 rpm, and peak torque of 86 Nm (64 ft-lb) at 11200 rpm. So, like later versions of the GSX-R750, it’s a high-revving sportbike that makes most of its power up high.
Suzuki also upgraded the front brakes to lighter Tokico four-piston caliper units vs the older six-piston calipers. They grip 300mm discs.
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! (Though after this many years the chain is probably not blue any more…)
Manual for the Suzuki GSX-R750 K4 (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 Suzuki manuals from here.