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Suzuki GSX-R1000 K5-K8 (2005-2008) Maintenance Schedule and Service Intervals

2008 Black Suzuki GSX-R1000

This is the maintenance schedule and associated service intervals for the Suzuki GSX-R1000 K5, the engine of which was carried over to K8 in 2008. In 2009, Suzuki released their 2009 GSX-R1000 K9, which kept the same basic engine until 2016.

The Suzuki GSX-R1000 is a sport bike from Suzuki’s GSX-R series of motorcycles. It was introduced in 2001 to replace the GSX-R1100 and is powered by a liquid-cooled 988 cc inline four-cylinder, fuel-injected engine.

The K5 Suzuki GSX-R1000, the so-called “fifth-gen” GSX-R1000, was a major revamp of the already revolutionary K1-K4 GSX-R1000. But the K5 engine is iconic. The new engine produced 131 kW @ 11,000 rpm and peak torque of 118 Nm at 8,500 rpm. Later in life, emissions standards meant that the GSX-R1000 peaked in torque at higher and higher RPM — e.g. the 2017 GSX-R1000 hits max torque of 117Nm at 10,800 rpm. So the earlier K5 engine is one of the gruntiest, which is why you see it in motorcycles like the GSX-S1000 and the Katana of today.

Suzuki changed the motorcycle’s tuning and a couple of parts in 2007. Overall the motorcycle was heavier due to a more restrictive exhaust and needed to be revved higher to reach its peak torque (and higher peak power). But fundamentally the engine is the same.

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What you need to service the K5-K8 Suzuki GSX-R1000

So you’re maintaining your original classic Suzuki K5 Gixxer eh? Awesome!

Here are the parts you’ll need — these are the specific part codes for the Suzuki GSX-R1000 K5-K8 models.

PartSuzuki GSX-R1000 K5-K8 spec
OilSuzuki 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 filterUse a Hiflofiltro HF138RC, which is a drop-in high-quality replacement. This is used on all GSX-R1000 models (yes, even up to 2021).
Air filterUse a K&N air filter as a drop-in replacement, part number SU-1005 for K1-K4 models.
Spark plugsThe standard spark plug is NGK CR9E (works for most people most of the time). Some replace them with iridium CR9EIX plugs.
GSX-R1000 K5 spark plug
Brake fluidSuzuki (like most motorcycles) requires DOT 4 brake fluid (the K5-K8 had a cable-actuated clutch).
Brake padsMost people upgrade their brake pads to EBC ones for better performance (and they’re very affordable). Use EBC part codes (for the 2005-2008 model years).
* Front: FA379HH for the front
* Rear 05-06: FA254HH
* Rear 07-08: FA419HH
GSX-R1000 EBC brake pads
CoolantSuzuki 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 maintenanceUse either Motul chain paste or a complete Motul chain care kit for frequent chain servicing.
GreaseAlways handy to have some lithium soap-based grease for external pivot points, like the kickstand.
Suzuki GSX-R1000 K5-K8 maintenance parts

Suzuki GSX-R1000 K5-K8 (2005-2008) Maintenance Schedule

Below is the maintenance schedule for the Suzuki GSX-R1000 K5-K8.

Maintaining the original GSX-R1000 K5-K8 is much like maintaining any other sportbike. Service the chain and change the oil regularly, Change the fluids (brake, clutch, cooling) every 4 years, and remember to re-torque and lubricate external pivot points with grease.

NOTE:

  • I= Inspect and clean, adjust, replace or lubricate as necessary.
  • R= Replace
  • T= Tighten
  • More frequent servicing may be required on motorcycles that are used under severe conditions
miles6004,0007,50011,00014,500
km10006,00012,00018,00024,000
Itemmonths16121824
Air cleaner elementIIRI
Spark plugs (NGK CR9E)IRIR
Valve clearanceI
Exhaust valveIII
Engine oil (Motul 7100)RRR
Engine oil filter (HF138RC)RR
Fuel lineIIII
Idle speedIIIII
Throttle valve synchronizationI (CA)II
Evaporative emission control system (CA only)II
PAIR (air supply) systemReplace vapor hose every 4 years.
Throttle cable playII
Clutch cable playIIIII
Radiator hosesReplace every 4 years.IIII
Engine coolant (Ethylene Glycol Pre-mix)Replace every 2 years.
Drive Chain (Motul chain paste)Clean and lubricate every 1,000 km (600 miles)IIIII
BrakesIIIII
Brake hosesReplace every 4 years.IIII
Brake fluid (DOT 4 only)Replace every 2 yearsIIII
TiresIIII
SteeringIII
Front forksII
Rear suspensionII
Exhaust pipe bolts and muffler bolt and nutTTT
Chassis bolts and nutsTTTTT
Suzuki GSX-R1000 K5-K8 maintenance schedule

Tyre size and tyre pressure for the Suzuki GSX-R1000 K5-K8

The manual for the Suzuki GSX-R1000 recommends the following tyre sizes and pressures. Of course, people choose their own tyres these days.

TyreSizeTyre pressure (cold)Brand(s) shipped with
Front120/70 ZR17 M/C 58W250 kPa (2.50 kgf/cm2)/ 36 psiBRIDGESTONE: BT014F F
Rear190/50 ZR 17 M/C 73 W290 kPa (2.90 kgf/cm2)/ 42 psiBRIDGESTONE: BT014R
Tyres and tyre pressures for the Suzuki GSX-R1000 K5-K8

It’s the same as for other years, though the tyres that the K5-K8 shipped with were a bit different.

About the Suzuki GSX-R1000 K5-K8 (2005-2008)

The original GSX-R1000 was a huge improvement on the outgoing GSX-R1100 and an improvement on the GSX-R750 of the time. Even though it had a lot more power, the original K1 GSX-R1000 was only 4 kg (9 lb) heavier than its smaller 750 brother.

The K5 GSX-R1000 was a major overhaul of the GSX-R, starting with the motor. And what a motor! They enlarged the bore, increased the compression, and also upped the power.

Unfortunately, while Suzuki kept the engine the same, they had to tune the K7-K8 GSX-R1000’s engine differently to comply with emissions regulations. The result was a motorcycle that was more powerful, but peakier, lacking the broad torque curve — and lighter weight, by the way — of the earlier K5-K6.

In fact, it’s easiest to see on a table.

DimensionK1-K4 GSX-R1000K5-K6 GSX-R1000K7-K8 GSX-R1000
Bore/Stroke73mm x 59mm74.3mm x 59mm74.3mm x 59mm
Compression12.0:112.5:112.5:1
Displacement987.7cc998.6cc998.6cc
Peak power120 kW @ 10,800 rpm131 kW @ 11,000 rpm138 kW @ 12,000 rpm
Peak torque120 Nm @ 8,500 rpm118 Nm @ 8,500rpm117 Nm @ 10,000rpm
Comparing the K1-K4, K5-K6, and K7-K8 GSX-R1000 engine power outputs

The K5-K8 GSX-R1000’s engine also gained titanium valves (steel on the K1-K4) with heavier springs that let the engine rev 1000rpm higher. The engine also has larger intake and exhaust ports.

One of the most significant changes to the K5 engine is the addition of a back-torque limiting, or “slipper” clutch, and closer gear ratios. Second gear remains the same as the K1-K4 but first is taller and third through sixth much closer and more suited to the fast-revving engine than before. This lets you shift through the gears more aggressively after launching.

The slipper clutch lets you downshift without needing to manually slip the clutch, which makes for better corner entry.

Suzuki kept the same 32-bit computer from the 2003 model for the K5, though of course re-mapped the engine. Suzuki did however add another injector per cylinder, and also increased throttle body size to 44mm.

In 2007, Suzuki upgraded the K5-K6 GSX-R1000. The engine remained teh same, but some retuning was necessary so that it would comply with emissions regulations. This meant it was 6.4kg (14 lb) heavier from teh new exhaust system. Suzuki countered this by revising the aerodynamics and increasing the horsepower for the engine through tuning — though at some cost, as the torque and horsepower both took longer to develop.

Suzuki also added a mode selector on the 2007 model, allowing power modes A through C. A is unrestricted, B is reduced power until 50% throttle is applied, and C is reduced power throughout the rev range. People on forums call this a “chicken switch” and debate its usefulness… though it probably comes in handy in the rain.

Manual for the Suzuki GSX-R1000 K5-K8

The above maintenance schedule comes directly from the user’s manual for the Suzuki GSX-R1000 2005 (the K5).

Suzuki GSX-R1000 K5 maintenance schedule screenshot from manual

You can download the manual from here.

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