Suzuki GSX-R750 K4/5 (2004-2005): Review & Buying Guide

Jon Urry
By Jon Urry
Experienced road tester, bike hoarder and all-round top bloke.


Why you want it:

There was a time when the GSX-R750 was the firm’s most popular sportsbike simply because all the clichés about the useable power of a litre bike combined with the chassis of a supersport bike were absolutely true. However nowadays the advent of electronic assists mean that where back in the 2000s you were always a little cautious about giving a litre bike a big handful, and as a result the GSX-R750 justified its existence as a popular alternative, with traction control helping you stay rubber side down this is no longer a factor. But every now and then it is a delight to ride a bike that actually requires a degree of rider skill with the throttle – and that’s where the GSX-R750 K4/5 steps forward…

Viewed by many as the quintessential GSX-R750 generation, the K4/5 is a beautiful machine to ride if you want a bike that is involving, yet not too frantic or rev-happy. Thanks to its 150cc advantage of over the GSX-R600, the GSX-R750’s inline four engine has a really lovely spread of torque that allows you to drive out of bends without too much need to shift through the gears and then when upright it delivers a surging top-end rush that is true GSX-R in both its feeling and sound. There are few bikes as easy to ride fast or as naturally balanced as the GSX-R750 K4/5 and when you start to push on it just gets better and better.

Sharing an almost identical chassis to the GSX-R600 (the 750 has uprated forks) the K4/5 is a joy on fast roads or better still a track. Wonderfully balanced yet more than happy to hit an apex with pinpoint accuracy, the GSX-R750 is a delight when you are pushing on and is one of those bikes that seems to work with the rider, rather than fight against them. If you want a rapid and smooth road ride, look no further and for learning your track craft there are few better alternatives. However the best part about this particular generation of GSX-R750 is its price tag.

Easily available for less than £4,000, the GSX-R750 K4/5 is an absolute bargain of a sportsbike. Fast enough to thrill but refined enough to stop short of intimidating you, it’s just a brilliant bike for anyone who wants to enjoy the analogue delights of a mid-2000s sportsbike.



What to look for:

Although generally mechanically reliable, Suzukis have a fairly poor track record when it comes to general wear and tear and the GSX-R750 K4/5 is no exception. The first port of call is the finish, which gives you a really good clue as to if the bike has been well maintained or thrashed and ridden in all conditions. The quality of fasteners is very poor and that means they corrode and dull at the first sign of winter salt or a lack of care, so inspect all the shiny areas and that should tell you all you need to know. If the bike appears well cared for, you are onto a winner so start delving into the mechanicals…

During the update from K2/3 to K4/5 the GSX-R750 gained dual-barrel throttle bodies and these have a reputation for Throttle Position Sensors (TPS) issues. If the bike refuses to tickover smoothly or there is a warning light on the dash, assume this has broken and you will need to fork out roughly £200 to get it fixed. If taken on track (a lot are) the 300mm discs have a habit of warping, especially when the pads are swapped for high friction aftermarket items, and the Tokico calipers’ pistons also like to stick. Get the front up in the air and listen for any sound of a pad dragging while also feeling for a pulsing on a test ride that hints at a warped disc. A caliper rebuilt kit is roughly £30, so not too drastic, and usually all they need is a good clean up however replacement discs are closer to £300. Some owners claim the wheels are a touch soft and prone to dings, so check they are straight and true, and also ensure the underslung rear caliper isn’t seized solid as it is in the direct line of fire for road grime.

Major engine issues are very rare on the GSX-R750. It Is a noisy motor as standard, especially on start-up, but if the noise persists be a little wary. A few owners report cam chain issues, but generally your major worry is the gearbox, which isn’t very robust. Ensure it goes through the gears slickly (it is a beautiful gearbox and very precise, well it should be!) and that the clutch is nice and smooth. If it isn’t assume the worm drive (the point it goes into the engine’s cases) is all gunked up and needs a good clean out.


Suzuki GSX-R750 K4/5 (2004-2005): Review & Buying Guide


Any updates?

The K4/K5 is a progression of the GSX-R750 K2/3 and it gained titanium valves in its engine, altered ports and ventilation holes in the upper crankcases alongside a host of technical updates that saw both power and torque boosted in the upgrade. On the chassis front the K4/5 brought radial brakes to the party alongside smaller diameter discs, a revised chassis and a new look. So it was quite a hefty update and far more than just a facelift. In 2006 the GSX-R750 was completely revised to the ‘stubby’ model with its low slung exhaust pipe and far more aggressive look. This is a total revision model and shares very few components with the K4/5 and as a result is reviver and far more track-focused than the relaxed outgoing generation.


Suzuki GSX-R750 K4/5 (2004-2005): Review & Buying Guide


What to pay for a Suzuki GSX-R750 K4/5 (2004-2005):

Despite being an excellent road bike, this generation of GSX-R750 is less popular than the updated ‘stubby’ model due to its rather old-school looks and as such is remarkably good value for money. A budget of £3,000 will easily secure you a 2004 bike with 20,000 miles on its clocks while £3,800 buys you one that has covered closer to 10,000 miles. If you want a K5 model, you need to start with £4,000 in your pocket and a top limit of £5,000. Sellers will try and get a premium for the Anniversary K5, but it isn’t worth much more than a few hundred quid as they are relatively common and if the truth be told not that collectable. Yet!


Suzuki GSX-R750 K4/5 (2004-2005): Review & Buying Guide


Who to ask:

It’s a GSX-R750 and therefore there are loads of enthusiasts out there and a stack of forums and Facebook pages. The forum is very active while there is a GSX-R owners club at and covers what its name suggests! When it comes to tuning or modifying, give Crescent Suzuki a shout as this bike is bang in their racing era. Well, before they went to Yamaha!


Suzuki GSX-R750 K4/5 (2004-2005) Specification:

Used price

From £3,000-£5,000



Bore x Stroke

72 x 46mm

Engine layout

Inline four

Engine details

Liquid-cooled, 16v, DOHC


145bhp (106.6kW) @ 12,800rpm


64lb-ft (86.3Nm) @ 11,200rpm

Top speed

170mph (est)


6 speed, chain final drive

Average fuel consumption

38mpg (est)

Tank size

17 litres

Max range to empty (theoretical)

145 miles

Reserve capacity

30 miles


Aluminium twin spar

Front suspension

43mm Showa usd forks

Front suspension adjustment

Fully adjustable

Rear suspension

Showa monoshock

Rear suspension adjustment

Fully adjustable

Front brake

2 x 300mm discs, four-piston radial Tokico calipers.

Rear brake

220mm disc, two-piston caliper

Front tyre

120/70 – ZR17

Rear tyre

180/55 – ZR17




2075mm x 715mm 1145mm (LxWxH)



Ground clearance


Seat height


Dry weight



To insure this bike, click here

To learn more about what the spec sheet means, click here for our glossary


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