Kawasaki ZX6R G Ninja Specs and Info (1998 to 2000)

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1999 Kawasaki ZX-6R G Ninja

Kawasaki ZX6R Ninja Specs (G1/G2 models – 1998 to 2000)…..

The Kawasaki ZX6-R Ninja (G1 and G2 models) was a fully faired sports bike produced in the UK in the UK between 1998 and early 2000. The ZX-6R G was a major revamp of the previous ZX6R F Ninja model with increased BHP (up to 106 bhp from 100), new front forks, shorter wheelbase, 6kg lighter, digital dash readouts for the water temp, trip and clock and other modifications.

The ZX6R G model only ran for a few years and was replaced in 2000 by the ZX6R J Ninja

Servicing your bike? You’ll need a ZX6R workshop manual…

Basic model info…

Manufacturer: Kawasaki
Model: ZX6R G
CC: 599cc
Engine type: Inline 4 cylinder (4 stroke)
Years in production: 1998 to 2000
Kawasaki model code: ZX600G
Style of bike: Sports bike (fully faired)
Previous model: ZX6R F Ninja
Replaced by: ZX6R J Ninja
Insurance: Group 14 (of 17) – Get a competitive insurance quote from Confused.com

Looking for ZX6R Ninja parts? Buy ZX6R Ninja spares on Amazon…

A little bit about the Kawasaki ZX6-R G Ninja…

Models and years (in the UK)

ZX-6R Ninja G1 (March 1998 to October 1998)…
Model: ZX600-G1
Frame number started:
Description: 599cc Sports bike updated from the previous ZX6R F model with new, 46mm cartridge style from forks, shorter wheelbase, revised steering geometry, bolt on rear subframe, uprated engine, carbs and airbox (producing a claimed 106bhp over the F models 100bhp), 6 piston front brake calipers, digital LCD displays for the mileometer, trip meter, water temperature and clock and a new rear fairing and rear light.
Available colours: Ebony/grey, ebony/red and green/purple
Cost new: £7250 (R and S reg models)
ZX-6R Ninja G2 (November 1998 to January 2000)…
Model: ZX600-G2
Frame number started: JKAZX600GGA024001—-
Description: Same as above model but now has ZX6R logo on the belly pan.
Available colours: Ebony/grey, red/grey and green/purple/grey
Cost new: £5995 for an S or T reg model
£6195 for a V reg model

ZX6R G exhaust

ZX6R G1/G2 Ninja aftermarket exhaust headers.

Engine and gearbox stuff…
Displacement: 599 cc (36.55 cubic inches)
Engine type: Inline four cylinder, four-stroke
Number of cylinders: 4
Cylinder firing order: 1 – 2 – 4 – 3
Compression ratio: 11:8
Bore and stroke: 66.0 x 43.8mm
Cylinder compression: 950 to 1450 kpa/td>
Power: 108.00 HP (79.4 kw) @ 12000 RPM
Torque: 65.7 Nm (6.7 kgf-m or 48 ft.lbs) @ 10000 RPM
1/4 Mile time: 10.9 seconds

Note: 1/4 Mile time is how long it takes to travel a 1/4 mile from a stationary start.

Top speed: 163 mph….Ish! (262.3 km/h)

Note: All top speed, 0-60 times etc are CLAIMED!!!. This means they are based on Kawasaki’s marketing stuff and other sources (it’s not uncommon for manufacturers to bias these figures to help boost sales!)

Clearance between piston ring and cylinder bore: 0.040mm (when new) to 0.072mm (max clearance)
Valves per cylinder: 4 (16 valves in total)
Inlet valve clearance (with cold engine): 0.11mm to 0.19mm
Exhaust valve clearance (with cold engine): 0.22mm to 0.31mm
Cam shafts: Double overhead cams (DOHC)
Fuel type: Petrol (unleaded petrol – 95/4 grade, e.g. petrol from your local garage)
Engine oil capacity: 3.6 litres
Oil pressure: 1.2 to 1.8 bar
Oil system: Forced lubrication (oil pump) from an oil sump with oil cooler
Recommended engine oil: 10w40 Semi synthetic

Note: You can use any grade oil in the ZX6R engine (mineral, semi synthetic or full synthetic). Although fully synthetic is the best and will offer the best protection for your engine, we normally recommend a semi synth as it’s a good balance between engine protection and price. More info…

Engine oil filter capacity: 0.2 litres
Oil filter: Hiflo HF303 / Champion F306
Oil change interval: 5000km or 12 months
Cooling system: Liquid cooled
Cooling system capacity: 2.3 litres
Cooling system change interval: Change every 30,000km or 24 months
Gearbox: 6 speed (1st gear down, 2 to 6 gears up. Neutral between 1st and 2nd gear)
Clutch: Wet, multi plate type clutch
Clutch part no: EBC CK4503 (plates) and EBC CSK56 (springs)

Note: You’ll need a clutch holding tool for removing it, a clutch lever if you’ve dropped it and possibly a clutch cable if it’s suddenly stopped working!

Final drive stuff…
Final drive: chain
Chain length: 108 links
Chain pitch: 525
Free play: 35 to 45mm
Front sprocket: 15 teeth
Rear sprocket: 40 teeth
Fuel and carb stuff…
Fuel type: Petrol (unleaded petrol – 95/4 grade, e.g. petrol from your local garage)
Recommended fuel: 4 stroke / 95 octane
Carb: Mikuni BDSR 36R (x 4)
Idle speed: 1300rpm (+/- 50rpm)

ZX6R Ninja side view

Kawasaki ZX6R G Ninja side view.

Suspension, brakes and wheel stuff…
Front brakes: Twin (dual) 300mm discs
Front brake caliper: Tokico 6 pot caliper
Front caliper bolt torque: 34nm
Front disc part numbers: EBC MD4136X (x2, left and right disc)
Front brake pad part number: EBC FA188
Upgrade front brake pad part number: EBC EPFA188HH (sintered brake pads)

Sintered brake pads are made using heat and pressure to fuse metal particles in the pads together which makes them very resistant to friction (friction causes the brakes to overheat which leads to brake fade in extreem cases). This gives better braking but they can be alot noisier then normal pads.

Rear brake: Single 220mm disc
Rear brake caliper: Tokico 1 (single) pot caliper
Rear caliper bolt torque: 25nm
Rear disc part number: EBC MD4138
Rear brake pad part number: EBC FA192
Recommended brake fluid: DOT 4 brake fluid
Brake fluid change interval: Check every 5,000km and change every 20,000km or 24 months
Brake hose banjo bolt torque: 25nm
Bleed nipple torque: 7.8nm
Front wheel: 3 Spoke cast
Front tyre size: 120/60-17
Front tyre pressure: 36psi
Front spindle nut torque: 110nm
Front spindle clamp bolt torque: 20nm
Rear wheel: 3 spoke cast
Rear tyre size: 170/60-17
Rear tyre pressure: 41psi
Rear spindle nut torque: 110nm
Front suspension: 46mm Telescopic cartridge forks

Cartridge forks have a hollow cylinder submersed in the bottom of the fork leg. When the suspension is compressed, the end of the damping rod down the inside of the fork goes into the cartridge. This allows better control of how the oil is dispersed which means the suspension is smoother and less prone to the problems damping forks can have.

Stanchion diameter: 46mm
Recommended fork oil: Medium – 10w Fork oil
Fork oil capacity (oil change): 500ml per fork
Fork oil capacity (if forks have been rebuilt and all old oil removed): 588ml per fork
Fork oil change interval: 30,000 km or 24 months
Rear suspension: Single rear monoshock with adjustable preload, compression and rebound damping

Weights ‘n measures…
Dry weight: 176 kg (401.2 pounds)
Seat height: 815mm
Wheelbase: 1400mm
Length: 2025mm
Width: 715mm
Height: 140mm
Min turning radius: 3.2 meters
Fuel tank capacity: 18 litres

Kawasaki ZX6R battery

Kawasaki ZX6R G battery (YTX9-BS).

Electrical stuff…
Starter: Electric starter motor
System voltage: 12 volts
Max alternator output: 22amps at 5000rpm
Regulated voltage: 12.8 to 14.7 volts
Voltage regulated by: Regulator/rectifier
Regulator/rectifier location: On the right side of the bike (as your sitting on it), behind the frame, just above the top footpeg hanger bolt.

What does a regulator/rectifier do? A regulator/rectifier (or reg/rec for short) has 2 jobs. The rectifier converts the AC (alternating current) electric from the alternator into DC (direct current) electric so that it can charge the battery. The regulator makes sure the voltage is kept within certain limits so not to damage the battery and other parts.

Battery voltage capacity: 12volts / 8amps
Battery: YTX9-BS / CTX9-BS / DTX9-BS


  • The YTX9-BS battery is a 12 volt, 8 amp/hour battery and is length: 151mm width: 87mm height: 106mm in size (more info…).
  • The 1st letter(s) of the battery reference code are a manufacturers reference mark and may vary between different battery makes (different battery manufacturers use different 1st letters), so CTX9-BS, YTX9-BS and CBTX9-BS are all the same battery just from different manufacturers (more info…).
  • Also…… Avoid buying the cheapest of the cheap type batteries online as they have a horrendous failure rate (and they can be a bug!er to post back when it fails.
Ignition type: Electronic IC Ignitor (similar to a CDI)

What does a CDI do? CDI stands for capacitor discharge ignition (or ignitor, but it does have many other names as well). Basically, CDI’s store energy which they use to tell engine parts like spark plugs, coils etc when to fire.
Because they store the electricity, this makes them much faster then conventional, mechanical parts and they don’t often need maintenance (as they don’t have any moving parts). Most bikes built after 1980 will probably have some form of CDI. More info…

Spark controlled by: 2 x coil
Spark plug: NGK CR9E / Denso U27ESR-N / Champion G59C
Spark plug gaps: NGK 0.7 to 0.8mm / Denso 0.7 to 0.8mm / Champion 0.6mm
Ignition timing (BTDC): 12.5 degrees at 1300rpm
Max ignition advance: 35 degrees at 5000rpm

ZX6R Ninja oil filter

Kawasaki ZX6R G Ninja oil filter (Hiflo HF303).

Servicing stuff…
If your new to servicing or unsure, either ask a friend to help or get a ZX6R Ninja workshop manual…
Engine oil change:
Oil change interval: 5000km (3107 miles) or 12 months
Engine oil capacity: 3.6 litres
Engine oil filter capacity: 0.2 litres
Recommended engine oil: 10w40 Semi synthetic

You can use mineral and fully synthetic engine oils in the ZX6R. We don’t normally recommend mineral oils as they offer the lowest levels of protection for the engine (so if you are using a mineral oil make sure you change it often!). Good fully synthetic oils (from well recognised brands like Shell, Silkolene, Rock Oil, Castrol etc) are fine for use in the ZX6R, and they offer the highest levels of protection for the moving parts, but, the cost can be prohibitive (you get what you pay for, good oil ain’t cheap baby! :-p ). More info about different oil types can be found HERE.

Oil filter: Hiflo HF303 / Champion F306
Air filter:
Air filter: Kawasaki part no: 11013-1274 / Hiflo HFA2602
Change interval: 12000km (7456 miles)
Spark plugs:
Spark plug: 4 x NGK CR9E / Denso U27ESR-N / Champion G59C
Change interval: 6000km (3728 miles)
Cooling system:
Cooling system: Liquid cooled
Cooling system capacity: 2.3 litres
Cooling system change interval: Change every 30,000km (18645 miles) or 24 months
Brake fluid:
Recommended brake fluid: DOT 4 brake fluid
Brake fluid change interval: Check every 5,000km (3106 miles) and change every 24,000km (14912 miles) or 2 years
Front forks:
Recommended fork oil: Medium – 10w Fork oil
Fork oil capacity: Oil change: 500ml (588ml if forks have been rebuilt and all old oil removed)
Front fork oil change interval: 24,000km (14912 miles) or 2 years
Fork seals: 46x58x9.5

Note: Fork seals normally have the size as a set of 3 numbers (e.g for the ZX6R G the fork seal size is 46x58x9.5). The 1st number is the internal diameter of the seal (46 for the ZX6R G, the edge that goes against the fork tube, this will be the same diameter as the fork), the 2nd is the external diameter of the seal (58mm for the ZX6R G) and the 3rd number is the thickness of the seal (9.5mm for the ZX6R G).

Chain drive
Final drive chain frequency: Now repeat after me…..’I MUST LUBE MY CHAIN LITTLE AND OFTEN!!’ 🙂
Useful tightening torques…
Important torques
Cylinder head (1st stage): 20nm
Cylinder head (2nd stage): 49nm
Cam cover: 10nm
Magneto / flywheel: 120nm
Crankshaft sprocket: 125nm
Clutch hub: 130nm
Spark plug: 13nm
Front sprocket nut: 125nm
Front wheel spindle: 110nm
Front wheel spindle clamp (the ones in the fork leg): 20nm
Rear wheel spindle: 110nm
Oil torques
Oil filter: 10nm
Oil drain bolt: 20nm
Oil pressure switch: 15nm
Engine mounting point torques
Engine mounting bolts and nuts: 44nm
Engine mounting bracket bolts: 23nm
Engine mounting clamp bolts: 23nm
Cooling system torques
Radiator fan switch: 18nm
Water pump cover bolts: 12nm
Engine torques
Spark plugs: 13nm
Cylinder head (1st stage): 20nm
Cylinder head (2nd stage): 49nm
Engine side cover bolts: 12nm
Exhaust pipe connector bolts: 34nm
Exhaust pipe clamp bolts: 34nm
Oil pressure switch: 15nm
Neutral switch: 15nm
Wheel torques
Front wheel spindle nut: 110nm
Front wheel spindle clamp bolts (in the fork): 20nm
Rear wheel spindle nut: 110nm
Rear final/chain drive torques
Front sprocket nut: 125nm
Front sprocket cover bolts: 12nm
Rear sprocket nuts: 59nm
Brake torques
Front caliper mounting bolts: 34nm
Front brake disc bolts: 23nm
Rear caliper mounting bolts: 25m
Rear brake disc bolts: 23nm
Suspension torques
Front fork clamp bolts: 20nm
Front fork bottom allen (drain) bolts: 39nm
Rear shock absorber nuts: 34nm
Swingarm pivot shaft nut: 110nm
Frame torques
Footpeg holder bolts: 34nm
Side stand bracket bolts: 49nm
Rear sub frame securing nuts and bolts: 44nm
Electrical system torques
Magneto / flywheel / alternator: 120nm
Alternator cover bolts: 12nm
Starter motor mounting bolts: 11nm

Note: We have LOADS more torque settings for this bike, but the list above has been limited to the more important ones. If there’s a torque setting not shown on here please ask us in the comments box below 🙂

ZX6R Ninja air filter

Kawasaki ZX6R G aftermarket air filter (Hiflo HFA2602).

Useless stuff…
Released in 1998, the ZX6R G1 is still considered a good bike, even by modern bike standards. Although not quite as quick as the Suzuki GSXR600 SRAD, it is alot easier to live with and doesn’t have you clutching your backside after 20 miles (although it can get a bit uncomfortable on very long distances). The bike is fairly rugged with not really any major faults and has a lovely howl through the airbox when ridden hard.

Buying advice…
Not really much to be wary of with these bikes. Obviously, stay away from ex racers and courier bikes. Not many couriers used them as they weren’t exactly a cheap hack, but there are alot of ex race bikes around (look for drilled nuts/sump bolts etc). Alloy parts do tend to pit and suffer if it’s been used in all weathers or left outside all year and electrics can be problematic if they get wet. These are older bikes now, so beware of rotten exhausts, pitted forks etc. However, there are loads of aftermarket parts for these bikes so most parts are plentiful and cheap on sites like eBay and Amazon.

Sources / Thanks to…
ZX6R.com for the service manual
Silkolene for the oil info

If you’ve got any questions or comments please feel free to leave them below 🙂

Disclaimer: The information on this page is correct to the best of our knowledge. But the info should NOT be taken as 100% accurate as we can, occasionally make mistakes!


3 responses to “Kawasaki ZX6R G Ninja Specs and Info (1998 to 2000)”

  1. What’s the purple colour code thanks

    1. Robert E Brown Jr Avatar
      Robert E Brown Jr

      How many “Notches” or “marks” does the radiator fan turn on?

    2. did you ever find the purple colour code ?? I am looking for it too. For1998 ZX6R

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