2004-2005 Triumph Rocket III Knoledge Library

2004-2005 Triumph Rocket III Introduction

The Triumph Rocket III Roadster is well known for its status of having the largest displacement engine of a production motorcycle. With a whopping 2,294cc or 140 cubic inch, 3-cylinder engine.

Development of the Triumph Rocket III Roadster began in 1998. It was intended to be a competitor to Harley Davidson Ultraglide and the Honda Goldwing. So initially the target engine displacement was 1,600cc.

However, in 2002 Yamaha launched it's 1,670cc Road Star Warrior. And, at the same time Honda launched it's 1,795cc VTX1800. Triumph decided to raise the bar. Squeezing in a 2.3 litre engine.

Released in 2004, the bike never quite managed to win over the loyal Harley and Goldwing riders. But as Motor Cycle News said, "The Triumph Rocket III is an incredible experience and bravo to Triumph for making it." They also went on to say that "Compared to a Harley, the Rocket III is a steal. It’s better braked, faster, handles better and it’s British."

The sheer force and presence of the Triumph Rocket III continues to deliver a simply stunning riding experience. An unmatched experience on two wheels.

2004-2005 Triumph Rocket III Full Specifications

Get to know the 2004-2005 Triumph Rocket III in exquisite detail with our meticulously crafted motorcycle specifications tables.

Click or tap on a navigation pane below to find your way through our highly detailed, categorised 2004-2005 Triumph Rocket III specifications.

2004-2005 Triumph Rocket III Dimensions Specifications Table

Attribute	Value
Overall length	2,480 mm
Overall width	880 mm
Wheelbase	1,690 mm
Seat height	740 mm
Dry Weight	320 kg (without fuel and fluids)
Maximum payload	235 kg (rider, passenger, luggage and accessories)

2004-2005 Triumph Rocket III Frame Specifications Table

Attribute	Value
Frame type	Tubular steel
Rake / Caster angle	32 °
Trail length	152 mm

2004-2005 Triumph Rocket III Engine Specifications Table

Attribute	Value
Power	142 PS @ 5,750 rpm (DIN 70020)
Torque	200 Nm @ 2,500 rpm
Engine capacity / displacement	2,294 cc
Engine configuration	3 Cylinder, 12 Valve, DOHC
Arrangement	In-line, longitudinal
Bore and Stroke	101.6 mm x 94.3 mm
Compression ratio	8.7 : 1

2004-2005 Triumph Rocket III Cylinder Head Specifications Table

Attribute	Value
Intake valve seat angle	90 °
Intake valve seat width	1.000 mm - 1.100 mm
Intake valve seat width	1.500 mm (service limit)
Exhaust valve seat angle	90 °
Exhaust valve seat width	1.000 mm - 1.100 mm
Exhaust valve seat width	1.000 mm - 1.100 mm (service limit)

2004-2005 Triumph Rocket III Valves and Springs Specifications Table

Attribute	Value
Intake valve clearance	0.10 mm - 0.15 mm
Intake valve lift	8.30 mm
Intake valve stem diameter	5.475 mm - 5.490 mm
Intake valve guide diamater	5.485 mm - 5.500 mm (bore)
Intake valve seat angle	90 °
Intake valve head diameter	37.90 mm
Intake valve seat width	1.98 mm - 2.26 mm
Exhaust valve clearance	0.15 mm - 0.20 mm
Exhaust valve lift	8.30 mm
Exhaust valve stem diameter	5.476 mm -5.490 mm
Exhaust valve guide diameter	5.485 mm - 5.500 mm (bore)
Exhaust valve seat angle	90 °
Exhaust valve head diameter	32.30 mm
Exhaust valve seat width	1.98 mm - 2.26 mm

2004-2005 Triumph Rocket III Valve Train Specifications Table

Attribute	Value
Type	DOHC
Intake valve bucket diameter	28.015 mm - 28.035 mm (bore)
Intake valve bucket diameter	27.978 mm - 27.993 mm (outer)
Exhaust valve bucket diameter	28.015 mm - 28.035 mm (bore)
Exhaust valve bucket diameter	27.978 mm - 27.993 mm (outer)

2004-2005 Triumph Rocket III Camshaft and Timing Specifications Table

Attribute	Value
Intake valve cam timing	opens @ 12° BTDC @ 1.0 mm lift
	closes @ 28° ABDC @ 1.0 mm lift
	220 ° open duration
Exhaust valve cam timing	opens @ 41° BBDC @ 1.0 mm lift
	closes @ 11° ATDC @ 1.0 mm lift
	232 ° open duration
Camshaft journal diameter	22.93 mm - 22.96 mm (outer)
Camshaft journal diameter	23.000 mm - 23.021 mm (bore)
Camshaft journal clearance	0.040 mm - 0.091 mm
Camshaft journal clearance	0.13 mm (service limit)
Camshaft end float	0.10 mm - 0.13 mm
Camshaft run-out	0.015 mm

2004-2005 Triumph Rocket III Crankshaft Specifications Table

Attribute	Value
Crankshaft big end journal diameter	40.946 mm - 40.960 mm
Crankshaft big end journal diameter	40.922 mm (service limit)
Crankshaft big end bearing clearance	0.035 mm -0.065 mm
Crankshaft big end bearing clearance	0.100 mm (service limit)
Crankshaft main bearing journal diameter	43.092 mm -43.108 mm
Crankshaft main bearing journal diameter	43.068 mm (service limit)
Crankshaft main bearing clearance	0.018 mm - 0.041 mm
Crankshaft main bearing clearance	0.10 mm (service limit)
Crankshaft end float	0.05 mm - 0.20 mm
Crankshaft end float	0.40 mm (service limit)
Crankshaft run-out	0.04 mm
Crankshaft run-out	0.07 mm (service limit)

2004-2005 Triumph Rocket III Cylinder and Piston Specifications Table

Attribute	Value
Piston diameter	101.561 mm - 101.577 mm (outer)
Piston diameter	101.511 mm (outer service limit)
Gudgeon pin bore diameter in piston	21.994 mm - 22.001 mm
Gudgeon pin bore diameter in piston	22.022 mm (service limit)
Gudgeon pin diameter	21.982 mm - 21.987 mm (outer)
Gudgeon pin diameter	21.972 mm (outer service limit)
Top piston ring to groove clearance	0.002 mm - 0.006 mm
Top piston ring to groove clearance	0.16 mm (service limit)
Second piston ring to groove clearance	0.02 mm - 0.06 mm
Second piston ring to groove clearance	0.16 mm (service limit)
Top piston ring groove width	1.01 mm -1.03 mm
Top piston ring groove width	1.11 mm (service limit)
Second piston ring groove width	1.01 mm - 1.03 mm
Second piston ring groove width	1.11 mm (service limit)
Piston ring oil groove width	2.51 mm - 2.53
Top piston ring end gaps	0.20 mm - 0.35 mm
Top piston ring end gaps	0.55 mm (service limit)
Second piston ring end gaps	0.30 mm - 0.50 mm
Second piston ring end gaps	0.675 mm (service limit)
Piston ring oil end gaps	0.20 mm - 0.70 mm
Piston ring oil end gaps	0.875 mm (service limit)
Connecting rod small end diameter	22.005 mm - 22.018 mm (inner)
Connecting rod small end diameter	22.028 mm (inner service limit)
Connecting rod big end side clearance	0.15 mm 0.30 mm
Connecting rod big end side clearance	0.50 mm (service limit)

2004-2005 Triumph Rocket III Clutch and Primary Drive Specifications Table

Attribute	Value
Primary Drive type	Gear, with backlash eliminator
Reduction ratio	1.034 : 1
Clutch type	Wet multi-plate
Clutch actuation method	Cable
Clutch lever free play	2 mm - 3 mm
Number of friction plates	10
Friction plate thickness	3.72 mm - 3.88 mm
Friction plate thickness	3.5 mm (service limit)

2004-2005 Triumph Rocket III Transmission Specifications Table

Attribute	Value
Type	5-speed, constant mesh
Gear ratio	1st gear = 2.929 : 1
	2nd gear = 1.947 : 1
	3rd gear = 1.435 : 1
	4th gear = 1.160 : 1
	5th gear = 0.964 : 1
Gear selector fork / claw thickness	5.90 mm - 6.00 mm
Gear selector fork /claw thickness	5.80 mm (service limit)
Gear selector groove width	6.05 mm - 6.15 mm
Gear selector groove width	6.30 mm (service limit)
Gear selector fork to groove clearance	0.50 mm (service limit)

2004-2005 Triumph Rocket III Final Drive Specifications Table

Attribute	Value
Final drive	Bevel geared crown wheel and pinion
Final drive ratio	2.846 : 1

2004-2005 Triumph Rocket III Lubrication Specifications Table

Attribute	Value
Oil capacity	5.9 litres (dry fill)
	5.4 litres (wet fill, includes filter)
	5.1 litres (wet fill, excludes filter)
Recommended oil approval rating	API SH (or higher) and JASO MA
Oil viscosity	10W / 40 or 15W / 50
Oil type	Semi or fully synthetic
Oil pump rotor tip clearance	0.15 mm
Oil pump rotor tip clearance	0.20 mm (service limit)
Oil pump body clearance	0.15 mm - 0.22 mm
Oil pump body clearance	0.20 mm (service limit)
Oil pump rotor end float	0.02 mm - 0.07 mm
Oil pump rotor end float	0.10 mm (service limit)

2004-2005 Triumph Rocket III Cooling System Specifications Specifications Table

Attribute	Value
Coolant mixture	50% anti freeze in distilled water
Anti-freeze type	Mobil Antifreeze
Coolant system capacity	3.2 litres
Radiator cap opening pressure	17.4 psi
Thermostat begin to open temperature	85 ℃
Temperature gauge sensor resistance	187Ω @ 100 ℃

2004-2005 Triumph Rocket III Fuel System Specifications Table

Attribute	Value
Fuel type	Unleaded, 95 RON (US - 89 RON/MON)
Fuel tank capacity	25 litres
Low level warning lamp	5.5 litres remaining
Fuel pump type	Submerged, electric
Fuel pressure	43.5 psi (nominal)
Purge control system	Modulated, vacuum

2004-2005 Triumph Rocket III Fuel Injection System Specifications Table

Attribute	Value
Type	Multi point sequential
Idle speed	800 rpm
Injector type	Single nozzle
Throttle	Twin butterfly
Control sensors	Coolant temperature, manifold absolute pressure (all cylinders), intake air temperature, barometric pressure, gear position, road speed, primary and secondary throttle position.

2004-2005 Triumph Rocket III Ignition System Specifications Table

Attribute	Value
Type	Digital,inductive
Electronic rev limiter	6,500 rpm
Timing pick-up coil resistance	0.56 KΩ ℃
Timing pick up coil air gap	Fixed, not adjustable mm
Ignition coil type	Inductive, twin output
Spark plug type	NGK DPR8EA9, 2 per cylinder
Spark plug gap	0.9 mm

2004-2005 Triumph Rocket III Front Suspension and Steering Specifications Table

Attribute	Value
Front axel travel	120 mm
Recommended front fork oil grade	Kayaba 01 oil (SAE 0W)
Oil level	89 mm (fork fully compressed, sping removed)
Oil volume	667 ml (dry fill)

2004-2005 Triumph Rocket III Rear Suspension Specifications Table

Attribute	Value
Rear axel travel	105 mm

2004-2005 Triumph Rocket III Front Brake Specifications Table

Attribute	Value
Front brake type	Two four piston callipers acting on twin discs
Front disc diameter	320 mm
Front disc thickness	5.0 mm
Front disc thickness	4.0 mm (service limit)
Front disc run-out	0.3 mm (service limit)
Recommended front brake fluid	DOT 4
Front master cylinder diameter	14 mm (inner)

2004-2005 Triumph Rocket III Rear Brake Specifications Table

Attribute	Value
Rear disc diameter	316 mm
Rear disc thickness	7.5 mm
Rear disc thickness	6.5 mm (service limit)
Rear disc run-out	0.15 mm (service limit)
Recommended rear brake fluid	DOT 4
Rear master cylinder diameter	12.7 mm (inner)

2004-2005 Triumph Rocket III Wheels and Tyres Specifications Table

Attribute	Value
Front wheel size	MT 3.5 x 17 inch
Front tyre size	150 / 80 R17
Front tyre pressure	34 psi (cold)
Front wheel rim axial run-out	0.5 mm (service limit)
Front wheel rim radial run-out	0.5 mm (service limit)
Rear wheel size	MT 7.5 x 16 inch
Rear tyre size	240 / 50 R16
Rear tyre pressure	42 psi (cold)
Rear wheel rim radial run-out	0.5 mm (service limit)
Rear wheel rim axial run-out	0.5 mm (service limit)

2004-2005 Triumph Rocket III Electrical Charging Specifications Table

Attribute	Value
Battery voltage rating	12 volts DC
Battery capacity	18 ampere hour (Ah)
Alternator current rating	37 amps

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2004-2005 Triumph Rocket III