'04 YZFR6

 Engine Configuration  Inline Four, 4-Stroke, DOHC
 Engine Displacement  599 cc
 Engine Cooling  Liquid
 Compression Ratio 12.4:1
 Combustion Chamber Design Pentroof
 Valves Per Cylinder  4
Intake Valves Per Cylinder
 2

  Exhaust Valves Per Cylinder
 2
 Bore x Stroke 65.5 x 44.5
 Claimed Peak Horsepower  117 bhp @ 13,000 rpm
 Claimed Peak Torque  49 lbs. ft. @10,800 rpm
 Measured Peak Horsepower 101.8 bhp @ 12,500 rpm
 Measured Peak Torque 43.6 lbs. -ft. @ 12,000 rpm
 Measured Horsepower To Weight Ratio  4.15 pounds per horsepower
 Engine Redline 15,500 rpm
 Valve Angle (Included) 28 degrees (14 degrees
Intake, 14 degrees Exhaust)
 Combustion Chamber Volume 10.6c
 Valve Train Type   DOHC, Link-plate Chain Drive,
Bucket Followers, Shim-under-bucket
Lash Adjustment
 Valve Adjustment Interval 26,000 miles
 Intake Valve Diameter 25 mm
 Exhaust Valve Diameter 22.0 mm
 Intake Valve Stem Diameter  4.0 mm
 Exhaust Valve Stem Diameter  4.0 mm
 Intake Valve Maximum Lift 8.5 mm
 Exhaust Valve Maximum Lift 7.6 mm
 Intake Valve Timing
Open BTDC
 39 degrees
Close ABDC
 69 degrees
Duration
288 degrees
 Exhaust Valve Timing
Open BBDC
66 degrees
Close ATDC
34 degrees
Duration
280 degrees
 Valve Timing Measuring Point Intake, 0.15 mm; Exhaust, 0.25 mm
 Fuel Delivery System Mikuni Fuel Injection
Throttle Body Venturi Size 38 mm
 Air Filter Type Wet Element
 Exhaust System Type Four-into-two-into-one
 Ignition System Digital Electric
 Lubrication System Wet Sump
 Oil Capacity  3.6 quarts (3.4 liters)
 Fuel Capacity 4.5 gallons (17 liters)
 Transmission Type  6-speed, Constant Mesh
 Clutch Type  Multi-plate, Wet
Clutch Actuation System

 Cable
Clutch Spring Type
Coil
Number Of Clutch Springs
6
 Number of Clutch Plates 15
 Drive Plates
8
 Driven Plates
7
 Primary Drive Gear
 Primary Drive Gear Teeth (Ratio) 86/44 (1.955:1)
 Final Drive Sprocket Teeth (Ratio) 48/16 (3.000:1)
 Transmission Gear Teeth (Ratios)
6th
26/ 24 (1.083:1)
5th
 25/ 21 (1.190:1)
4th
 32/ 24 (1.333:1)
3rd
 28/ 18 (1.556:1)
2nd
 37/ 19 (1.947:1)
1st
37/ 13 (2.846:1)
 Transmission Overall Ratios
6th
 6.352:1
5th
 6.979:1
4th
7.818:1
3rd
9.126:1
2nd
11.419:1
1st
16.692:1
Theoretical Speed In Gears At Redline  

6th
178 mph

5th
162 mph

4th
145 mph

3rd
124 mph

2nd
99 mph

 1st
68 mph