2002 Yamaha YZF-R1

 Engine Configuration  Inline Four, 4-Stroke, DOHC
 Engine Displacement 998 cc
 Engine Cooling System  Liquid
 Compression Ratio 11.8: 1
 Combustion Chamber Design 5-valve
 Valves Per Cylinder 5
Intake Valves Per Cylinder
3

  Exhaust Valves Per Cylinder
 2
 Bore x Stroke 74 mm x 58 mm
 Claimed Peak Horsepower 150 bhp @ 10,000 rpm
 Claimed Peak Torque 108 lbs. - ft. @ 8500 rpm
 Engine Redline 11, 750 rpm
 Valve Angle (Included) Center Intake 9.5 degrees;
Outside intakes, 16.75 degrees;
Exhaust, 11.5 degrees (28.25 degrees)
 Combustion Chamber Volume 14 cc
 Valve Train Type   DOHC, Link-plate Chain Drive,
Bucket Followers, Shim-under-bucket
Lash Adjustment
 Valve Adjustment Interval 26,600 miles
 Intake Valve Diameter 23.0 mm
 Exhaust Valve Diameter 24.5 mm
 Intake Valve Stem Diameter 3.9 mm
 Exhaust Valve Stem Diameter 4.4 mm
 Intake Valve Maximum Lift 7.35 mm
 Exhaust Valve Maximum Lift 7.75 mm
 Intake Valve Timing
Open BTDC
29 degrees
Close ABDC
 59 degrees
Duration
268 degrees
 Exhaust Valve Timing
Open BBDC
60 degrees
Close ATDC
36 degrees
Duration
276 degrees
 Valve Timing Measuring Point Intake, 0.15 mm; Exhaust, 0.25 mm
 Fuel Delivery System Mikuni Fuel Injection
 Carburetor Venturi Size 40 mm
 Air Filter Type Vicious-type Element
 Exhaust System Type 4-1 with EXUP
 Ignition System Digital Electronic
 Lubrication System Wet Sump
 Oil Capacity 3.8 quarts (3.6 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
Diaphragm
Number Of Clutch Springs
1
 Number of Clutch Plates 15
 Drive Plates
8
 Driven Plates
7
 Primary Drive Gear (Straight cut)
 Primary Drive Gear Teeth (Ratio) 29/ 26 (1.115:1)
 Final Drive Sprocket Teeth (Ratio) 15/ 45 (3.000:1)
 Transmission Gear Teeth (Ratios)
6th
29/ 26 (1.115:1)
5th
30/ 25 (1.200:1)
4th
28/ 21 (1.333:1)
3rd
30/ 20 (1.500:1)
2nd
35/ 19 (1.842:1)
1st
35/ 14 (2.500:1)
 Transmission Overall Ratios
6th
4.738:1
5th
5.100:1
4th
5.665:1
3rd
6.375:1
2nd
7.828:1
1st
10.624:1