2010 Yamaha YZF-R1

Engine Configuration Inline Four, 4-Stroke, With Cross-Plane Crankshaft
Engine Displacement 998 cc
Engine Cooling Liquid
Compression Ratio 12.7:1
Combustion Chamber Design Pentroof
Valves Per Cylinder 4
Intake Valves Per Cylinder 2 (Titanium)
Exhaust Valves Per Cylinder 2 (Steel)
Bore x Stroke 78 mm x 52.5 mm
Conecting Rod Length
          (center-to-center)
103 mm
Connecting Rod Material Steel
Measured Peak Horsepower 152.62 bhp @ 11,750 rpm
Measured Peak Torque 76.77 lbs. - ft. @ 8,900 rpm
Measured Horsepower-to-weight Ratio 3.10 pounds per horsepower
Engine Redline 13,750 rpm
Valve Angle (Included) 12 degrees Intake/ 12.5 degrees Exhaust (24.5 degrees)
Combustion Chamber Volume 23.02 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 31 mm
Exhaust Valve Diameter 25 mm
Intake Valve Stem Diameter 5.0 mm
Exhaust Valve Stem Diameter 4.5 mm
Intake Valve Maximum Lift 9.1 mm
Exhaust Valve Maximum Lift 8.2 mm
Intake Valve Timing  
          Open BTDC 37 degrees
          Close ABDC 67 degrees
          Duration 284 degrees
Exhaust Valve Timing  
          Open BTDC 61 degrees
          Close ABDC 31 degrees
          Duration 272 degrees
Valve Timing Measuring Point 0.15 mm Intake, 0.25 mm Exhaust (lift)
Fuel Delivery System Mikuni Fuel Injection
Throttle Body Venturi Size 45 mm
Air Filter Type Pleated Paper
Exhaust System Type 4-1-2 (Stainless/Titanium)
Ignition System Digital
Lubrication System Wet Sump
Oil Capacity 4.0 quarts (3.8 liters)
Fuel Capacity 4.8 gallons (18.0 liters)
Transmission Type 6-speed, Constant Mesh, Cassett-type
Clutch Type Multi-plate, Wet, Back-torque-limiting
Clutch Actuation System Cable
Clutch Spring Type Coil
Number Of Clutch Springs 6
Number of Clutch Plates 17
          Drive Plates 9
          Driven Plates 8
Primary Drive Gear (Straight-cut)
Primary Drive Gear Teeth (Ratio) 65/43 (1.512:1)
Final Drive Sprocket Teeth (Ratio) 47/17 (2.765:1)
Transmission Gear Teeth (Ratios)  
          6th 33/26 (1.269:1)
          5th 30/22 (1.364:1)
          4th 35/23 (1.522:1)
          3rd 37/21 (1.762:1)
          2nd 33/16 (2.063:1)
          1st 38/15 (2.533:1)
 Transmission Overall Ratios  
          6th 5.305:1
          5th 5.702:1
          4th 6.636:1
          3rd 7.366:1
          2nd 8.625:1
          1st 10.589:1