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2008 Yamaha YZF-R1

 Engine Configuration Inline Four, 4 Stroke
Engine Displacement 998 cc
 Engine Cooling System  Liquid
 Compression Ratio  12.7:1
 Combustion Chamber Design  Twin Swirl
 Valves Per Cylinder  4
 Intake Valves Per Cylinder  2 (Titanium)
 Exhaust Valves Per Cylinder  2 (Steel)
 Bore x Stroke 77 mm x 53.6 mm
 Connecting Rod Length (center-to-center) 103 mm
Connecting Rod Material Steel
Claimed Peak Horsepower 178 bhp @ 12,500 rpm
Claimed Peak Torque 82 lbs.-ft @ 10,000 rpm
 Measured Peak Horsepower  150.50 bhp @ 12,400 rpm
 Measured Peak Torque  72.22 lbs. - ft. @ 9,950 rpm
 Engine Redline  13,750 rpm
Valve Angle (I ncluded)  11.5 degrees intake, 12.5 degrees exhaust (24 degrees)
 Combustion Chamber Volume  22.6 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  9.2 mm
 Exhaust Valve Maximum Lift  8.3 mm
 Intake Valve Timing  
 Open BTDC  37 degrees
 Close ABDC  67 degrees
 Duration  284 degrees
 Exhaust Valve Timing  
 Open BBDC  69 degrees
 Close ATDC  33 degrees
 Duration  282 degrees
 Valve Timing Measuring Point  0.2 mm Intake, 0.3 mm Exhaust
 Fuel Delivery System  Mikuni Fuel Injection
 Throttle Body Venturi Size  45 mm
 Air Filter Type  Pleated Paper
 Exhaust System Type  4-2-1 (Titanium)
 Ignition System  Digital
 Lubrication System  Wet Sump
 Oil Capacity  4 quarts
 Fuel Capacity  4.8 gallons
 Transmission Type  6-speed, Constant Mesh
 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)  45/ 17 (2.647:1)
 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  5.079:1
 5th  5.459:1
 4th  6.091:1
 3rd  7.052:1
 2nd  8.257:1
 1st  10.138:1
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