| Engine Configuration |
Inline Four, 4-stroke |
| Engine Displacement |
998 cc |
| Engine Cooling
System |
Liquid |
| Compression
Ratio |
12.7:1 |
| Combustion
Chamber Design |
Pentroof |
| Valves Per
Cylinder |
4 |
| Intake Valves Per Cylinder |
2 (Steel) |
| Exhaust Valves Per Cylinder |
2 (Titanium) |
| Bore x Stroke |
76 mm x
55 mm |
| Claimed Peak Horsepower |
181 bhp (with ram air
effect) @ 11,700 rpm |
| Claimed Peak Torque |
85 lbs. - ft @ 9,500
rpm |
| Measured
Peak Horsepower |
157.44 bhp
@ 11,700 rpm |
| Measured
Peak Torque |
77.93 lbs.
- ft. @ 8,350 rpm |
| Measured Horsepower-to-weight
Ratio |
2.86 pounds per horsepower |
| Engine Redline |
13,000 rpm |
| Valve Angle (Included) |
12 degrees
intake, 13 degrees exhaust (25 degrees) |
| Combustion
Chamber Volume |
21.2 cc |
| Valve Train
Type |
DOHC, Gear
and Roller-chain Drive, Bucket Followers, Shim-under-bucket
Lash Adjustment |
| Valve Adjustment
Interval |
15,000 miles |
| Intake Valve
Diameter |
30 mm |
| Exhaust
Valve Diameter |
25.5 mm |
| Intake Valve
Stem Diameter |
4.5 mm |
| Exhaust
Valve Stem Diameter |
4.5 mm |
| Intake Valve
Maximum Lift |
9.1 mm |
| Exhaust
Valve Maximum Lift |
8.5 mm |
| Intake Valve
Timing |
|
| Open BTDC |
46 degrees |
| Close ABDC |
74 degrees |
| Duration |
300 degrees |
| Exhaust
Valve Timing |
|
| Open BBDC |
66 degrees |
| Close ATDC |
46 degrees |
| Duration |
292 degrees |
| Valve Timing
Measuring Point |
0.2 mm Intake,
.03 mm Exhaust |
| Fuel Delivery
System |
Mikuni Fuel
Injection |
| Throttle
Body Venturi Size |
43 mm |
| Air Filter
Type |
Pleated
Paper |
| Exhaust
System Type |
4-2-1-2 |
| Ignition
System |
Digital |
| Lubrication
System |
Wet Sump |
| Oil Capacity |
4.2 quarts |
| Fuel Capacity |
4.5 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 |
19 |
| Drive Plates |
9 |
| Driven Plates |
10 |
| Primary
Drive |
Gear (Straight-cut) |
| Primary
Drive Gear Teeth (Ratio) |
87/ 54 (1.611:1) |
| Final Drive
Sprocket Teeth (Ratio) |
40/ 17 (2.353:1) |
| Transmission
Gear Teeth (Ratios) |
|
| 6th |
30/ 23 (1.304:1) |
| 5th |
29/ 21 (1.381:1) |
| 4th |
32/ 21 (1.524:1) |
| 3rd |
33/ 19 (1.737:1) |
| 2nd |
39/ 19 (2.053:1) |
| 1st |
38/ 15 (2.533:1) |
| Transmission
Overall Ratios |
|
| 6th |
4.819:1 |
| 5th |
5.104:1 |
| 4th |
5.632:1 |
| 3rd |
6.419:1 |
| 2nd |
7.587:1 |
| 1st |
9.361:1 |
