| Engine Configuration |
Parallel Twin, 4-stroke |
| Engine Displacement |
249 cc |
| Engine Cooling |
Liquid |
| Compression Ratio |
11.6:1 |
| Combustion Chamber Design |
Pentroof |
| Valves Per Cylinder |
4 |
| Intake Valves Per Cylinder |
2 (Steel) |
| Exhaust Valves Per Cylinder |
2 (Steel) |
| Bore x Stroke |
62.0mm x 41.2mm |
Connecting Rod Length
(center-to-center) |
98.9mm
|
| Connecting Rod Material |
Steel |
| Claimed Peak Horsepower |
25.37bhp @ 11,300rpm |
| Claimed Peak Torque |
12.96lbs.-ft. @ 9,750 |
| Engine Redline |
13,280 rpm |
| Valve Angle (Included) |
16.2mm Intake/ 19.3 degrees Exhaust (35.5 degrees) |
| Combustion Chamber Volume |
11.7cc |
| Valve Train Type |
DOHC, Link-plate Chain Drive, Bucket Followers, Shim-under-bucket Lash Adjustment |
| Valve Adjustment Interval |
12,000 miles |
| Intake Valve Diameter |
22.5 mm |
| Exhaust Valve Diameter |
20.0 mm |
| Intake Valve Stem
Diameter |
4.5 mm |
| Exhaust Valve Stem Diameter |
4.5 mm |
| Intake Valve Maximum
Lift |
7.9 mm |
| Exhaust Valve Maximum
Lift |
6.9 mm |
| Intake Valve Timing |
|
| Open BTDC |
36 degrees |
| Close ABDC |
31 degrees |
| Duration |
272 degrees |
| Exhaust Valve Timing |
|
| Open BTDC |
61 degrees |
| Close ABDC |
31 degrees |
| Duration |
272 degrees |
| Valve Timing Measuring
Point |
0.3mm (lift)
|
| Fuel Delivery System |
(2) Keihin CVK30 Carburetors |
| Throttle Body Venturi
Size |
30mm |
| Air Filter Type |
Foam Element |
| Exhaust System Type |
2-1 (Steel) |
| Ignition System |
Digital |
| Lubrication System |
Wet Sump |
| Oil Capacity |
1.8 quarts (1.7 liters) |
| Fuel Capacity |
4.8 gallons (18.2 Liters) |
| Transmission Type |
6-speed Constant Mesh |
| Clutch Type |
Multi-plate, Wet |
| Clutch Actuation System |
Cable |
| Clutch Spring Type |
Coil |
| Number Of Clutch Springs |
4 |
| Number of Clutch Plates |
9 |
| Drive Plates |
5 |
| Driven Plates |
4 |
| Primary Drive |
Gear (straight-cut) |
| Primary Drive Gear Teeth (Ratio) |
71/23 (3.087:1) |
| Final Drive Sprocket Teeth
(Ratio) |
45/14 (3.214:1)
|
| Transmission Gear Teeth (Ratios) |
|
| 6th |
25/28 (0.892:1) |
| 5th |
27/27 (1.000:1) |
| 4th |
29/25 (1.160:1) |
| 3rd |
32/22 (1.454:1) |
| 2nd |
34/19 (1.789:1) |
| 1st |
39/15 (2.600:1) |
| Transmission Overall
Ratios |
|
| 6th |
8.849:1 |
| 5th |
9.921:1 |
| 4th |
11.508:1 |
| 3rd |
14.4252:1 |
| 2nd |
17.749:1 |
| 1st |
25.795:1 |
| |
|
