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 |
|
|