Engine |
|
|---|---|
| Type | 4-stroke, gasoline, air-cooled, DOHC forward incline four cylinder with 2 valves per cylinder |
| Displacement | 748cc (45.64 cu.in) |
| Bore / Stroke | 65.0 / 56.4 mm (2.559 / 2.220 in) |
| Redline | 9500 rpm |
| Compression ratio | 9.2:1 |
| Starting system | Electric starter |
| Fuel tank capacity | 17 L (4.5 US gal) total with 3.5 L (0.9 US gal) as reserve |
| Engine oil quantity | total = 3.5 L (3.7 US qt) |
| Engine oil type | Warm weather: 20W40, Cold weather: 10W30 |
| Lubrication system | Wet sump |
| Spark Plug | BP7ES (NGK), W22EP (NIPPONDENSON) |
| Carburetors | HSC32 (Hitachi) |
| Exhaust system | 4 into 2 |
| Air Cleaner | Dry type element (paper) |
| Clutch | Wet, multiple disc |
| Gear ratios (overall) |
|
| Final drive | Shaft drive |
Chassis |
|
|---|---|
| Wheelbase | 56.9in (1445mm) |
| Weight (net) | 520 lbs (236kg) |
| Frame | Tubular steel, double cradle |
| Steering | Caster = 29deg Trail = 4.88 in (124 mm) |
| Tire size | Front = 3.25H19-4Pr (100/90-19) Rear = 130/90-16 67H |
| Braking system | Front = Dual 267 mm(10.5 in) discs Rear = Drum brake |
| Suspension | Front = Telescopic fork, 5.9 in of travel (adjustments: air and
damping) Rear = Dual coil spring shocks, 3.8 in of travel (adjustments: preload and damping) |
Performance |
|
|---|---|
| Quarter Mile Time | 12.64 sec at 105mph (I've heard that Yamaha claimed 11.99 sec for the Seca using a professional drag racer!) |
| Claimed Maximum Horsepower | 76 hp (Actual = around 60 hp) |
| Claimed Maximum Torque | 45.6 ft/lbs at 7500rpm |
| Top Speed | ~130mph |
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