CB750 K1: 1970 - 1971
| Production Dates | August 1970 through November 1971 |
|---|---|
| Production Numbers | 77,000 |
| Starting Frame# | 1044806 |
| Starting Engine# | E1053399 |
| Colors | Candy Gold, Candy Ruby Red, Candy Garnet Brown, Valley Green Metallic, Polynesian Blue Metallic, Candy Blue Green, Oriental Blue Metallic |
| Features | Tank, side covers, fork uppers and headlight shell were painted the same color as the tank. The side covers were smaller without slots on the leading edge. The throttle linkage was changed to a cable-controlled shaft joining the four carbs together. |
| Dimensions | ||
|---|---|---|
| Item | English | Metric |
| Overall length | 85.0 in. | 2,160 mm |
| Overall width | 34.8 in. | 885 mm |
| Overall height | 44.5 in. | 1,155 mm |
| Wheel base | 57.3 in | 1,455 mm |
| Seat height | 31.5 in. | 800 mm |
| Foot Peg Height | 12.2 in. | 310 mm |
| Ground Clearance | 5.5 in. | 160 mm |
| Curb weight (dry) | 479 lb | 218 kg |
| Weight distribution L/R | 271.1/209.5 lb | 123/205 kg |
| Frame & Suspension | ||
|---|---|---|
| Type | Double cradle tubular steel | |
| Front Suspension | Telescopic fork, travel 5.6 in., 143mm | |
| Rear Suspension | Swing arm, travel 3.3 in., 85mm | |
| Front Tire Size, Type | 3.25-19 (4PR) Rib tire, tire air pressure 2.0 kg/cm2, 28 psi | |
| Rear Tire Size, Type | 4.00-18 (4 PR) Block tire, tire air pressure 2.0 kg/cm2, 28 psi | |
| Front Brake | Disk brake, lining swept area 59.3 sq. in., 382.9cm2 | |
| Rear Brake | Internal expanding shoe, lining swept area 33.2in2, 220.5cm2 | |
| Fuel Capacity | 4.5 US gal, 3.7 Imp. gal | 17 liter |
| Fuel Reserve Capacity | 1.3 US gal, 1.1 Imp. gal | 5 liter |
| Caster Angle | 63º | |
| Trail Length | 3.7 in. | 95mm |
| Front fork oil capacity (dry fill) | 7.5-7.8 ozs | 220-230 cc |
| Front fork oil capacity (refill) | 6.9-7.1 ozs | 200-210cc |
| Engine | ||
|---|---|---|
| Item | English | Metric |
| Type | Air-cooled, 4-stroke, O.H.C. engine | |
| Cylinder Arrangement | 4-cylinder in line | |
| Bore and Stroke | 2.402x2.408 in. | 61x63 mm |
| Displacement | 44.9 cu in | 736 cc |
| Compression Ratio | 9.0:1 | |
| Valve train | Chain driven over head camshaft | |
| Oil Capacity | 3.7 US qt, 3.1 Imp. pt | 3.5 liter |
| Lubrication System | Forced pressure and dry sump | |
| Cylinder head compression | 170.7 psi, 12 kg/cm2 | |
| Intake Valve Open | At 5º before top dead center | |
| Intake Valve Close | At 30º after bottom dead center | |
| Exhaust Valve Open | At 35º before bottom dead center | |
| Exhaust Valve Close | At 5º after top dead center | |
| Valve Tappet Clearance | Intake: 0.002in./0.05mm | Exhaust: 0.003in./0.08mm |
| Idle speed | 950 rpm | |
| Carburetor | ||
|---|---|---|
| Type | Piston Valve | |
| Setting mark | 7A | |
| Main jet | #120 | |
| Idle jet | #40 | |
| Air screw opening | 1+-3/8 turns | |
| Float height | 0.866 in., 26mm | |
| Drive Train | ||
|---|---|---|
| Clutch | Wet, multi plate type | |
| Transmission | 5-speed, constant mesh | |
| Primary reduction | 1.708 | |
| Gear ratio I | 2.500 | |
| Gear ratio II | 1.708 | |
| Gear ratio III | 1.333 | |
| Gear ratio IV | 1.097 | |
| Gear ratio V 0.939 | ||
| Final Reduction | 2.667, drive sprocket 18T, driven sprocket 48T | |
| Gear shift pattern | Left foot operated return system | |
| Electrical | ||
|---|---|---|
| Ignition | Battery and ignition coil | |
| Starting system | Electrical motor or kick pedal | |
| Alternator | Three phase A.C. generator 12V/0.21kW@5,000 rpm | |
| Battery Capacity | 12V - 14AH | |
| Spark plug | NGK D8ES-L, NDX 24ES | |
| Headlight | Low/high 12V 40W/50W | |
| Tail/stoplight | Tail/stop 12V 7W/23W (SEA Trade No. 1157) | |
| Turn signal light | Front/rear 12V 23W/23W | |
| Speedometer light | 12V 3W | |
| Tachometer light | 12V 3W | |
| Neutral indicator light | 12V 3W | |
| Turn signal indicator light | 12V 3W | |
| High beam indicator light | 12V 3W | |