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The Unofficial Yamaha CV80 Owner's Guide
Specifications
Engine Specifications
Chassis Specifications
Electrical Specifications
Torque Specifications
Quick Facts
| Description | CV80J |
| Overall Length | 1,750 mm (68.9 in) |
| Overall Width | 670 mm (26.4 in) |
| Overall Height | 1,020 mm (40.2 in) |
| Seat Height | 757 mm (29.8 in) |
| Wheelbase | 1,200 mm (47.2 in) |
| Ground Clearance | 110 mm (4.3 in) |
| Weight (with Oil and Full Fuel Tank) | 87 kg (191 lb) |
| Oil |
| Engine | Yamalube 2-stroke engine oil |
| Transmission | SAE 10W30 type SE motor oil |
| Engine oil tank | 1.1 L |
| Transmission | .018 L (periodic); .20 L (total) |
| Fuel |
| Type | Regular gasoline |
| Tank capacity | 4.7 L |
| Tire Pressure (Cold) |
| Solo Rider | 14 psi (Front); 22 psi (Rear) |
| With Passenger | 14 psi (Front); 36 psi (Rear) |
Engine Specifications
| Description | CV80J |
| Type | Air cooled two-stroke torque induction |
| Cylinder & Head |
| Arrangement | Forward incline, single |
| Displacement | 79 cm3 |
| Bore x Stroke | 49.0 x 42.0 mm |
| Taper Limit | 0.05 mm (0.002 in) |
| Out of Round Limit | 0.01 mm (0.0004 in) |
| Cylinder Head Warp Limit | 0.02 mm (0.0008 in) |
| Piston |
| Size/Measuring Point | 49 mm (1.93 in)/5 mm (0.2 in) |
| Clearance | 0.035 ~ 0.040 mm (0.0014 ~ 0.0016 in) |
| Oversize | 49.25 mm (1.94 in) 1st; 49.50 mm (1.95 in) 2nd |
| Offset | 0 mm/in |
| Clutch |
| Type | V-belt automatic centrifugal |
| Shoe Thickness | 2.5 mm (0.10 in) |
| Shoe Spring Free Length | 29.5 mm (1.20 in) |
| Transmission |
| Type | Constant mesh |
| Primary Reduction System | V-belt |
| Primary Reduction Ratio | 2.0 : 1 |
| Secondary Reduction Ratio | 9.7 : 1 |
| Gear Ratios | 52/18 (1st); 47/14 (2nd) |
| Main Axle Deflection Limit | 0.015 mm (0.00059 in) |
| Drive Axle Deflection Limit | 0.015 mm (0.00059 in) |
| Carburetor |
| Type (Quantity) | Mikuni VM13SS (1) |
| ID Mark | 5G301 |
| Main Jet | #110 |
| Air Jet | ø 2.5 |
| Jet Needle-clip Position | 3x5-2 |
| Needle Jet | D-8 |
| Cutaway | 2.5 |
| Pilot Jet | #50 |
| Air Screw Turns Out | 1¼ |
| Starter Jet | #45 |
| Valve Seat Size | ø 2.0 |
| Float Height | 14.5 ± 1 mm (0.57 ± 0.04 in) |
| Engine Idling Speed | 1,500 ± 50 RPM |
| Reed Valve |
| Thickness | 0.2 mm (0.008 in) |
| Valve Lift | 7.8 mm (0.31 in) |
| Bending Limit | 0.5 mm (0.02 in) |
| Autolube Pump |
| Colour Code | Yellow |
| Minimum Stroke | 0.30 ~ 0.35 mm (0.012 ~ 0.014 in) |
| Maximum Stroke | 0.95 ~ 1.10 mm (0.037 ~ 0.043 in) |
Chassis Specifications
| Description | CV80J |
| Frame Type | Steel tube underbone |
| Castor Angle | 27°30' |
| Trail | 64 mm (2.52 in) |
| Steering System |
| Bearing Type | Ball bearing |
| Number & Size of Steel Balls | 22 pcs x 3/16 in Upper; 19 pcs x 1¼ in Lower |
| Front Suspension |
| Type | Bottom Link Fork |
| Front Fork Travel | 55 mm (2.2 in) |
| Fork Spring Free Length | 170.5 mm (6.7 in) |
| Rear Suspension |
| Type | Unit swing |
| Shock Absorber Travel | 53 mm (2.1 in) |
| Spring Free Length | 214.5 mm (8.4 in) |
| Shock Absorbers |
| Type | Coil spring, oil damper (front and rear) |
| Wheels |
| Wheel Type | Disc, Front and Rear |
| Rim Size/Material | 10 x 2.50/Steel, Front and Rear |
| Rim Runout Limit | 2.0 mm (0.08 in) Vertical and Lateral |
| Travel | 55 mm (2.2 in) Front; 53 mm (2.1 in) Rear |
| Tires |
| Type | Tube Type, Front and Rear |
| Size | 3.50-10-4PR, Front and Rear |
| Brakes |
| Front | Drum brake, right-hand operation |
| Rear | Drum brake, left-hand operation |
| Drum Inside Diameter | 110 mm (4.3 in), Front and Rear |
| Lining Thickness/Limit | 4 mm (0.16 in)/2 mm (0.08 in) |
| Shoe Spring Free Length | 34.5 mm (1.36 in), Front and Rear |
Electrical Specifications
| Description | CV80J |
| Voltage | 6V |
| Ignition System |
| Type | CDI Magneto |
| Timing | 16° at 5,000 RPM, 1.8 ± 0.15 mm (0.07 ± 0.006 in) |
| CDI |
| Model | 13T/Yamaha |
| Pick up Coil Resistance (Colour) | 34 Ω ± 10% at 20° (White/Red-Black) |
| Charging Coil Resistance (Colour) | 37 Ω ± 10% at 20° (Black/Red-Black) |
| Ignition Coil |
| Model | C2T4 |
| Minimum Spark Gap | 13 kV or more at 400 RPM; 12 kV or more at 8,000 RPM |
| Primary Winding Resistance | 1.6 Ω ± 10% at 20° C |
| Secondary Winding Resistance | 6.6 KΩ ± 10% at 20° C |
| Charging System |
| Type | Flywheel magneto |
| Model | 13T/Yamaha |
| Charging Current (Night) | 1.0 A or more at 3,000 RPM |
| Charging Current | 3.5 A or less at 8,000 RPM |
| Charging Coil Resistance (Colour) | 0.6 Ω ± 20% at 20° C (White-Black) |
| Lighting Voltage | 6.5 V or less at 8,000 RPM; 7.7 V |
| Lighting Coil Resistance (Colour) | 0.5 Ω ± 10% at 20° C (Yellow-Black) |
| AC Regulator |
| Model | SU208Y/Stanley |
| No Load Regulated Voltage | 7.5 V |
| Allowable Amperage | 8.5 A |
| Rectifier |
| Model | DE4504/Stanley |
| Capacity | 4 A |
| Withstand Voltage | 400 V |
| Battery |
| Model | Yuasa 6N11-2D |
| Capacity | 6V, 11 AH |
| Specific Gravity | 1.280 |
| Electric Starter System |
| Type | Constant Mesh |
| Starter Motor | SM-7152.Mitsuba |
| Starter Motor Output | 0.15 kw |
| Brush Overall Length | 5.8 x 10.5 x 11 mm (0.228 x 0.413 x 0.433 in) |
| < Limit > | 5 mm (0.197 in) |
| Spring Pressure | 300 g (10.581 oz) |
| Commutator Dia | ø 23 mm (0.906 in) |
| < Limit > | 22 mm (0.866 in) |
| Mica Undercut | 0.55 x 1.8 mm (0.022 x 0.071 in) |
| Starter Switch | G2MW-D3654/Tateishi |
| Amperage Rating | 50 A |
| Coil Winding Resistance | 22 Ω ± 10% at 20° C (68° F) |
| Spark Plug |
| Type | NGK BP6HS |
| Gap | 0.6 ~ 0.8 mm (0.024 ~ 0.031 in) |
| Horn |
| Type (Quantity) | Plain (1) |
| Model | MF-6 |
| Maximum Amperage | 1.5 A |
| Flasher Relay |
| Type | Condenser |
| Model | FU637SD |
| Frequency | 85 cyles/min |
| Wattage | 17 W x 2 + 3 W |
| Oil Level Switch |
| Model | 5G3/Stanley |
| Fuel Gauge |
| Model | 5G34/Nipponseiki |
| Sender Unit Resistance | 7 Ω ± 5 Ω Full; 95 Ω ± 7.5 Ω |
| Bulb Wattage/Quantity |
| Headlight | 25W/25W x 1 |
| Tail/Brake Light | 5.3W/25W x 1 |
| Flasher Light | 17W x 4 |
| Meter/Pilot Lights | 3W x 5 |
| Auxillary Light | 4W x 1 |
| Circuit Breaker |
| Type | Fuse |
| Amperage for Individual Circuit/Quantity | 10 A x 1 Main; 10 A x 1 Reserve |
Torque Specifications
NOTE
To avoid warpage, tighten multi-fastener assemblies in a crisscross fashion in progressive stages until full torque is reached. Specifications assume clean, dry threads. Components should be at room temperature.
UNIT DEFINITIONS
N.m = Newton Meter | kgf.m = kilogram-force/metre | lbf.ft = pound-force/feet
Bolt Science Torque Converter
| Engine Part | Size | Pitch | Quantity | N.m | kgf.m | lbf.ft |
| Cylinder Head | M7 | 1.00 | 4 | 15 | 1.5 | 11.0 |
| Spark Plug | M14 | 1.25 | 1 | 15 | 1.5 | 11.0 |
| CDI Rotor | M12 | 1.25 | 1 | 15 | 1.5 | 11.0 |
| Magneto Base | M6 | 1.00 | 3 | 8 | 0.8 | 5.8 |
| Air Shroud | M6 | 1.00 | 7 | 8 | 0.8 | 5.8 |
| Fan | M6 | 1.00 | 3 | 8 | 0.8 | 5.8 |
| Oil Pump | M5 | 0.80 | 2 | 4 | 0.4 | 2.9 |
| Reed Valve | M6 | 1.00 | 4 | 8 | 0.8 | 5.8 |
| Muffler | M8 | 1.25 | 2 | 18 | 1.8 | 13.0 |
| Crankcase, Cover | M6 | 1.00 | 4,6 | 8 | 0.8 | 5.8 |
| Transmission Drain Bolt | M8 | 1.00 | 1 | 18 | 1.8 | 13 |
| Kick Crank | M6 | 1.00 | 1 | 10 | 1.0 | 7.2 |
| BCV Mount | M6 | 1.00 | 2 | 8 | 0.8 | 5.8 |
| Starter Motor | M6 | 1.00 | 1 | 8 | 0.8 | 5.8 |
| One-Way Clutch | M10 | 1.25 | 1 | 30 | 3.0 | 22.0 |
| Secondary Sheave | M36 | 1.50 | 1 | 50 | 5.0 | 36.0 |
| Chassis Part | Size | Pitch | Quantity | N.m | kgf.m | lbf.ft |
| Front Wheel Axle | M10 | 1.25 | 1 | 35 | 3.5 | 25.0 |
| Brake Cam Lever | M6 | 1.00 | 1 | 10 | 1.0 | 7.2 |
| Front Fender | M6 | 1.00 | 3 | 6 | 0.6 | 4.3 |
| Rear Mud Guard | M6 | 1.00 | 2 | 6 | 0.6 | 4.3 |
| Front Panel Guard | M6 | 1.00 | 4 | 6 | 0.6 | 4.3 |
| Steering Shaft | M8 | 1.25 | 1 | 34 | 3.4 | 24.0 |
| Steering Shaft¹ | M25 | 1.00 | 1 | 30 | 3.0 | 22.0 |
| Footrest Board | M6 | 1.00 | 4 | 6 | 0.6 | 4.3 |
| Engine Bracket, Frame | M10 | 1.25 | 2 | 42 | 4.2 | 30.0 |
| Engine Bracket, Engine | M12 | 1.25 | 1 | 75 | 7.5 | 54.0 |
| Fuel Tank | M6 | 1.00 | 4 | 6 | 0.6 | 4.3 |
| Rear Shock, Frame | M10 | 1.25 | 1 | 40 | 4.0 | 29.0 |
| Rear Shock, Engine | M12 | 1.25 | 1 | 50 | 5.0 | 36.0 |
| Carrier | M8 | 1.25 | 4 | 15 | 1.5 | 11.0 |
| Rear Wheel Axle | M14 | 1.50 | 1 | 95 | 9.5 | 68.0 |
| Rear View Mirror | M10 | 1.25 | 2 | 30 | 3.0 | 22.0 |
| Handle Upper Cover | M8 | 1.25 | 2 | 15 | 1.5 | 11.0 |
| Fuel Sensor | M5 | 0.805 | 4 | 2 | 0.2 | 1.4 |
| Front Shock, Upper | M8 | 1.25 | 1 | 26 | 2.6 | 19.0 |
| Front Shock | M10 | 1.25 | 1 | 50 | 5.0 | 36.0 |
| Footrest Brake | M8 | 1.25 | 4 | 15 | 1.5 | 11.0 |
¹ Not sure why this specification is repeated in the service manual.
DISCLAIMER
I make no warranty of any kind, either express or implied, including without limitation warranties regarding the accuracy, reliability or completeness of information on this site. Anyone using such information to perform repairs or mechanical work of any kind does so entirely at his or her own risk. In no event will I be liable for any incidental, consequential, or indirect damages.
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