Yamaha RD80LC: history, specs, pictures

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Yamaha RD80LC
Also called RD 80 LC
Production 1982
single cylinder, two-stroke
Bore / Stroke 49.0mm x 42.0mm
Top Speed 80 mph (128 km/h)
Horsepower 9.79 HP (7.3 KW) @ 8500RPM
Torque 0.66 ft/lbs (0.9 Nm) @ 7500RPM
Fuel System carburetor. mikuni vm18
Ignition cdi
Transmission Gear box: 6-speed

Final Drive: chain

Clutch: wet plate
Suspension Front: telescopic forks
Rear: yamaha monoshock
Brakes Front: single disc. single sliding piston caliper
Rear: expanding brake (drum brake)
Wheelbase 0.04 inches (1 mm)
Length 0.04 inches (1 mm)
Width 26.97 inches (685 mm)
Height 0.04 inches (1 mm)
Seat Height 30.12 inches (765 mm)
Weight 171.96 pounds (78.0 Kg) (dry),
Recommended Oil Yamalube 10w-40
Fuel Capacity 2.64 Gallon (10.00 Liters)
Competition Kawasaki AR80
Manuals Service Manual

The Yamaha RD80LC was a single cylinder, two-stroke standard produced by Yamaha in 1982. It could reach a top speed of 80 mph (128 km/h). Max torque was 0.66 ft/lbs (0.9 Nm) @ 7500 RPM. Claimed horsepower was 9.79 HP (7.3 KW) @ 8500 RPM.


The RD 80LC was the baby of the family, a bit cheeper to insure falling in to the sub 100cc group. It sold for just 2 years, It was not that popular a little spindly and when you could have the 125 for not a lot more wich had a big bike feel about it why go for the 80lc. Still quite a few did get sold and now days they are very rare to find and when you do come across one its usually a shed. They had a iron barrel not an alloy one like the rest of the family. Quite a few people put a 125lc lump in to the frame and they really did fly. I had a friend who did this after crashing his 125lc and picking up a shed 80lc for £100 he easily fitted the lump and everything over the weekend. It was so fast it left my MK2 125lc standing.


The engine was a oil & air cooled single cylinder, two-stroke. A 49.0mm bore x 42.0mm stroke result in a displacement of just 79.0 cubic centimeters.


The bike has a 6-speed transmission. Power was moderated via the wet plate.


Stopping was achieved via single disc. single sliding piston caliper in the front and a expanding brake (drum brake) in the rear. The front suspension was a telescopic forks while the rear was equipped with a yamaha monoshock. The RD80LC was fitted with a 2.64 Gallon (10.00 Liters) fuel tank. The bike weighed just 171.96 pounds (78.0 Kg). The wheelbase was 0.04 inches (1 mm) long.

Yamaha RD 80LC Specification[edit]

  • Introduced : March 1982 Discontinued : July 1984
  • Frame/ engine nos : 11A-000101
  • Colors : White or candy blue
  • Bore and stroke : 49mm X 42mm
  • Capacity : 79cc
  • Power : 10bhp
  • Gears : 6
  • Wheels : 18-inch front and rear
  • fuel capacity : 2.2 gallons
  • Speed : 65ish mph Standard
  • Weight : 180 lbs
  • MPG : 65/75