Yamaha RD80LC: history, specs, pictures

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Yamaha RD80LC
Manufacturer Yamaha
Also called RD 80 LC
Production 1982
Engine single cylinder, two-stroke
Bore / Stroke 49.0mm x 42.0mm
Top speed 80 mph (128 km/h)
Horse Power 9.79 HP (7.3 KW) @ 8500RPM
Torque 0.66 ft/lbs (0.9 Nm) @ 7500RPM
Fuel system carburetor. mikuni vm18
Ignition type cdi
Battery 7.1:1
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)
Dimensions L 0.04 inches (1 mm)
W 26.97 inches (685 mm)
H 0.04 inches (1 mm)
Seat height 30.12 inches (765 mm)
Weight 171.96 pounds (78.0 Kg)
Fuel capacity 2.64 Gallon (10.00 Liters)
Competition Kawasaki AR80
Manuals Service Manual
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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