Derbi Variant Piston Port Specifications

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Engine

Specifications

  • Stroke: 43mm
  • Bore: 38mm
  • Displacement: 48.7cc
  • Compression 8.5:1
  • Rotation: CCW Facing Magneto

Transmission Oil

  • Capacity is 400cc (fill to the fill hole located under the pedal shaft)
  • SAE 80 EP (hard to find, do not use 80/90 that is gear oil)
  • SAE 20W50

Main Bearings

  • 17x40x12mm - 6203
  • 17x47x14mm - 6303

Main Seals

  • 17x28x6mm - Qty2

Case Bearings

  • 25x52x15mm - 6205
  • 15x42x13mm - 6302 (Watch out for cheap 6302 bearings, some come 16x42x13mm)

Case Seals

  • 16x24x4mm - Qty2
  • 15x30x7mm
  • 25x40x7mm

Carburetor

Stock Type

  • Dellorto 12/12

Jet Size

  • ? (probably somewhere in the 50s)

Ignition

Specifications

  • Motoplat
  • 6V 12-15W

Timing Advance

  • 1.8mm Before TDC (21 Degrees)

Point Gap

  • 0.35mm to 0.4mm

Spark Plug

  • NGK B7HS
  • Champion L82

Lighting

Bulbs

  • Headligh 6V 21W BA15s (1156)
  • Taillight 6V 5W BA15s (67)
  • Stoplight 6V 10W BA15s (67)
  • Speedo 6V 1.5W BA7s (3898)

Wiring Derbi variant wiring.jpg

Drivetrain

Belt

  • Dayco 8004

Variator Weights

  • 19.6mm x 14.375mm 10.5 Grams - Qty3

Chain

  • 415 Size
  • ? Links

Standard Front Sprocket

  • ? T

Standard Rear Sprocket

  • 30T

Variant Frame

Rear Shocks

  • 302mm Length

Headset Bearings

  • 3/16" loose ball bearings - Qty46
  • Bearing Services part #STL-3/16GR25

Spoked Wheel Bearings

  • 12x32x10mm - 6201-2RS - Qty4

Spoked Wheel Brake Pads

  • 105x20mm - Qty2
  • Tomos pads could fit with modification

Tires

  • 2.25" x 17"

Axle Size

  • 12mm