Difference between revisions of "Derbi"

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*Max engine RPM: 6500
 
*Max engine RPM: 6500
  
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See a PDF file of the flat reed engine repair manual [http://mopedcentral.com/images/DerbiEngineRepair.pdf here].
 
==Make a Water-Cooled Derbi==
 
==Make a Water-Cooled Derbi==
 
Please see [http://www.mopedarmy.com/forums/discuss/read.php?f=7&i=52675&t=49558 this discussion] from the forums.
 
Please see [http://www.mopedarmy.com/forums/discuss/read.php?f=7&i=52675&t=49558 this discussion] from the forums.
  
 
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Revision as of 18:25, 2 March 2009

Engine Intake Info

  • '86 and '87 SLE should be a flat reed engine (the flat reed engine came into play in '86)
    • You can tell if it has a steel rear swingarm on a Variant step through, it is a flat reed
    • If it has an alloy rear swingarm, it's piston port or pyramid reed
  • the 81 SLE was pyramid reed
  • Derbi RD's were pyramid reed
  • Derbi Diablos and Lagunas piston port
  • the Derbi DS50 scooter is flat reed

-quote by well known derbi connoisseur

Technical Specs

Piston port engines

  • cylinder inducted
  • stroke: 43mm
  • bore: 38mm
  • displacement: 48.7cc
  • compression 8.5:1
  • direction of rotation: counter clockwise facing magneto

Download the repair manual for Derbi piston port motors here.

Pyramid reed engines

  • Pyramid 3-reed valve, Crankcase mounted
  • stroke: 43mm
  • bore: 38mm
  • displacement: 48.6cc
  • compression 8.5:1
  • direction of rotation: counter clockwise facing magneto.

Flat reed engines

  • Crankcase 2-reed valve induction with triple transfer port distribution
  • stroke: 40mm
  • bore: 39.87mm
  • displacement: 49cc
  • compression: 10:1
  • direction of rotation: clockwise facing magneto.
  • Max engine RPM: 6500

See a PDF file of the flat reed engine repair manual here.

Make a Water-Cooled Derbi

Please see this discussion from the forums.

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