| Line 29: | Line 29: | ||
===Flat reed engines=== | ===Flat reed engines=== | ||
| + | flat reed engines were completely redesigned from the earlier piston port/pyramid reed engines. They are not directly swappable to older bikes. Flat reed engines come stock with a 6 roller variator which accepts standard 16x3 variator weights. Flat reed motors also use cast aluminum rear pulleys instead of the stamped steel version on older engines. | ||
| + | |||
*Crankcase 2-reed valve induction with triple transfer port distribution | *Crankcase 2-reed valve induction with triple transfer port distribution | ||
*stroke: 40mm | *stroke: 40mm | ||
| Line 35: | Line 37: | ||
*compression: 10:1 | *compression: 10:1 | ||
*direction of rotation: clockwise facing magneto. | *direction of rotation: clockwise facing magneto. | ||
| − | *Max engine RPM: 6500 | + | *Max engine RPM: 6500 (stock configuration) |
| − | *Flywheel | + | *Flywheel and Clutch bell nuts are '''reverse thread''' |
| + | |||
| + | 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. | ||
Revision as of 04:13, 29 November 2009
Engine Intake Info
- 'some late 85's, 86's and '87 SLE should be a flat reed engine (the flat reed engine came into play in late '85)
- If the engine and swing arm move with the suspension, it is a flat reed
- If the motor is rigidly attached to the frame 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
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
flat reed engines were completely redesigned from the earlier piston port/pyramid reed engines. They are not directly swappable to older bikes. Flat reed engines come stock with a 6 roller variator which accepts standard 16x3 variator weights. Flat reed motors also use cast aluminum rear pulleys instead of the stamped steel version on older 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 (stock configuration)
- Flywheel and Clutch bell nuts are reverse thread
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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