Derbi engine technical specs

Ok guys. Im really sick of the misinformation going around on this forum.

There are 3 types of derbi moped motors made.

Piston port engines

cylinder inducted

stroke: 43mm

bore: 38mm

displacement: 48.7cc

compression 8.5:1

direction of rotation: counter clockwise facing magneto

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

before some of you get all uppity, I copied that out of the repair manuals for all 3 motors except the pyramid reed which is off an old promotional ad I have.

Re: Derbi engine technical specs

🇮🇹💦 Of the Loin /

vic why is flat reed have a max rpm?

i have a flat reed engine and i do not like this news.

Re: Derbi engine technical specs

thanks vic. now everybody . now everybody sing it with me . flat reed will not work on your puch!!!! without a lot of work .

Re: Derbi engine technical specs

It is pretty damn close to working on your peugeot though.

Re: Derbi engine technical specs

haha.

Re: Derbi engine technical specs

maitland, I'm fairly certain that is the max rpm from a stock setup. with a kit/porting/bigger carb that would probably increase substantialy.

Re: Derbi engine technical specs

Campeona del Moped Mundo...everthing else is cocktail fun...BW1

Re: Derbi engine technical specs

so whats the best for performance? I have not played with mine yet but hav a good source for parts.

Fred

Re: Derbi engine technical specs

The Moped Victionary!

Re: Derbi engine technical specs

Flat reed engines have the most potential for obvious reasons but they can all be made to go very fast.

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