For Sale: Heavy duty Doppler pipe for motobecane


New exhaust PUSH spring system designed and tested by Melvin on his Motobecane Av10 polini 50cc ripper.

With that system no more broken PULL springs due to strong vibrations from your  kitted engine.

It even comes with an extra set of longer screws if you install the header extension spacer for lower rpms or bigger volume 70cc kits.

The pipes are brand new and come with the ball joint and all the hardware still in the plastic bag.

No more “secret feature”, Melvin’s special springs system is now available for your fast moby.

To order email Christophe at

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