Re: Motobecane D55 Motor Teardown

Dirty30 Dillon /
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Keeping with the ignition, here is a better photo of the internals. Everything is MUCH nicer and newer than any AV7 I have worked on. Big Ole condensor that is bolted down upside down with a special tract that the wire follows to avoid being chewed up.

IMG_20200414_192240.jpg

Onto the cylinder. It's a standard motobecane stud pattern, and the cylinder has somem very nice porting, if a little conservative on the exhuast side of things. The biggest thing is look at these massive case transfers!

IMG_20200414_192600.jpg

I don't really know what they were thinking with these. They are absolutely massive. The outstripe the transfers in my Vespa Sacre cases by 25%.

In comparison, I've outlined the case transfers onto the already very large cylinder transfers.

IMG_20200414_192553.jpg

At this point, I am not sure what my plan is for re-assembly of the top end. That bottleneck is a SEVERE interruption in the flow of the transfers, but I don't think that I want to try and match the cylinder to the cases. Mostly because their is no material backing the portion above the stock ports, so my work would have to be very shallow to avoid blowing through. I may go this route, or look into a bigger displacement cylinder.

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Motobecane D55 Motor TeardownTopic by: Dirty30 Dillon Dirty30 Dillon 04/15/20 09:50AM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 04/15/20 10:05AM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 04/15/20 10:36AM
  Re: Motobecane D55 Motor TeardownRe: P D P D 04/15/20 11:35AM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 04/15/20 12:33PM
  Re: Motobecane D55 Motor TeardownRe: P D P D 04/15/20 12:48PM
  Re: Motobecane D55 Motor TeardownRe: Rebel Moby Rebel Moby 04/19/20 12:19PM
  Re: Motobecane D55 Motor TeardownRe: Brandon Weiss (Detective brandon to you) Brandon Weiss (Detective brandon to you) 04/20/20 09:36AM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 04/20/20 10:11AM
  Re: Motobecane D55 Motor TeardownRe: Ian T Ian T 04/30/20 02:07PM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 04/30/20 02:12PM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 05/19/20 09:46AM
  Re: Motobecane D55 Motor TeardownRe: P D P D 05/19/20 10:45AM
  Re: Motobecane D55 Motor TeardownRe: Brandon Weiss (Detective brandon to you) Brandon Weiss (Detective brandon to you) 05/20/20 01:26PM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 05/21/20 10:47AM
  Re: Motobecane D55 Motor TeardownRe: Brandon Weiss (Detective brandon to you) Brandon Weiss (Detective brandon to you) 05/21/20 12:23PM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 06/15/20 10:09AM
  Re: Motobecane D55 Motor TeardownRe: Brandon Weiss (Detective brandon to you) Brandon Weiss (Detective brandon to you) 06/15/20 12:12PM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 06/15/20 12:22PM
  Re: Motobecane D55 Motor TeardownRe: Rebel Moby Rebel Moby 06/15/20 10:20PM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 06/15/20 11:22PM
  Re: Motobecane D55 Motor TeardownRe: Dirty30 Dillon Dirty30 Dillon 06/18/20 01:01PM

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