1971 Moby 40V Decompression Cable

Running Dog /
runningdog
Oct 23, 2019 04:24PM

Greetings, all; first post, first moped....

I am replacing all the cables (thanks Treatland), and am having problems with the decompression cable....I cannot understand how the outer cable can be rigid enough to push on the decompression valve, when the routing of the cable includes bends.

Seems like there should be a preload on the valve, which, when the bar control is activated, would open the valve...the default cable position would be in stress, like a British choke.

Thanks, in advance, for any help, or even funny comments.

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Re: 1971 Moby 40V Decompression Cable

Stephen Keller /
keller_stephen
Oct 24, 2019 03:38AM

I always assumed it pulled the valve out, not pushed it in. Never looked! :D

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Re: 1971 Moby 40V Decompression Cable

pat splat /
ggspeed
Oct 24, 2019 07:10AM

cables cables cables, stare at it for a while and it'll make sense. the sheathing looks plastic but is actually metal sprung and rigid but flexible

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Re: 1971 Moby 40V Decompression Cable

Rebel Moby /
rebelmoby
Oct 24, 2019 10:21AM

On the Moby decomp valve the sheath of the cable pushes on the shepherds hook and the bullet of the cable is under a fixed anchor. The shepherds hook is actually the spring that keeps the valve closed, pushing it down takes the spring pressure off the valve so it opens.

> Stephen Keller Wrote:

> -------------------------------------------------------

> I always assumed it pulled the valve out, not pushed it in. Never

> looked! :D

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Re: 1971 Moby 40V Decompression Cable

Richard Eberline /
rockettman
Oct 24, 2019 11:09AM

You need a step down bushing, see Myrons Moped.

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Re: 1971 Moby 40V Decompression Cable

Running Dog /
runningdog
Oct 24, 2019 04:01PM

Still have the stepped bushing in place. Cannot fathom how the cable housing and attached upstream bits have enough oomph to push down on the shephards hook. I've gotta really lean on a screwdriver placed on the shephards hook to get the valve to open.

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Re: 1971 Moby 40V Decompression Cable

Rebel Moby /
rebelmoby
Oct 25, 2019 10:26AM

YEP - those springs are tight - there is a lot of mechanical advantage in the geometry of the lever.

> Running Dog Wrote:

> -------------------------------------------------------

> Still have the stepped bushing in place. Cannot fathom how the cable

> housing and attached upstream bits have enough oomph to push down on the

> shephards hook. I've gotta really lean on a screwdriver placed on the

> shephards hook to get the valve to open.

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Re: 1971 Moby 40V Decompression Cable

Ken F /
drken
Oct 31, 2019 08:45PM

I have the same question and it confuses me. Anyone have a photo or a video?

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Re: 1971 Moby 40V Decompression Cable

Ken F /
drken
Oct 31, 2019 08:56PM

Or is there a page on decomp valve adjustment for Moby?

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