I am -also- puzzeld by a 'negative vacuum' ehhhh, No vacuum ?
The yam reed valve lets air out on the downstroke and closes on the upstroke.

But, Ariel only changed something to their engines if it was benificial.
So one can assume the 2 Oclock hole is there for a reason.
If a reed valve would add ...

underside

I believe that the number 2629 stamped in it should correspond with the crankcase halves numbers on the underside of the crankcase.
I used to have a Ariel that had these numbers matching.
If they dont match it is ofcourse not a problem as Ariel made this engine basically for decades!

Hello Albert,
I think the housing you have is possibly correct for the year of your Ariel.
That because it's rather 'square' along the curved top line .
Later ones were more rounded off there.
Did 1934 sidevalves have a oil gauge? if not yours could be from a sidevalve ?

If you want to go drilling ...

Hi Simon, No I did not -yet-

Hi Dave, I have the cage & rollers.

Hi Roger, .........cliff hanger ?

Thanks !

Wanted:

This thing :

Bridges the GB gearbox mainshaft and clutch centre.

Thanks!

maybe rename this thread:

Bodges we have found in our family

- No Connection-
I think seller lives/works in the Netherlands.

For those who need to have something on hand this winter :lol:


Hi
Not complette
engine rotate freally
Posibly transport
Location Poland
https://www.marktplaats.nl/v/motoren/motoren-oldtimers/m2451788574-ariel-w-ng

Schermopname_14 ...

Well, what can I say........
there are much favored in law ones and there are those that you really wonder about;
How the heck did I get lumbered with that one

Latest barn find, I think this welding job was a way to fit a single seat to this swingarm frame.
I did not yet figure out what the vertical piece of tubing on the right hand side was meant for.
And why not fix that wobbling toolbox for once and for all !