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by paul.jameson
Thu Jun 25, 2020 7:22 pm
Forum: Four stroke
Topic: My Sq 4 hates me!
Replies: 6
Views: 364

Re: My Sq 4 hates me!

I haven't had this happen on a Mk I / Mk II but I have had it several times on the Cammy, seen (and sorted) it on someone else's 4G and even had the armature shaft shear on the magneto of the Red Hunter. On the Cammy / 4G you learn quickly what to look for. The Red Hunter one baffled me for ages.
by paul.jameson
Thu Jun 25, 2020 7:16 pm
Forum: Four stroke
Topic: Iron 4G Head Question.
Replies: 6
Views: 219

Re: Iron 4G Head Question.

From the description you give, I would be tempted to leave well alone. The rocker box will not crack due to differential expansion because the holes around the valve guides are bigger than the external diameter of the guides. If you take the guides out, you will cause a degree of wear in the holes i...
by paul.jameson
Tue Jun 23, 2020 2:20 pm
Forum: Four stroke
Topic: Air filter on a Solex carb?
Replies: 9
Views: 326

Re: Air filter on a Solex carb?

Remaining photos follow:

IMG_4214.JPG


IMG_4216 lowres.jpg


The two photos which have bits of drawing on them (1 on this post, one on the previous post) are both high resolution so that you have a chance of reading the drawings. The other photos are low resolution.
by paul.jameson
Tue Jun 23, 2020 2:17 pm
Forum: Four stroke
Topic: Air filter on a Solex carb?
Replies: 9
Views: 326

Re: Air filter on a Solex carb?

I regret to say that the drawing I did of the 1952-53 Solex Carb Air Filter has been safely filed - somewhere. I have found the photos though, which show parts of the drawing so may be of use to people. IMG_4213.JPG IMG_0104.JPG IMG_4210 lowres.jpg IMG_4211 lowres.jpg IMG_4212 lowres.jpg Other photo...
by paul.jameson
Fri Jun 19, 2020 8:45 pm
Forum: Four stroke
Topic: Air filter on a Solex carb?
Replies: 9
Views: 326

Re: Air filter on a Solex carb?

Allan, If you would care to PM me your email address I will send you the drawing I have (if I can find it that is) of the air filter used by Ariel on the Squares in 1952/53. The bell housing was replaced by a flanged inlet tube to which a rubber hose was connected with its other end connected to the...
by paul.jameson
Fri Jun 19, 2020 8:39 pm
Forum: Four stroke
Topic: Solex AHD26 carb jets
Replies: 15
Views: 287

Re: Solex AHD26 carb jets

As Chris says, there should not be a float bowl gasket fitted. The (almost) square gasket with a screw hole in each corner is a critical item, made of paper. You need the small slot in it as described in an earlier post when someone (Paul Linden perhaps?) was finding his Solex so much trouble that h...
by paul.jameson
Fri Jun 19, 2020 8:32 pm
Forum: Four stroke
Topic: Rear rim off-set?
Replies: 5
Views: 204

Re: Rear rim off-set?

All Ariel wheels are built centrally, apart from the rear wheel on a pushrod Square Four. But, if you build a pushrod Square Four in a swinging arm frame, the wheel is built centrally. Offsets, which are commonly quoted from the face of the brake drum, vary depending on the width of the rim in use. ...
by paul.jameson
Thu Jun 18, 2020 8:32 pm
Forum: Four stroke
Topic: Solex AHD26 carb jets
Replies: 15
Views: 287

Re: Solex AHD26 carb jets

It is the auxiliary air bleed, size 150 (=1.5mm), according to Jens Beusse in the information on Solex carbs which he sent me last autumn.
by paul.jameson
Thu Jun 18, 2020 9:43 am
Forum: Forum Help
Topic: ariel square four mk2
Replies: 7
Views: 289

Re: ariel square four mk2

I have a Powerspark (= Accuspark?) distributor on my Healey Square Four which was difficult to time but is now working well.

Leon - I have sent you a Private Message.
by paul.jameson
Tue Jun 16, 2020 7:30 pm
Forum: Four stroke
Topic: Rear brake arm springs
Replies: 9
Views: 302

Re: Rear brake arm springs

I hit a similar problem on the RH500 last year when the spring broke. It had lasted only about 80 years. Given the limited availability of springs in the workshop, the easy answer was to drill another hole in the backplate.

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