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by paul.jameson
Thu Apr 16, 2020 8:53 pm
Forum: Ariel Talk
Topic: Telescopic Fork Geometry
Replies: 21
Views: 2149

Re: Telescopic Fork Geometry

Dammit David, you are right again! I have just been back out to the workshop to measure the yokes I have and it is definitely 7 5/8" late type, 7 3/8" early type. What I failed to realise was that I still had an early bottom yoke on the shelf. Does anyone need one?
by paul.jameson
Thu Apr 16, 2020 8:44 pm
Forum: Ariel Talk
Topic: Expensive Solex carb
Replies: 11
Views: 654

Re: Expensive Solex carb

I had a trip out on the 1937 Square today (for exercise, as its like riding a horse, riding a rigid Ariel because you have to take weight with your knees to avoid the bumps) and the bike is transformed after the carb modification suggested by Jens Beusse at the Annual Rally last year. So if you can ...
by paul.jameson
Thu Apr 16, 2020 8:38 pm
Forum: Main Chat Forum
Topic: Daily Fixing and Riding Diary on an Ariel 2020
Replies: 274
Views: 15228

Re: Daily Fixing and Riding Diary on an Ariel 2020

Well done Steve - she looks fine. But you are getting slower with the rebuilds these days. Start worrying when it takes you more than 4 years which is what my last two have taken me.
by paul.jameson
Wed Apr 15, 2020 8:49 pm
Forum: Four stroke
Topic: SQ4 Mk2 starting issues
Replies: 38
Views: 1806

Re: SQ4 Mk2 starting issues

I know Geoff Brown is running a 6 volt conversion on his S/A Square with Mk II engine but I also know that the conversion cost more than the brand new distributor complete with electronic ignition on my Healey. On the other hand, Geoff's system is easy to time and mine is an absolute swine but havin...
by paul.jameson
Wed Apr 15, 2020 8:36 pm
Forum: Ariel Talk
Topic: Expensive Solex carb
Replies: 11
Views: 654

Re: Expensive Solex carb

Just a bubble I think. One went on Ebay last year for well under £200 if I remember correctly.
by paul.jameson
Tue Apr 14, 2020 8:59 pm
Forum: Four stroke
Topic: Adjuster nut
Replies: 5
Views: 279

Re: Adjuster nut

To check I tried a 3/8" nut on the adjuster on my Red Hunter. It pushed straight on so the bolt has to be 5/16". I know the bolt is a different length between rigid/plunger and swinging arm but the thread (and nut) is the same throughout.
by paul.jameson
Tue Apr 14, 2020 8:52 pm
Forum: Four stroke
Topic: SQ4 Mk2 starting issues
Replies: 38
Views: 1806

Re: SQ4 Mk2 starting issues

The Mk II with SU carb is usually very, very easy to start. One thing which can upset this is a sticking dashpot. Try taking off the air cleaner, putting your finger down the inlet tract and seeing if the slide will move up and down totally freely. Do this with the choke off so there is no danger of...
by paul.jameson
Tue Apr 14, 2020 8:29 pm
Forum: Four stroke
Topic: Adjuster nut
Replies: 5
Views: 279

Re: Adjuster nut

It should be 5/16 x 26 tpi CEI. If you are at 3/8" then I suspect someone has made one up. ACME should be able to supply one.
by paul.jameson
Tue Apr 14, 2020 8:04 pm
Forum: Ariel Talk
Topic: Making the 650 HunterBird
Replies: 67
Views: 2560

Re: Making the 650 HunterBird

I am surprised at the problem with the petrol tank mounting. Son Rob has changed from a centre bolt tank to a fluted type without problems on his VH. Using the fluted tank, there is always the issue of tank rubber thicknesses to deal with and this can be far from straightforward.
by paul.jameson
Tue Apr 14, 2020 7:51 pm
Forum: Ariel Talk
Topic: Telescopic Fork Geometry
Replies: 21
Views: 2149

Re: Telescopic Fork Geometry

Wide fork centres are 7 3/8". They are visibly different from the narrow ones. See my article on the subject in Cheval from 26 years ago ! Incidentally, the "good authority" quoted in the article was the late Frank Wilkins.

Front fork article Cheval Feb 1994.jpg

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