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by john.bebb
Thu Sep 03, 2020 12:22 am
Forum: Four stroke
Topic: ariel square four mk2
Replies: 10
Views: 1273

Re: ariel square four mk2

Hi Allen - d'ya get your timing sorted? - as far as "engineering" - if you want top quality engineered motor machining then use Thomas Hamlin, based in Somerset which is a pain but absolute dog's dangly bits... (Andy BigVee knows his Sq4s)... but they're not a ride in & fix it establis...
by john.bebb
Mon Jul 20, 2020 8:28 pm
Forum: Ariel Talk
Topic: Someone to overhaul a sq4 cylinder head
Replies: 1
Views: 493

Re: Someone to overhaul a sq4 cylinder head

Hi Federico; - I understand you may actually be based in Spain - surely there must be competent engine machine shops in Spain... but if you're in UK, (or determined to have the work in the UK); - then I would surely recommend Hamlins (Somerset) http://www.hamlinsengineering.co.uk or Middlesex Rebore...
by john.bebb
Mon Jul 20, 2020 2:28 pm
Forum: Four stroke
Topic: Angle BTDC - ignition setting
Replies: 16
Views: 1273

Re: Angle BTDC - ignition setting

An explanation of the Conrod. I am somewhat bemused that persons who seemingly may consider themselves to be (motorcycle) “mechanics” appear to have so little understanding of true mechanics in the real world. A conrod is a rigid linkage lever that transfers linear motion into angular (rotational) m...
by john.bebb
Sun Jul 05, 2020 5:53 am
Forum: Four stroke
Topic: Angle BTDC - ignition setting
Replies: 16
Views: 1273

Re: Angle BTDC - ignition setting

Hey guys - resolution to your issues is simple trigonometry of arcs... You don't even need to do the maths... (you just gotta know and when to divide or multiply by 2) https://handymath.com/cgi-bin/arc18.cgi Enter into "Radius of Arc" (set units @ mm) 85 (i.e. Stroke spec. of NH 350) &...
by john.bebb
Wed Jun 24, 2020 2:05 pm
Forum: Four stroke
Topic: Squre Four Engine Breather
Replies: 10
Views: 593

Re: Squre Four Engine Breather

Hi Graham 1/ There is a breather in the crankcase - it expires through the timing chest... just as any fluid will "find it's own level" and equalize, similarly gases behave in exactly the same way with respect to pressure & volume - if you put your tyre to say 30psi - that is per squar...
by john.bebb
Wed Jun 24, 2020 1:33 pm
Forum: Four stroke
Topic: My Sq 4 hates me!
Replies: 6
Views: 617

Re: My Sq 4 hates me!

Perhaps you should cease talking to it as a cantankerous old hag or a spoilt teenage super bitch - treat it merely like the inanimate lump of metal & sundries that it is & book yourself in for a couch session with your local trick cyclist...
by john.bebb
Wed Jun 24, 2020 1:25 pm
Forum: Four stroke
Topic: Which oil pipes square four
Replies: 3
Views: 294

Re: Which oil pipes square four

Correct statement from Pete, thank you! - but note such is ONLY true for the iron 4g - the ally Mk1 requirement is the large bore is the rocker feed.
(info c/o Bruce Longman).
by john.bebb
Wed Jun 24, 2020 1:16 pm
Forum: Four stroke
Topic: Iron 4G Head Question.
Replies: 6
Views: 410

Re: Iron 4G Head Question.

Hi John; - I have no experience of the iron head but much with my ally Mk1's. I cannot really advise; - it's up to you to as to whether to risk damage by fully stripping to inspect & service or to leave & risk motor damage due to historic carboned oil crud & rust. Personally since the mo...
by john.bebb
Thu Jun 18, 2020 9:23 am
Forum: Four stroke
Topic: mk1 square four . oil issues
Replies: 39
Views: 2325

Re: mk1 square four . oil issues

Hi Folks, Oil pipe sizes; - rockers & pressure guage on a Mk1 I am well aware there is contention here - so I checked it out with Bruce Longman (probably the most knowledgeable gent wrt Squares) It is DEFINATELY the Large bore to Rockers & the Small bore to the Pressure guage! (Apparently th...
by john.bebb
Wed Jun 10, 2020 3:22 pm
Forum: Four stroke
Topic: SQ4 Mk2 starting issues
Replies: 38
Views: 2560

Re: SQ4 Mk2 starting issues

Hi Bernie, please beware - ancient carb materials were not designed to be ethanol proof - (ethanol can leech Mazac & other alloys). Deposition within jets etc will surely occur after a months or so of dormancy. Some years back the Government deigned to warn us when UK petrol was destined to be l...

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