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...

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...

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...

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) &...

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...

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...

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).

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...

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...

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...