500T info please

See if you can find the P.LGarratt Norton Motorcycles, book as this covers the 500T models. The 5th edition is from 1948 to 1962. It was published by C. Arthur Pearson Ltd, and you can find them at auto-jumbles. Garratt was the Norton service manager at Bracebridge Street. The tappet clearance according the the Garrett book, was NIL inlet and exhaust, with the push rods free to rotate. 

Hi Gary,
The 500T engine is an ES2 with aluminium barrel and head. All settings are identical to model18/ES2. I have attached a photo of the data page from an original instruction manual.
Hope this helps.
Regards,

Alan

I forgot to say, points gap is .0012" for BTH TT mag or 0012"- 0015" for Lucas 
Regards,

Alan

Hi Gary,

   The valve timing for 500T, ES2 and Model 18 are all the same and are..... exhaust opens 70 degrees before bottom dead centre ( BBDC ) closes 30 after top dead centre ( ATDC ). Inlet opens 30 BTDC, closes 70 ABDC. This gives a good all-round performance but if you want an engine that is more tractable at low revs you can reduce the over-lap from 60 degrees to 50 by changing the timing to 75/25 25/75 although this will reduce power at the top end. To get these figures you will probably need the earlier 3 slot half time pinion, and they will not be exactly spot-on.
   The ignition timing listed at 5/8" BTDC equates to 45 degrees fully advanced, but this may need a slight adjustment to suit modern E10 petrol. Don't over-tighten the head bolts as the aluminium barrel will expand more than the cast iron one does, so 40 ft/lbs should be enough.