Nortons - General

Hello,

I have recently aquired a Magnesium AMC Gearbox shell,

Im assuming its a Quaife but also came with a "Petty PGT" Front cover so im not sure, I know Summerfield made the boxes for Petty but dont recall seeing a Manesium one

Can anyone explain the numbers stamped on the rear of the crankcase? Just around from where the engine number is. It begins with the letter 'T'.  Here is a picture 

Can someone tell me the best ball valves (8mm) to go in the oil tank feed to the engine in most of these old British twins - to prevent wet sumping? 
Thank you.

My first time rebuilding a 1967 Atlas motor. Have rebuilt a number of Triumph and Enfield engines and each of these have “must do” mods to overcome original design flaws, upgraded seals, bearings, oil pumps etc.

Hello  and good morning  just wondering if March issue  has been sent as yet I don't  seem to have  the latest copy  many thanks  dave in wet Hampshire 

Can anyone tell me the dimensions of the rubber sealing strap which goes around the inner chaincase, and whether the rubber is relatively hard or soft?

My buddy saw this pic on facebook, and thought I’d like it.

The speedo in my 57 Dominator 99 (mph) is marked  1550,   S467/203N.

Is it the correct one?

I haven't checked it against another vehicle yet, but I have the feeling it is reading too fast.

Can anyone tell me the exact sizes for the two oil seals, gearbox drive side outer and engine crank shaft drive side? For my 57 Dominator.

Hello, new member and first post so hopefully right forum.