Engine numbers prefix

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pierodn

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Nov 10, 2012
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Hi All,
first i wish you a Merry Christmas and an happy new year.
Please, i need your help.
I have some problem with ASI (an italian committee for hystorical veichles) to obtain the certification for the italian MOT.
I send them the pictures of two bikes of mine, particulary to see the frames and engines numbers of:
20M3S/14669X;
20796X.
Happens that ASI ask me a picture where they can see the prefix (20M3S/) of the 207697 (like 146690).
We all know that only from 1967 to 1971 the Norton Commando had the prefix 20M3/ or 20M3S/ and that from 1972 to 1975 the engines didnt have any prefix.
Asked to the NOC a letter that can explain and clearify such misunderstanding.
In the meantime where i can copy some nees to send to ASI?.
Stay all safe and well.
Best regards.
Piero

Inviato da iPhone
 
pierodn said:
Hi All,
first i wish you a Merry Christmas and an happy new year.
Please, i need your help.
I have some problem with ASI (an italian committee for hystorical veichles) to obtain the certification for the italian MOT.
I send them the pictures of two bikes of mine, particulary to see the frames and engines numbers of:
20M3S/14669X;
20796X.
Happens that ASI ask me a picture where they can see the prefix (20M3S/) of the 207697 (like 146690).
We all know that only from 1967 to 1971 the Norton Commando had the prefix 20M3/ or 20M3S/ and that from 1972 to 1975 the engines didnt have any prefix.
Asked to the NOC a letter that can explain and clearify such misunderstanding.
In the meantime where i can copy some nees to send to ASI?.
Stay all safe and well.
Best regards.
Piero

Inviato da iPhone
Click to expand...
Look at the Mk IV note - http://www.tioc.org/partsbooksnorton/Norton-Motor Number Info.pdf

and https://www.norvilmotorcycle.co.uk/engrange.htm
 
Also look at page 5 - http://www.billymegawatt.com/uploads/6/8/4/6/6846461/norton_750cc_service_notes.pdf

142,534 Mk II ROADSTER, Mk 111 FASTBACK, same 4:10 tyres on both wheels. Fork gaiters and F/bed type yokes dropped, bare chrome stanchions introduced. Lucas h/bar lever switches introduced and indicators. Centre stand mounted on g/box Shock absorber fitted in rear wheel. Jan, '72 Consecutive engine numbers which had continued since W.W. II abandoned. New system and numbers introduced.

200,001 FASTBACK Mk. IV, ROADSTER Mk. IV. New crankcase castings, with breather behind c/case (not from end of camshaft). First double roller main bearings.
 
Just tell the idiots to google 1972 Norton Commando engine numbers or engine cases for pictures galore of no prefix.
The Internet never lies.
 
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