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#75750 - 07/10/08 3:00 pm Norton Identification please  
Joined: Dec 2006
Posts: 208
TBolt72 Offline
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TBolt72  Offline
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Glenwood, Iowa USA
I just bought partial parts bike what I believe to be a 73 Norton Commando 750. VIN 220030. Date stamp 1/73. I cant seem to find any identification for Nortons on the web. Thanks

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#75751 - 07/10/08 3:19 pm Re: Norton Identification please  
Joined: Sep 2007
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gory Offline
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gory  Offline
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Rocky Mount VA

#75752 - 07/10/08 3:48 pm Re: Norton Identification please  
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TBolt72 Offline
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TBolt72  Offline
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Glenwood, Iowa USA
No, thats for 850 frames. Mine is a 750. Found one though, looks like its a 73. Not sure what model though.

#75753 - 07/10/08 4:54 pm Re: Norton Identification please  
Joined: Aug 2001
Posts: 2,479
Richrd Online content
Richrd  Online Content


Joined: Aug 2001
Posts: 2,479
Springfield Nebraska
All Commando frames were "Commando".

The only models (other than fastback) were roadster and interstate, and that was just the sheet metal that was put on at the end.


Rich (member ThreeMustGetBeers)
"It's not always about going fast. Sometimes it's nice to slow down" (Wendy E.2016)

69 bonney
72 commando
75 commando interstate
06 Suzu..Suzu.. uh appliance
couple of beesas a ducati
and the Snake Bike
#75754 - 07/10/08 5:20 pm Re: Norton Identification please  
Joined: Feb 2005
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Tom Sanders Offline
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Tom Sanders  Offline
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Posts: 623
Winter Springs, FL
Try this link:

http://www.norvilmotorcycle.co.uk/

click on "identify your bike"


LONG LIVE LOCKTITE

74 Roadster 880cc
1962 Norton 650SS
75 Ducati 860GT
1968 Commando Fastback SN 126157
1975 Honda CB400f AHRMA racer #842
email addy: sargehopp@gmail.com
#75755 - 07/10/08 7:08 pm Re: Norton Identification please  
Joined: Mar 2006
Posts: 3,469
L.A.B. Online content
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L.A.B.  Online Content
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Joined: Mar 2006
Posts: 3,469
Norfolk, UK
Quote:
Originally posted by TBolt72:
I just bought partial parts bike what I believe to be a 73 Norton Commando 750. VIN 220030. Date stamp 1/73.
It is a "750 Mk V" (1973) Commando, and would have been built as either a "Roadster", "Interstate" or less likely as a "Hi-Rider" model (no Mk V Fastback).

Commando model identification: http://www.nortonmotors.de/ANIL/Commando.htm

"220030" is quite an early Mk V serial number (220000-on), apparently some 22xxxx numbered bikes were sent to the USA which have earlier date stamps, but higher serial numbers than yours?
Those early 22xxxx machines are officially unknown as far as the production records are concerned, the official start date for Mk V production being March 1973 from serial number 220000.

#75756 - 07/10/08 8:40 pm Re: Norton Identification please  
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TBolt72 Offline
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TBolt72  Offline
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Glenwood, Iowa USA
Thanks! Thats all great info. How do I tell if its a combat engine? The fins are about 1/2 as close between the cylinders and the head, compared to the fin spacing on the barrels. I dont see a C stamped on the head but I dont know where to look.

#75757 - 07/10/08 9:25 pm Re: Norton Identification please  
Joined: Mar 2006
Posts: 3,469
L.A.B. Online content
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L.A.B.  Online Content
BritBike Forum member

Joined: Mar 2006
Posts: 3,469
Norfolk, UK
Quote:
Originally posted by TBolt72:
How do I tell if its a combat engine?
As it's a Mk V model, then it is unlikely to have a Combat spec. engine.


Quote:
Originally posted by TBolt72:
The fins are about 1/2 as close between the cylinders and the head, compared to the fin spacing on the barrels. I dont see a C stamped on the head but I dont know where to look.
The narrower head/barrel joint fin spacing would be normal.
A Combat head normally has the "C" stamped on the top of the head at the point where the two exhaust rocker housings come together, and the head steady will probably have to be removed to see it, -if it is there, but there probably isn't going to be any C stamp on your Mk V cylinder head?

#75758 - 07/11/08 11:35 am Re: Norton Identification please  
Joined: Oct 2007
Posts: 234
Ron Leisner Offline
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Ron Leisner  Offline
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Ohio
There were two versions of the MkV 750, Hi compression and lo compression. Most sold in the US seem to be the hi comprssion variety.
The hi compression (9.3:1) cylnder head will be stamped RH6 while the lo compression is stamped (8.9:1) is stamped RH5.
The MkV had 32mm intake ports, the 5 plate clutch, and the standard (non-combat) cam. I have two of those "mysterious" pre-March '73 models. Both built in Nov. '72 and both with serial numbers higher than yours. Go figure!


Ron L
1973 MkV 750 Roadster
1974 850 Interstate
1975 850 Cafe Racer
1968 750 Fastback
1967 P11
1969 Ranger 750
#75759 - 07/12/08 2:23 am Re: Norton Identification please  
Joined: Dec 2006
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TBolt72 Offline
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TBolt72  Offline
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Glenwood, Iowa USA
Well theres an oddity to the date stamp. On the VIN plate, the date is stamped upside down compared to the rest of the lettering on the plate. It doesnt look double stamped or modified.

#75760 - 07/16/08 1:13 am Re: Norton Identification please  
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TBolt72 Offline
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TBolt72  Offline
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Glenwood, Iowa USA
I checked out the head and I can see H 6, so Im supposing its and RH6 head. Its got a front disc brake but I cant tell what size the carbs are, no numbers on them. From what Im reading about Combat engines, Im glad I dont have one. Im really looking forward to reassembling this bike and riding it. Its only got 5000 miles on it, so hopefully it wont need too much machine work. How do I get a look at the cam to see what numbers are on it?

#75761 - 07/16/08 11:17 am Re: Norton Identification please  
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Posts: 234
Ron Leisner Offline
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Ron Leisner  Offline
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Joined: Oct 2007
Posts: 234
Ohio
Quote:
but I cant tell what size the carbs are, no numbers on them
The carbs should be marked "932" (32mm). If you have an RH6 head it is very likely you have the 932 carbs.


Ron L
1973 MkV 750 Roadster
1974 850 Interstate
1975 850 Cafe Racer
1968 750 Fastback
1967 P11
1969 Ranger 750
#75762 - 07/19/08 2:04 am Re: Norton Identification please  
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TBolt72 Offline
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Glenwood, Iowa USA
I dont see any numbers except 389/203 on both carbs. Shouldnt there be a right and left carb? They are both the same.

#75763 - 07/19/08 5:18 pm Re: Norton Identification please  
Joined: Mar 2006
Posts: 3,469
L.A.B. Online content
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L.A.B.  Online Content
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Posts: 3,469
Norfolk, UK
Quote:
Originally posted by TBolt72:
I dont see any numbers except 389/203 on both carbs. Shouldnt there be a right and left carb? They are both the same.
Sounds as if somebody has fitted a pair of earlier AMAL Monobloc carbs if they are 389/203: http://www.amalcarb.co.uk/galleryDetail.aspx?imageID=423&imageText=AMAL%20Monobloc%20Carburetter

The originals would have been left & right hand AMAL Concentric Mk1 carbs: http://www.amalcarb.co.uk/galleryDetail.aspx?imageID=418&imageText=AMAL%20MK1%20Carburetter

#75764 - 07/19/08 10:51 pm Re: Norton Identification please  
Joined: Dec 2006
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TBolt72 Offline
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TBolt72  Offline
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Glenwood, Iowa USA
Thats them alright. What works better? The 32mm originals, the monoblocs or Mikunis?


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