Writing/etching on preMK3 master cylinder cap

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L.A.B. said:
According to the 850 Mk2/Mk2A supplement, the Mk2/2A reservoir cap had a different part number (06-4973) compared to the earlier '72-'73 cap (06-1920) which might explain it, and then again, it might not?

(Plastic 850 Mk3 cap was 06-5740)
Click to expand...
like many times I think you nailed it:),IMHO the engraved cap was a late 74 part , correct for my JPN
 
A US Federal requirement from 01 01 '74, apparently:

https://www.law.cornell.edu/cfr/text/49/571.122a

"S5.1.2.2 Reservoir labeling. Each motorcycle shall have a brake fluid warning statement that reads as follows, in letters at least three thirty-seconds of an inch high:

Warning: Clean filler cap before removing. Use only ___ fluid from a sealed container. (Inserting the recommended type of brake fluid as specified in49 CFR 571.116, e.g., DOT 3.)

The lettering shall be:

(a) Permanently affixed, engraved, or embossed;

(b) Located so as to be visible by direct view, either on or within 4 inches of the brake-fluid reservoir filler plug or cap; and

(c) Of a color that contrasts with its background, if it is not engraved or embossed."
 
Jimbo...Why not mention it might be a JPN part in your first post? Would have saved a lot of useless posts.
 
The pic on the first post shows a JPN which I missed too, as it's a Federal requirement I doubt it would be just JPN but from when the MK2a was sent to US which the JPN's would have been the first. My nov 73 build MK2a did not have the cap.
 
Mine is MKII '74 HiRider...might have been a Canadian designation to have the engraving....but not bilingual. Guess the Quebecois don't need warnings, Eh!
 
L.A.B. said:
According to the 850 Mk2/Mk2A supplement, the Mk2/2A reservoir cap had a different part number (06-4973) compared to the earlier '72-'73 cap (06-1920) which might explain it, and then again, it might not?

(Plastic 850 Mk3 cap was 06-5740)
Click to expand...

After a ground up tear down and reassembly, and according to serial number, mine is a MK2 with a couple of MK2A additions. Was the transition from 2 to 2A a defined one time change or did Norton make a "slower" transition building into the transition to the 2A?
 
Lineslinger said:
After a ground up tear down and reassembly, and according to serial number, mine is a MK2 with a couple of MK2A additions. Was the transition from 2 to 2A a defined one time change or did Norton make a "slower" transition building into the transition to the 2A?
Click to expand...


There was no "transition" between 850 Mk2 and Mk2A.

The 850 Mk2 was the US market model.
The 'low noise emission' Mk2A was the European market model not a later model so Mk2s and Mk2As were produced concurrently but built for different markets although some Mk2As were eventually sold in the US, and the few JPNs were all Mk2As.
 
After doing a lot of old memory re-thinkings I recall my Norton group of our teenagers types on Ottawa , Canada .. and one soul had this engraving cap. No one thought it was cool at the time so we tossed it and replaced it with the polished cap. Cheap from Felx Gaim as he had tons of Brit Junk to freely pick into.
 
L.A.B. said:
There was no "transition" between 850 Mk2 and Mk2A.

The 850 Mk2 was the US market model.
The 'low noise emission' Mk2A was the European market model not a later model so Mk2s and Mk2As were produced concurrently but built for different markets although some Mk2As were eventually sold in the US, and the few JPNs were all Mk2As.
Click to expand...

Good info LAB, thank you.
Do you have any idea how many or how few 2A’s made their way into the US, seems an accurate record would be tough to come up with.
 
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