TOPIC: Those Brit & "Italian" commando frames

Those Brit & "Italian" commando frames 27 Jan 2022 16:30 #1

dynodave
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I'll try to expand the metric commando frame topic.
Starting in the 73MY, Norton may have exceeded the Renolds production limit or high cost became a factor. A long standing Italian company Verluchi , was hired to make commando frames.The nearest metric tubing was used, and the rear loop is a slightly different contour. Identifiable yes but generally insignificant,
It is suspected a few got used on late 73-750.
The dreaded commando rear loop overload sag prompted minor added support at the rear shock mount area. Renold and Verluchi.
Then for the 75 model year the whole commando range was upgraded Renold and Verluchi
rough draft for now
More to be added and corrected.DJC

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Dave Comeau
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Those "Italian" S2B Commando frames 03 Mar 2022 07:09 #2

dynodave
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I think I have answered my own question.
My S2B 74-850 frame 06-4140 is brit
My 73-750 frame 220738 is a metric frame. no frame batch ID# These may have been 28 degree frames TBA

back bone brit-2.250"***metric-2.360"/60mm

small tubes brit-1.005"***metric-.985"/25mm

ID tag mount holes position on neck
(from seated position)
brit-skewed left***metric-skewed right

rear loop shape
brit-mid point bent bars/smaller radius loop***metric- straight (very slight bend) bars/larger radius loop

rear shock mounts
brit-OEM extended loop supports***metric-post mfg added thick loop supports

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Dave Comeau
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Those "Italian" S2BE commando frames 05 Mar 2022 11:30 #3

dynodave
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The MK3 frames also had brit and metric frames same as above but with these additional characteristics.
VIN plate skew (sitting in driver position)
Brit skewed left and metric skewed right

The rear rear loop supports differ from earlier S2B frames, in that these had been placed on the left side of either the left or right loop tubes...this accommodated the locking mechanism on the MKIII "hinged" seat

This is the new steering lock stop. Lockable at both the left or right position.

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Dave Comeau
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Those Brit commando frames 05 Mar 2022 16:14 #4

dynodave Topic Author Offline Moderator dynodave Posts: 450 Thank you received: 263	Only the brit frames had Renold manufacture dates stamped on the upper gusset plates behind the Z plates S2A1.R1-71 S2B-74 R5/ -74 S2BE 2 75 Attachments: Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable. The following user(s) said Thank You: rightshiftrick
	Please Log in to join the conversation. Dave Comeau atlanticgreen.com/contact.htm

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