Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Normal
I'm a little lost here. Is it required that you fit a Commando primary cover to use points on the cam end in a P11 engine? My only experience with cam mounted AAU and points system* starts with the 750 20M3S engines (Commando) that only came along in mid-1969 - some time after the last P-11 was built.What's the solution here?On a different note, 1/4" is one of the most confusing sizes in British motorcycles. It's almost impossible to tell the difference between a 1/4" Cycle threaded screw (26 Tpi), a 1/4" BSF threaded screw (26 Tpi), and a 1/4" UNF threaded screw (28 Tpi) just by looking at them. The 1/4" UNF screw is entirely incompatible with the other two -- trying to fit the two together will result in damaged threads -- but the two British standard screws seem compatible because they will appear to screw together properly but the thread cross-section pattern is different and the resulting thread interaction will give a lower level of strength and reduced service life. (Something in the back of my head tells me that Commandos suffered a similar issue with the change in cam thread during its production life, but I don't trust those voices any more.)Thanks, BY(* Ok, you know that the "points" aren't fitted to the cam but are in conjunction with it - you know what I mean.)
I'm a little lost here. Is it required that you fit a Commando primary cover to use points on the cam end in a P11 engine? My only experience with cam mounted AAU and points system* starts with the 750 20M3S engines (Commando) that only came along in mid-1969 - some time after the last P-11 was built.
What's the solution here?
On a different note, 1/4" is one of the most confusing sizes in British motorcycles. It's almost impossible to tell the difference between a 1/4" Cycle threaded screw (26 Tpi), a 1/4" BSF threaded screw (26 Tpi), and a 1/4" UNF threaded screw (28 Tpi) just by looking at them. The 1/4" UNF screw is entirely incompatible with the other two -- trying to fit the two together will result in damaged threads -- but the two British standard screws seem compatible because they will appear to screw together properly but the thread cross-section pattern is different and the resulting thread interaction will give a lower level of strength and reduced service life. (Something in the back of my head tells me that Commandos suffered a similar issue with the change in cam thread during its production life, but I don't trust those voices any more.)
Thanks, BY
(* Ok, you know that the "points" aren't fitted to the cam but are in conjunction with it - you know what I mean.)
