This thread has gone on for a long time which gave me time to think of all the mods and changes my bike has had over 45 years of ownership. Some were very necessary. Some pure vanity.
Starting from front to back.
New stainless front and rear rims and spokes. Still 19 in. Sometime in the 1990s to replace very rusty originals.
A new stainless front guard to replace the one damaged by a Jaguar car backing into the original. Not really an upgrade. Around 2018.
Landsdown fork internals. 2018.
Hydralic steering damper. 1978.
CNW front disc. 2018.
Pazon ignition. 2018. Over the years it has also had the original points 1978, Rita 1979 and Boyer 1996.
Triumph left and right side handlebar switch units. 1996. I prefer all switches on the left hand plus I don't care for the Norton toggles that broke a few times.
Mirrors from a random Jap bike which work and look way better than originals in my opinion. 2019
Stripped exhausts repaired with BMW fittings. 1978.
Dave Taylor head steady. 2019
CNW isolastics 2019.
Crack tested, dynamically balanced and radius ground crankshaft. 2019
JS motorsport longer rods and pistons. 2019
CNW motor hardware kit including head kit. 2019
CMW rocker oil feed lines.2019
Tachometer drive seal upgrade. 1996.
Converted back to standard camshaft from 4 S around 1996. More of a reversal of the first owner "upgrade"
JS motorsport breather valve. 2019.
CNW hydraulic clutch 2019
CNW electric start 2019
Home made mini ham can airbox 2019
RGM fold away kick start. 2019. This is a really really good mod.
New wiring harness 1996.
Upgraded altenator and MOSFET unit. 2019
Premier carbs 2019
New Andover gearbox casing to replace cracked original. New bearings throughout including layshaft of course. 2019
Rear brake safely spring ??
One piece rear axle. ??
Icon rear shocks 2022.
Roadster tank and sidecover repaint 1996.
Interstate tank and sidecover set purchased for longer rides. 2019.
Various stainless bolts nuts etc added over the 40 something years.
Plus all the various maintenance items like valves, and various gearbox and clutch items which wore out over the years but they don't count as upgrades.
A final one which I regard as a very positive upgrade was a meticulous check as per the " World's straightest Norton article " the frame was checked on a jig, swinging arm straightened , isolastics, wheels ,rims forks alignment all checked. Made the bike feel much nicer.