- Joined
- Sep 26, 2009
- Messages
- 2,210
Would'nt be great if one shoe size fits all feet?
Well in 1953 Norton did just that,not with shoe's..but fork springs.
350 light weight single- 850 twin, yes same old spring!
This may interest some...not all.
I have just last week made up some Lansdowne dampers for a Racing Seeley with a all alloy Goldstar engine,very light machine.
The forks Seeley design but with a caliper mount are just the same as Nortons .
Any way the guy phoned me after fitting them, complaining the action felt stiff and harsh,
so after a few trial pumps i agreed they where harsh with some sticking when fully compressed.
I stripped them checked all the clearance's etc and re-assembled them...no better!
At full compression the fork was reluctant to return and sounded rough, just for the hell of it i removed the internal stock norton spring and fitted a External spring....total transformation..now compliant and smooth!
It appears at full compression the stock internal spring binds,well the amount of side wear confirms this :!:
With a bit of assistance from the rebound damper this locking up is excessive.
Modern bikes have internal shorter springs and less travel, measured a R1 its 75mm,so the buckeling is far less.
So i did a little test , I installed a spring into a stanchion ,then using a treaded rod and two nuts fully compressed the spring inside , at full compression the spring snakes up and binds quite tight, if the stanchion as a rough internal surface it take's a hard push to move it :!:
So just another bit of trivia to think about, Me..well i am changing the MK 3 to External springs and gaiters....all that internal spring grinding is not for me, must produce some lovely metal slurry :!:
No wonder the slider's wear!..still out of sight out of mind.
Well in 1953 Norton did just that,not with shoe's..but fork springs.
350 light weight single- 850 twin, yes same old spring!
This may interest some...not all.
I have just last week made up some Lansdowne dampers for a Racing Seeley with a all alloy Goldstar engine,very light machine.
The forks Seeley design but with a caliper mount are just the same as Nortons .
Any way the guy phoned me after fitting them, complaining the action felt stiff and harsh,
so after a few trial pumps i agreed they where harsh with some sticking when fully compressed.
I stripped them checked all the clearance's etc and re-assembled them...no better!
At full compression the fork was reluctant to return and sounded rough, just for the hell of it i removed the internal stock norton spring and fitted a External spring....total transformation..now compliant and smooth!
It appears at full compression the stock internal spring binds,well the amount of side wear confirms this :!:
With a bit of assistance from the rebound damper this locking up is excessive.
Modern bikes have internal shorter springs and less travel, measured a R1 its 75mm,so the buckeling is far less.
So i did a little test , I installed a spring into a stanchion ,then using a treaded rod and two nuts fully compressed the spring inside , at full compression the spring snakes up and binds quite tight, if the stanchion as a rough internal surface it take's a hard push to move it :!:
So just another bit of trivia to think about, Me..well i am changing the MK 3 to External springs and gaiters....all that internal spring grinding is not for me, must produce some lovely metal slurry :!:
No wonder the slider's wear!..still out of sight out of mind.