I feel I need to replace the fork bushes on my 1961 B40. I do get a knock through the front forks over rough roads. The steering ball races have been replaced and there is no slack there. I couldn't feel any sloppiness with the fork bushes when I rebuilt the bike but sometimes noises only manifest under load.
Question -
can I replace the bushes with only the tool to remove the oil seal holder? Are any other tools required to sort out the damper assembly?
I've got to make the tool to remove the oil seal holder - has anyone got any dimensions or can someone lend me the tool?
Any advice appreciated.
BSA forks, pre the 1966 damper rod version, do tend to knock on full extension. Even the 1969/70 shuttle valve forks have been known to top in this way It is the top and bottom bush clashing together. There is no damper assembly in them.
It is worth check that you have the correct strength fork springs, too strong and the liklihood of clash is increased. Sometimes using thicker oil helps.
Hi Andy,
A rubber strap wrench may remove them if not too gummed up, particularly if you warm them with a hairdryer first.
On my B40 that didn't work so I bought the tool. That didn't work either and the only option was to leave them or cut them off.
I'm in Norfolk if you want to borrow it.
Cheers,
Bernie
Thanks for the replies.
I lifted the bike this morning and on full extension, there is a bit of play between the upper and lower fork legs. Difficult to feel or notice when the forks are compressed.
Julian - I may try thicker oil first - any suggestions?
Bernie - thanks for the offer but I'm a good 3 hours away from you. It would be helpful if you could measure the internal and external sizes of the tube the seal removal tool is made from. I can them make my own.
Thanks, Adrian
I would try 30 first and if needed try 40. Dont expect too much from these forks, they are simple and functional, they were designed over 70 years ago and dont have much damping on extension.
Adrian, I'll measure them up tomorrow and post the details.
Cheers,
Bernie