1974 Fork Rebuild For MX

Here you can talk about all kind of TECH for the B50 B44 B25 And Other BSA unit Singles

Moderator: minetymenace

Post Reply
johnu
>180
>180
Posts: 183
Joined: Wed Mar 13, 2019 11:18 pm
Location: Redlands California
Has thanked: 41 times
Been thanked: 11 times
Flag: United States of America

1974 Fork Rebuild For MX

Post by johnu » Fri Aug 14, 2020 4:04 am

Getting ready to strip and rebuild my forks on the 74 tr5mx. I am going to be riding this bike in vintage mx so I want the fork to be the best it can be. Any suggestions or tips as to the best things to do to these antiquated forks?
KTM 350sxf
KTM 500exc
BSA A10 Road Rocket (RGS Rep)
TR5mx
S*zuki GT500

mlb50
>220
>220
Posts: 224
Joined: Wed Jun 25, 2014 4:25 am
Location: Perth, West Australia
Has thanked: 0
Been thanked: 12 times
Flag: Australia

Re: 1974 Fork Rebuild For MX

Post by mlb50 » Fri Aug 14, 2020 5:32 am

Without spending a ton of money re-engineering them, you can fit progressive springs and synthetic fork oil. Weight of oil depends on bike loaded mass and how much damping you want.
These users thanked the author mlb50 for the post:
johnu (Sat Aug 15, 2020 11:24 pm)
Rating: 25%
B50 @ 10:1 - what's a leg between friends?

johnu
>180
>180
Posts: 183
Joined: Wed Mar 13, 2019 11:18 pm
Location: Redlands California
Has thanked: 41 times
Been thanked: 11 times
Flag: United States of America

Re: 1974 Fork Rebuild For MX

Post by johnu » Sat Aug 15, 2020 11:29 pm

I will look into those springs. I live very close to Racetech so I might head over there to see what they suggest also. They like to charge $$$$ though!
One thing that is bugging me is that there is no lug to bolt the brake plate locating arm to. Someone suggested that maybe original owner cut it off but there is absolutely know evidence of that. Bike came with the 18" wheels on it which locates on a different lug.
KTM 350sxf
KTM 500exc
BSA A10 Road Rocket (RGS Rep)
TR5mx
S*zuki GT500

mlb50
>220
>220
Posts: 224
Joined: Wed Jun 25, 2014 4:25 am
Location: Perth, West Australia
Has thanked: 0
Been thanked: 12 times
Flag: Australia

Re: 1974 Fork Rebuild For MX

Post by mlb50 » Sun Aug 16, 2020 2:52 am

Does the fork still have the 2 studs on the upper end (mudguard mount)? If so you may be able to fabricate a tension arm to the front of the brake plate which would need a welded lug with a through stud, unless the one already there could work?
These users thanked the author mlb50 for the post:
johnu (Sun Aug 16, 2020 8:38 pm)
Rating: 25%
B50 @ 10:1 - what's a leg between friends?

Post Reply