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TOPIC: B25 project

B25 project 6 years 5 months ago #1101

  • rcolahan
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Steve..we met 2 years ago at the August Rel Run...I was on the orange 69 BSA B25.
I just started a 1971 B25 oif project similar to yours.
I'd also like to swap out the front forks for a set from the local salvage yard...from a 70's or early 80's Jap MX or DS bike.
Did those XL 250 forks trees match up to the BSA bearing races?
Or did you have to swap the bearings?

I appreciate any advice.

-Richard Colahan
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B25 project 6 years 5 months ago #1102

  • smith
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man the XL250 forks required a lot of engineering fueled by beer but here's the skinny on that modification,OIF 250s used tapered roller bearings in the steering head which have an I.D. of .750",the XL forks steering stem is hollow and pretty close to that 3/4",I cut the stem off flush with the lower tree and use a 3/4" grade 5 bolt of the correct length as my stem,grade 8s are not available in the correct length,grade 5 is plenty strong enough,I used some light sheet (beer can)to get a tight fit at the bottom,the top tree will require a sleeve as well,I used a piece of 7/8 handle bar which worked great,you will need some washer to "shim" out the height but we aint makin a space shuttle here so don't sweat it,I got this idea from a set of betor forks which also used what looks to be a bolt as a stem
I've been running this setup for 3 years and the only thing I have done was reset the nut as the forks set in,all of the hardware I got from boltdepot.com they are way cheaper than fastenal and have a great selection of nice stuff like thin jam and nylok nuts that you will need on this project,I did this to another bike I was messing with and used the same trees with a set of 35mm leading axle forks and it worked great as well
if this was easy,everyone would do it
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