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Stuck lower fork bushing

Classic Norton Commando Motorcycles.

Stuck lower fork bushing

Postby HMNYC » Thu Apr 20, 2017 5:40 am

I had my forks apart yesterday to install the Old Britts fork rebuild kit. One side went pretty easy, the other has a completely seized lower fork bushing. I have tried heat, penetrating oil, mallet, calling it names, nothing will budge it.

So, two questions. 1, any advice on how I can get it off and 2, if I save this fight for another day what impact will a non spinning lower fork bushing have on fork performance?

Thanks,

Mike
2016 Aprilia Tuono 1100 Factory
2003 KTM 450 EXC
2001 Triumph Speed Triple
1973 Norton Commando 850
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Re: Stuck lower fork bushing

Postby kommando » Thu Apr 20, 2017 7:06 am

Is it seized inside the slider or just on the end of the stanchion. If its just on the end of the stanchion then it can be turned off in a lathe, it may break loose if a deep cut is taken,
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Re: Stuck lower fork bushing

Postby HMNYC » Thu Apr 20, 2017 7:41 am

It is seized to the stanchion and I do have access to a lathe so I will give that a go. Thank you.

I didn't realize the bushing was supposed to spin freely until I took apart the second fork so I reassembled thinking my only crime was not replacing a bushing that really didn't look too bad. As I will now need to disassemble and resemble my next question is will I need a new paper filter next to the fork seal? I have not put any oil in the fork yet.

Mike
2016 Aprilia Tuono 1100 Factory
2003 KTM 450 EXC
2001 Triumph Speed Triple
1973 Norton Commando 850
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Re: Stuck lower fork bushing

Postby dave M » Thu Apr 20, 2017 7:55 am

I don't think they are designed to spin although sometimes they do. Their critical function is for linear not rotational movement. You could cut a slot lengthways with a hand held hacksaw blade to get the bush off, a bit time consuming but effective.

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Re: Stuck lower fork bushing

Postby Biscuit » Thu Apr 20, 2017 7:07 pm

dave M wrote:I don't think they are designed to spin although sometimes they do. Their critical function is for linear not rotational movement. You could cut a slot lengthways with a hand held hacksaw blade to get the bush off, a bit time consuming but effective.


I don't think spinning is necessary but I do think a loose'ish fit allowing it to rock a bit is perhaps designed into it to aid in good alignment and reduced friction. A Dremel Tool with a small cut-off wheel would make short work of cutting a small groove the length of bush.

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Re: Stuck lower fork bushing

Postby dave M » Fri Apr 21, 2017 7:14 am

Sorry to disagree, Biscuit, but I believe that the last thing you need in a set of forks is for them to rock a bit. Even a small amount amplified over the length of the fork tube could lead to sloppy handling. If I had bushes that slipped on so easy that I could discern any play between them and the fork tube I would not use them.

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Re: Stuck lower fork bushing

Postby Biscuit » Fri Apr 21, 2017 8:54 am

dave M wrote:Sorry to disagree, Biscuit, but I believe that the last thing you need in a set of forks is for them to rock a bit. Even a small amount amplified over the length of the fork tube could lead to sloppy handling. If I had bushes that slipped on so easy that I could discern any play between them and the fork tube I would not use them.


Well maybe "rock a bit" was a poor choice of words. Original Norton parts always seemed a good slip fit unless I was dealing with forks that had rusted from years of water in them. Some replacement bushes were matched well with new replacement tubes, but sometimes either a fork was oversized or a bushing under and you just knew it was going to take more than a bit of tapping to get the bushing on. We started to get all our fork tubes and bushing from one source, I think A.N. and the parts always fit correctly. A slip on fit or with a slight tap and the bushing would be home and once in place it could move around. Should never have to drive them on.

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Re: Stuck lower fork bushing

Postby Cheyenne » Sun Apr 23, 2017 11:57 am

soak in ATF and acetone for 2 days

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