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Jubilee Fork Bush Tolerance

Submitted by bruce_firth-clark on Fri, 10/07/2020
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Light Twins

Well - I thought (hoped) that my 65 Jubilee was complete but I’m now in a quandary.  Final checking of all areas I noted a small amount of “rock” in the fork legs - stripping & measuring (again) I’ve got 0.20mm clearance between top bush & bottom bush (same both sides) and the fork leg tubes.  As the bottom bushes are new and the top ones measure the same do I have a problem with the fork tubes”?

Does anyone know what the tolerance should be and what the MOT allowance would be for this age of bike?
 

Cheers All - Bruce

Submitted by dennis_thompson on Sat, 11/07/2020

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I believe that this age of motorcycle does not require an MOT if you have it registered as an historic vehicle. See the Government web site. The vehicle must be more than 40 years old to qualify.

There is a small amount of play in the forks of my '64 Jubilee but given the method of construction I would be surprised if there was not some play. It is not noticeable when I ride the bike.

Dennis

Thanks Dennis - I’m aware of the MOT status but have to get the bike registered so would prefer to have it checked over considering how much work had to be done with it!

Good to know about the “play” in the forks - I wasn’t sure what would be considered reasonable for  that style of fork stanchions, I’m used to Japanese forks which should have no (or minimal) play in the bushes
Cheers - Bruce

Submitted by dan_field on Sun, 12/07/2020

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Denis, he’s already done the bottom bushes!  I’d say just use thicker oil, you could do with the camping anyway! 

I have a set of bushes and intend to change mine. I recall some have successfully used an epoxy resin to hold the bushes - like JB weld.

dan

Submitted by bruce_firth-clark on Mon, 13/07/2020

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Thanks Dennis & Dan - I’d forgotten about that “blog” and all the measurements etc, did read it a few years ago and found other parts of it useful!

I’ve initially decided to stick with what I have and see how it goes - with new lower bushes and the top ones within a few “thou” of the lower and with the amount of play I suspect it’s the tubes that are worn.  I’m keeping a look out for a spare set of “square” bottom sliders and if necessary get them re-tubed.

By the way - it started no problem (once I’d fitted the fuse!) and runs well - exhaust is a bit noisy but I’m going to try extra baffling, I see what people are saying about engine noise as well - definitely not a top end “rustle” but more a combined “rattle” - needs to be run in but currently waiting for the NOC records to do their thing (no registration docs when bought) before going the DVLA route.

Cheers - Bruce

Submitted by dennis_thompson on Mon, 13/07/2020

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Bruce,

Good to hear that you are up and running.

I registered my bike with help from  the NOC Records Officer as it too had no paperwork. The DVLA sent a contractor round to check that the engine number and frame number were correct, as stated by me, and that the bike had not been modified. Not too painful as he just took a few photos. It helps if the frame number is visible.

I have non-standard megaphones on my bike from Classic Bike Shop. They were far too loud so I bought a couple of their silencer mats (looks like fibreglass) and wrapped that round the internals using the metal bands supplied. At least it does not shatter  windows now.

Dennis

Submitted by dennis_thompson on Mon, 13/07/2020

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Just read Dan's comments - he needs to get that spell checker sorted. 'Camping' indeed - made me laugh.

I used to work with a lady whose name was Jacky Collins (not THAT one). The spell checker in those days came back with 'Jerky Colons' for her name.

Dennis

 



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