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11
Technical Section / Re: C11 fork clunk
« Last Post by Tman on Yesterday at 05:42:12 pm »
My A7 (with the same design of forks) clonks out over one particular pair of ridges on a lane near me. I think the consecutive bumps confuse them.
Never get this problem with a good set of girders though.
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Technical Section / Re: C11 fork clunk
« Last Post by ROB KEMP on Yesterday at 05:37:47 pm »
Reminded me of a video i watched on you tube of Kevin Schwantz leading in a gp pulling wheelies on every straight not just popping a wheel but full blown upright ones after the race he was interviewed and said because he had such a lead he thought he would entertain the crowds i suspect that was on a ring a ding motorcycle
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Technical Section / Re: C11 fork clunk
« Last Post by Owen on Yesterday at 04:53:50 pm »
I've had the C10 detuned to stop the wheelies  ;D
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Technical Section / Re: C11 fork clunk
« Last Post by Vreagh on Yesterday at 03:00:18 pm »
Surely they must clonk when you  pull wheelies though ? 😁
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Technical Section / Re: C11 fork clunk
« Last Post by Owen on Yesterday at 12:18:35 pm »
I only noticed it when I get the front wheel of m C10 off the ground whilst going over a hump back bridge :o
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Technical Section / Re: C11 fork clunk
« Last Post by timsdad on Yesterday at 07:03:45 am »
I've always used multi-grade engine oil in my Brit bike forks - stuff like Duckhams 20-50, GTX and Total Gold from the 60s, through to 15-40 car semi-synthetic oil for the last several years. It has the lightness of a straight fork oil when it's cold, holds this sort of viscosity as it warms up and these old bikes don't work it hard enough for the oil to froth, which would be the problem when using it in modern suspension.

I have never noticed any rebound clunking over the years but it may be that I'm used to the noises these old bikes make. I wasn't always a fat bloke.


Ray
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Technical Section / Re: C11 fork clunk
« Last Post by lister man on November 22, 2020, 11:45:33 pm »
Thanks john hope your knee op goes ok, I'm guessing mine are the early tele forks
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Technical Section / Re: Bsa c11 clutch
« Last Post by BSAc11g on November 22, 2020, 10:40:46 pm »
We have somewhat different definition of "oil tight" now days than that did when the C series was new.
A few drops of oil on the ground after a long run or a set of cases that were damp was considered tight back then .
Remember that BSA vented both the crankcase and the primary onto the rear chain so if it iw working properly then the chain should always leave drips of oil when sitting still .

Now there is a difference between being "oil tight" and "not leaking " , which is how I would describe the best I ever get any of my motorcycles.
There is an oil rag in all of the tool boxes and if I have to park over a white concrete or tiled surface the primary gets a quick wipe which usually will catch the first hour or so of drips .
Otherwise it is park on bitumen or grass or dirt where a few drops of oil are no problem now just the same as they were no problem when the bike was new
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Technical Section / Re: C11 fork clunk
« Last Post by chaterlea25 on November 22, 2020, 10:33:40 pm »
Hi LM
The early tele forks do not have the two little holed drilled in the stanchions that suck in some oil between the bushes and trap it there
as the forks extend, this stops the metal to metal clang as the forks top out
Its an easy modification to do, I am off to hospital tomorrow for a new knee joint so will not be able to measure up the stanchion holes for you, hopefully one of the others here will have a stanchion to hand ??
That and shim the top bushes to the circlip if there is movement between them
Yes the Dow type dampers will fit, then you need thinner oil or they will be too stiff

John
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Technical Section / Re: C11 fork clunk
« Last Post by camman3 on November 22, 2020, 08:09:24 pm »
  ;D ;D
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