Author Topic: 1958 C12 clutch  (Read 231 times)

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Offline greasyphil

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1958 C12 clutch
« on: January 10, 2016, 06:52:42 PM »
Hello can some one tell me what length are the spacers that fit over the 3 bolts, that the 3 clutch spring nuts tighten up to, mine are missing, i want to make 3 on my lathe

Online ianinglis

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Re: 1958 C12 clutch
« Reply #1 on: January 10, 2016, 07:15:13 PM »
they are 1" or about 25mm
there have been several postings on this subject
10mm o/d steel tube has been used in the past just make sure the tube fits over the 3 studs and inside the springs with a bit of clearance



ian
BSA C10L 1956 - JFO 588
BSA C10L 1954 - MVE 107
RM6 RALEIGH RUNABOUT
ENFIELD DIESEL KUBOTA OC 95
BSA M21 RIGID RKN 816
CBF 1000
BSA ARIEL 3

Online ianinglis

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Re: 1958 C12 clutch
« Reply #2 on: January 10, 2016, 07:16:59 PM »
if you decide to fit an extra plate then some folk make the spacers a little longer but i didnt bother and the extra spring pressure made no difference to the feel of the clutch


ian
BSA C10L 1956 - JFO 588
BSA C10L 1954 - MVE 107
RM6 RALEIGH RUNABOUT
ENFIELD DIESEL KUBOTA OC 95
BSA M21 RIGID RKN 816
CBF 1000
BSA ARIEL 3

Online camman3

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Re: 1958 C12 clutch
« Reply #3 on: January 10, 2016, 08:26:00 PM »
I found the original ones to be 15/16 inch long, and mine ended up about 1 and 1/16 inch long after fitting additional friction and plain plate. It will also depend whether you have cork or composite plates that are generally thinner.....but either way, it is better to start longer....as you can always take it off, but cant put it back on.
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline Slow Rider

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Re: 1958 C12 clutch
« Reply #4 on: January 11, 2016, 08:13:33 PM »
In a moment of impatience and having no access to a lathe or anything better to work with I made spacers  from a length of brass pipe that was lurking in the shed. Engineers look away now; I used a plastic ruler to measure the length , a hacksaw to cut the spacers and a file to square them up a bit.
      That was a while ago and I intended to get around to sorting out some proper steel replacements once I knew I had made the tubes to the  dimensions that allowed proper clutch adjustment and cure the bike's propensity for impromptu wheelies.
     I did my best to cut them to an inch long and by the time they had been squared-up  with a file they ended up -engineers look away- a fraction less than an inch.
     Not very technical but I've still not got round to sorting more permanent replacements or felt the need.
         
West Sussex .55 C11g and chopped Gold Star with 6" over forks and hard-tail . Only kidding .(about the C11)