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by john.whiting
Mon Apr 06, 2020 1:40 pm
Forum: Main Chat Forum
Topic: Odd spares
Replies: 2
Views: 106

Re: Odd spares

The gears are Velocette ,from a MOV or MAC,quite early ,maybe prewar...........The cable looks to be a push/pull control cable .
by john.whiting
Mon Apr 06, 2020 1:32 pm
Forum: Main Chat Forum
Topic: Burman BA Mainshaft Endfloat
Replies: 5
Views: 273

Re: Burman BA Mainshaft Endfloat

I have a NOS BAP Burman (1947),done only a few miles on my Panther ,and it has no more than .020 " mainshaft endfloat ......Certainly never been apart ,still has factory gaskets,etc.
by john.whiting
Fri Apr 03, 2020 2:22 pm
Forum: Main Chat Forum
Topic: Article on Earles forks
Replies: 4
Views: 163

Re: Article on Earles forks

Its not generally known that Earles forks fitted to Panther two strokes had a number of structural failures ,leading to lawsuits for injury and death of riders,and P&M ditched the Earles forks and used their own heavyweight teles ,which were too big for the lightweights ,and looked clumsy.
by john.whiting
Wed Mar 25, 2020 5:16 am
Forum: Four stroke
Topic: Rods and generator
Replies: 9
Views: 367

Re: Rods and generator

I believe the dimensional variation being complained about originally is in fact of the order of .003" undersize,not a few tenths.And as Mr Reynolds says,a newish quality CNC machining centre can hold a tolerance of 2 tenths day in day out,one with a few millions parts on the clock may not........
by john.whiting
Sun Mar 22, 2020 10:12 am
Forum: Four stroke
Topic: Mainshaft repair
Replies: 12
Views: 250

Re: Mainshaft repair

A hardfacing rod that air hardens ,but the ones hard enough for roller races have a tendency to check as they cool...............a bit of experimentation would be good idea......generally ,for roller races a 55Rc hardness is OK ........I am assuming here you dont have facilities for case hardening a...
by john.whiting
Sun Mar 22, 2020 5:35 am
Forum: Four stroke
Topic: Mainshaft repair
Replies: 12
Views: 250

Re: Mainshaft repair

Unlike a Matchless or Panther clutch ,where the nut compresses all the parts against the flange ,Ariel thrust washers are just loose ,so there is no load on the little flange.....a small section wire circlip would likely be OK there.
by john.whiting
Sun Mar 22, 2020 5:31 am
Forum: Four stroke
Topic: Mainshaft repair
Replies: 12
Views: 250

Re: Mainshaft repair

I thought of a much simpler ,cheaper way.....press on a replacement hardend sleeve from the inner /gearbox end .......turn the boss down up to the splines ,(leave them),and make up a sleeve with a flange and press it on....All the thrust is to the 'outside ' when the clutch is thrown out,there is vi...
by john.whiting
Sun Mar 22, 2020 4:20 am
Forum: Four stroke
Topic: Mainshaft repair
Replies: 12
Views: 250

Re: Mainshaft repair

I would probably grind the roller race only ,not reducing the outer slotted part ,and fit a sintered bushing ,preferably one with moly in the structure,or maybe some modern plastic. Depending on how hard the surface was after reduction,I might look at fitting crowded needle rollers.....The choice wo...
by john.whiting
Sun Mar 22, 2020 2:39 am
Forum: Four stroke
Topic: Mainshaft repair
Replies: 12
Views: 250

Re: Mainshaft repair

Having reread #1,are you wanting to build up only the contact surface of the cage,IE the edges of the race?,not the roller track.?
by john.whiting
Sun Mar 22, 2020 2:34 am
Forum: Four stroke
Topic: Mainshaft repair
Replies: 12
Views: 250

Re: Mainshaft repair

Its true,even in gearboxes,hardchrome with rollers will result in a disappearance of the chrome .....Ive never tried it in a bike ,because mostly bushes ....which are excellent with hardchrome.......However in truck boxes with large dia. shafts and wide rollers ,seemingly ideal conditions ,the chrom...

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