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by john.whiting
Thu Sep 26, 2013 10:51 am
Forum: Ariel Talk
Topic: BA gearbox sprocket removal mod?
Replies: 10
Views: 2313

The standard Burman BA mainshaft will pass the drive sprocket over the clutch spline.Out of only four postwar bike makers to use this box, one wont allow easy sprocket replacement,Ariel.So you could swap your bike for a Panther or a Vincent.And live happily everafter.Regards John.
by john.whiting
Tue Sep 17, 2013 10:05 am
Forum: Four stroke
Topic: Bent GB gearbox mainshaft
Replies: 5
Views: 1227

Straightening a case hardened shaft should be done at the tempering temperature,which will be around 250c.This will almost eliminate any likelihood of cracking of the hard surface,and any reduction in hardness will be slight.The heated shaft is best straightened with a lead hammer on lead blocks,thi...
by john.whiting
Sat Sep 07, 2013 10:28 am
Forum: Main Chat Forum
Topic: 1950 SQ4 - Big End Shells (Bearings)
Replies: 10
Views: 1522

Regrettably,very few bearings can be bored now,they have what is known as microlayer surface.This means the whitemetal is only 005 to 007 thick.Your machinist will know all about this,I would imagine.These days, resizable bearings will be generally be a leadbronze, golden brown in color and not a wh...
by john.whiting
Thu Sep 05, 2013 11:19 am
Forum: Electrics
Topic: 300 watt dynamo/alternator on my Square 4!!
Replies: 10
Views: 3961

Shutting the stable door after the iron horse has bolted?Regards John.
by john.whiting
Wed Aug 28, 2013 10:56 am
Forum: Four stroke
Topic: Confused of Norwich writes on the subject of coupling gears
Replies: 19
Views: 2713

Im convinced that most of the problem is that todays engine oils are thin as water,no matter what the numbers on the label say.Even so called castor oils have no body like they used to have.Regards John.
by john.whiting
Wed Aug 28, 2013 10:51 am
Forum: Ariel Talk
Topic: Innertires on demand
Replies: 6
Views: 954

Why not a motorbike jacket made from old tubes,instead of sliding down the road,you d bounce to a stop.Could be a new fashion craze.Regards John.
by john.whiting
Tue Aug 27, 2013 10:06 am
Forum: Ariel Talk
Topic: Innertires on demand
Replies: 6
Views: 954

In my day we called them tubes,and old ones were cut up to provide heavy duty rubber bands.Very useful for securing things to luggage racks,handle bars,and rear mudgards.A mate had a crap car(Standard 10) and one of these bands was attached to the gearstick to keep it in top gear.Also very handy for...
by john.whiting
Thu Aug 22, 2013 10:10 am
Forum: Four stroke
Topic: NG cam upgrade
Replies: 15
Views: 2437

Sprues and risers would have to be cut off of course.Regards John.
by john.whiting
Thu Aug 22, 2013 10:07 am
Forum: Four stroke
Topic: NG cam upgrade
Replies: 15
Views: 2437

Investment castings are normally used without any finishing,and can be heat treated just like any other metal item.The turbine blades in jet engines are cast in this way,from various alloys which are nearly impossible to forge or machine.Ariel followers could be cast, the bore for the pivot reamed,h...
by john.whiting
Wed Aug 21, 2013 10:39 am
Forum: Four stroke
Topic: NG cam upgrade
Replies: 15
Views: 2437

Investment casting is the secret.All that's needed is a wax pattern.The casting uses types of alloy steel that flow easily.Various types of stainless are favorites,and also 4140.All the JAP parts you see in these replicas are investment cast.On a production basis ,a method of producing the wax in qu...

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