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by john.whiting
Tue Jan 29, 2013 10:15 am
Forum: Four stroke
Topic: Frozen bolt in girder fork top yolk
Replies: 9
Views: 1599

The most effective penetrant for rusted in parts is dilute nitric acid[ 30%].This solution has a very low surface tension,and it dissolves rust very quickly.Make a little dam of plasticene around the joint,and drip some in .It will go clean thru in a few minutes.I have used it to loosen very large a...
by john.whiting
Sat Jan 26, 2013 10:21 am
Forum: Four stroke
Topic: Flywheel alignment
Replies: 29
Views: 3994

The commonest cause of misalignment in modern press in pin assys is shaving of the bore in the flywheel.That may sound a bit cryptic,but if your new pin has sharp ground ends,it will broach out the hole instead of maintaining an interference fit.Remedy is to break the edge with a fine stone before i...
by john.whiting
Sat Jan 26, 2013 9:30 am
Forum: Main Chat Forum
Topic: My new Crank
Replies: 58
Views: 7903

The break shown has none of the typical features of a properly case hardened pin.The material appears to be uniform all thru.Is the pin hard at the centre around the oil hole.Ive been told that Alpha tried thru hardened pins some 20 years ago,and had a lot of failures in Vincents.The new management ...
by john.whiting
Sun Jan 20, 2013 11:45 am
Forum: Four stroke
Topic: flange
Replies: 15
Views: 3112

If you fit a couple of felt end washers to stop air bypassing the mesh,it would work quite well.The bottom part is definitely meant to fit an upright filter,the four slots allow oil to return to the sump in the base.Oiled mesh is a good dust filter,but without the oil wash,it blocks up fairly quickl...
by john.whiting
Sat Jan 19, 2013 10:15 am
Forum: Four stroke
Topic: flange
Replies: 15
Views: 3112

It may be a collection of bits that fit.Maybe the end fell off [its held by a wingnut],or maybe the bits there now looked better[are they stainless?].An oilbath filter would not work with perforated sides,as the intake air has to hit the oil with enough velocity to carry oil mist up into the mesh.As...
by john.whiting
Fri Jan 18, 2013 10:33 am
Forum: Four stroke
Topic: flange
Replies: 15
Views: 3112

The filter is a Vokes,and is a standard model used for anything requiring an air filter.It has a pleated felt ,mesh reinforced element.The method of servicing is as follows:. Wash element in petrol,dry and check for holes in the felt or damage to the thick felt sealing edges.Oil element thoroughly,o...
by john.whiting
Thu Jan 17, 2013 10:24 am
Forum: Ariel Talk
Topic: 49 SQ4 Petrol Tank
Replies: 13
Views: 2453

No offence to anyone,but I cannot see that removing a tank made by the Ariel factory slightly later than the rest of the bike ,and replacing it with one made in a hovel in a back street in Mumbai adds to the originality of the bike.A fullwidth front hub wheel was a common customizing mod made in the...
by john.whiting
Thu Jan 17, 2013 10:08 am
Forum: Ariel Talk
Topic: Amal Carb
Replies: 15
Views: 2392

Have you seen diecast disintegrate over a period after electroplating? It was a car grille,and eventually turned into crumbly grey particles.It pays to know what youre doing.Regards John.
by john.whiting
Sat Jan 12, 2013 9:54 am
Forum: Four stroke
Topic: Gudgeon pin modify
Replies: 7
Views: 1119

Making your own pin is easy enough,but its going to require four separate heat treatments[carburize,core refine,harden,temper.] which is going to be costly for a one off,unless youve got your own furnace.One of my favourite" off the peg" pins is Repco s R3039,available in std7/8" and ...
by john.whiting
Fri Jan 11, 2013 10:15 am
Forum: Four stroke
Topic: Gudgeon pin modify
Replies: 7
Views: 1119

Its very easy to turn out the inside of pins.Simply select the largest suitable boring bar,use a grade of insert suited to hardened steel,and once you cut thru the hard case the metal is soft.Of course a ceramic insert will cut any hard steel ,but they are a bit pricey for beginners,and fragile too....

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