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by john.whiting
Thu Jan 17, 2013 10:08 am
Forum: Ariel Talk
Topic: Amal Carb
Replies: 15
Views: 2812

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: 1346

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: 1346

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....
by john.whiting
Fri Jan 04, 2013 1:06 pm
Forum: Four stroke
Topic: Flywheel alignment
Replies: 29
Views: 4643

I have allways held the opposite nut with another socket and bar,let the bar rest on the bench,while holding the flywheels down with one hand and tightening with your torque wrench.This is the method I use on HDs at about 3x the figure mentioned.I think ,if you wanted to,you could make a flywheel ho...
by john.whiting
Wed Jan 02, 2013 10:16 am
Forum: Four stroke
Topic: Flywheel alignment
Replies: 29
Views: 4643

I would check the flywheels for flatness where the pin flanges contact,a quick pass with a surface grinder would be ideal.This is the area of contact that will cause distortion if its not flat and parallel.Lapping tapers is not recomended,as ringing is the likely result.Scraping would be the preferr...
by john.whiting
Tue Jan 01, 2013 11:06 am
Forum: Four stroke
Topic: Flywheel alignment
Replies: 29
Views: 4643

Thats a nicely restored South Bend,must be a 10 or 11 judging by the flywheel size.I would not true flywheels between centres ,too many likely variables. To my knowledge ,only Harley and Indian ever used centres to check flywheels,English manufacturers recomend against it.Alpha used to turn out a tr...
by john.whiting
Sun Dec 23, 2012 11:07 am
Forum: Four stroke
Topic: VH Steel Flywheels as basis for custom crankpin
Replies: 8
Views: 1257

If you preheat,you will avoid hard weld.Depending on carbon and alloy content,preheat will range from 250c to 600c.Hard weld can be annealed by heating to dull red 600c and soaking for about 1hr.Can some one explain to me why beginners allways try to do an out of position weld on the front forks of ...
by john.whiting
Sun Dec 23, 2012 10:51 am
Forum: Ariel Talk
Topic: strange bolt head
Replies: 7
Views: 1326

Security nuts for mag wheels often have strange combinations of splines etc,and someone has probably driven on a convenient socket to remove a rounded plug.I thought all quality sockets were 12 point bi hex,impact sockets being usually six sided.When bolt heads on dozer final drive housings are worn...
by john.whiting
Thu Dec 20, 2012 10:26 am
Forum: Four stroke
Topic: Iron head bolt size ?
Replies: 6
Views: 1095

Very common to break off the corner lugs,my brother did it to a neighbours bike when he was 12.Assuming that the pieces are missing,you will need to build up the metal.If you use any arc weld process,you must preheat the head to at least dull red heat,or the welds will be hard and unmachinable.If yo...
by john.whiting
Sat Dec 15, 2012 10:02 am
Forum: Four stroke
Topic: VH500 main bearing size
Replies: 13
Views: 2235

R&M seem to have doubled their prices,but of course I didnt pay VAT. 34 quid for a ball,the're having a lend of you.5 would be closer to the mark.Go for the cheapest.Regards John.

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