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by john.whiting
Sun Mar 08, 2015 9:31 am
Forum: Four stroke
Topic: square four temperature
Replies: 39
Views: 7019

Re: square four temperature

You should read the story of the first test ride on a new pushrod four by Harry Louis in 1936.As he was going to lunch at a posh club with Jack Sangster,he was told to take the bike for a short run.When he returned ,one of the engineers waiting said to him"How hot do you think the crankcase is?...
by john.whiting
Sat Feb 28, 2015 10:06 am
Forum: Main Chat Forum
Topic: One pecenters crushed.
Replies: 10
Views: 2028

Re: One pecenters crushed.

It will be interesting to see what the new govt does. The Qld laws have a 3 year sunset clause [2016] anyway.The bikies set themselves up for it,by declaring on the telly that they ran Qld,and giving the cops 24hrs to get out ,before they came gunning for them.Of ,course bikie shootouts in crowded s...
by john.whiting
Fri Feb 27, 2015 10:08 am
Forum: Main Chat Forum
Topic: One pecenters crushed.
Replies: 10
Views: 2028

Re: One pecenters crushed.

Effective-you bet.I havent seen a 1%er for ages.Except getting busted every night on the telly.The biggest effect of these laws is to break the aura of invincibility the bikies had.They have lost the power to make witnesses disappear or permanently forget.In the recent state election, the mean scots...
by john.whiting
Mon Feb 23, 2015 9:49 am
Forum: Four stroke
Topic: Sheared Sump Cover Bolt - Advice
Replies: 11
Views: 1699

Re: Sheared Sump Cover Bolt - Advice

Dont use the cheapie stud extractors,that are a twisted taper,they will break off,leaving hard steel in the hole.Use the straight spline type,the Rigid extractors never break and are excellent but expensive.I think Facom make the same type.Make sure the hole is centered and straight.My advice is to ...
by john.whiting
Sat Feb 21, 2015 9:13 am
Forum: Four stroke
Topic: Overheating/ignition timing
Replies: 16
Views: 2296

Re: Overheating/ignition timing

Take the points cap off the mag.See which way the camring turns[if you have the correct Lucas,it will have a ring cam and rocker]when you work the controll.The mag rotates the opposite way to the back wheel,[to simplify things]So when the cam ring turns the same way as the back wheel,you are advanci...
by john.whiting
Fri Feb 20, 2015 9:24 am
Forum: Main Chat Forum
Topic: Corrosion treatment
Replies: 13
Views: 1863

Re: Corrosion treatment

I think you are going to need the traditional lightning bolt to bring that bike back to life.Regards John.
by john.whiting
Fri Feb 20, 2015 9:20 am
Forum: Main Chat Forum
Topic: Rocker arm help
Replies: 15
Views: 3904

Re: Rocker arm help

You can buy hardened and tempered 4140,Rc around 41,[4140HT].It machines well with insert tooling,can be drilled with ordinary HSS drills,and has tensile strength in the 800-900 MPa range.Not forged ,obviously,but if you make them yourself,and eliminate expensive heat treatment,then a failure is not...
by john.whiting
Thu Feb 19, 2015 9:30 am
Forum: Main Chat Forum
Topic: Rocker arm help
Replies: 15
Views: 3904

Re: Rocker arm help

I think I would be looking at car rockers,possibly from the ninetys,when 2valve motors were still in force.I reckon if I was still in the auto repair business ,I would find rockers to suit without any trouble.Before you say they wont stand the revs,a lot of cars rev higher than any thirties bike eve...
by john.whiting
Mon Feb 16, 2015 9:27 am
Forum: Four stroke
Topic: 9/16x20 LH die nut
Replies: 4
Views: 978

Re: 9/16x20 LH die nut

Its not really UNF,the similarity is coincidence.Many British bikes use 20tpi as a fine thread on things like mainshafts,and crankpins.The thread form used is actually cycle,which does approximate UNF.I dont believe in recutting tight threads with a die ,they generally end up wrecked.Its better to h...
by john.whiting
Sun Feb 15, 2015 9:25 am
Forum: Main Chat Forum
Topic: Burman Gearbox types
Replies: 4
Views: 1143

Re: Burman Gearbox types

Its just a prewar CP Burman.Regards John

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