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by john.whiting
Fri Sep 30, 2011 1:38 pm
Forum: Four stroke
Topic: Rebuild - Spacer required?
Replies: 6
Views: 1383

A slight discrepancy on the inner spacer,this dimension must be shimmed to centralize the flywheels,no matter what size is quoted .The between bearing spacer must be exact,say+or- .002 or the bearings will be endloaded by the spring,the outer spacer sets the chainline and is not so critical,say +or-...
by john.whiting
Thu Sep 29, 2011 1:37 pm
Forum: Electrics
Topic: Contact breaker problems
Replies: 12
Views: 3923

The maggie jamming up might be due to the paper bearing mount being u/s.Ive seen bearings mounted in masking tape,and insulation tape.If you decide to pull your mag to bits,dont forget the SAFETY GAP SCREW,it must be removed before the armature.Yes I have seen magdyno mags used as points in a coil s...
by john.whiting
Thu Sep 29, 2011 1:08 pm
Forum: Four stroke
Topic: Rebuild - Spacer required?
Replies: 6
Views: 1383

You need three spacers on the drive side,one of.165in next to flywheel,one between ballbearings.285in,one between ballbearing and sprocket.586in.The genuine parts are of hard steel,but if missing,Ive made them out of mild steel bar,as they are all tightly held together by the drive spring and the on...
by john.whiting
Thu Sep 29, 2011 12:29 pm
Forum: Four stroke
Topic: 1929 Sidevalve valve/tappet lubrication
Replies: 3
Views: 833

Most old bikes had no lubrication for the valve stems,or used a bit of blowby from the crankcase.WW2 Norton 16h still only had grease fittings.For valve caps,I have in the past used a ring of bare copper wire,one turn crossed over and squashed as the cap screws down.Now I use a copper gasket from a ...
by john.whiting
Wed Sep 28, 2011 11:59 am
Forum: Four stroke
Topic: 1930 Burman Q Help Required!
Replies: 6
Views: 998

Dave I hope you never pull a Rudge gearbox down, theyre full of loose needle rollers. Remove the gears with a small puller or a soft hammer,heating wont get you anywhere.Refitting is pretty easy,just check that it changes ok when youre finished.Regards John.
by john.whiting
Wed Sep 21, 2011 11:17 am
Forum: Ariel Talk
Topic: Help needed on 51 VH500
Replies: 33
Views: 3807

My oil tank is definitely from a twin, buts fitted to my 50VG, and it only has one hole for the top strap[not fitted].The mounting holes lined up as I remember.I got the twin from an add in the paper, as my VG was about to become a chopper, the forks had been cut, and a peanut tank fitted.I used the...
by john.whiting
Mon Sep 19, 2011 1:03 pm
Forum: Ariel Talk
Topic: Thread
Replies: 1
Views: 562

Hello Olaf, the thread you need is called BSP [British Standard Pipe] , Ariels generally used 3/8 BSP, most fuel taps are 1/4BSP, so you need a bushing.In some countries a metricised equivalent is available, some like Italy use a totally different metric thread.,not interchangeable. Imperial Pipe th...
by john.whiting
Fri Sep 09, 2011 12:28 pm
Forum: Four stroke
Topic: Help needed on '49 500VH rebuild
Replies: 6
Views: 1241

Some years ago one of the mags published the factory drawings for the valve gear. The lifters should have a 1/2 in radius on the cam contact . If your wear is more than say 40 thou then the case hardening is worn thru.This can easily be tested with a small file. Regards John.
by john.whiting
Thu Sep 08, 2011 11:36 am
Forum: Four stroke
Topic: Kickstart stop peg - BA gearbox
Replies: 10
Views: 2350

I might mention that if you get the camshaft timing out, often the box will change OK, but with only partial engagement of either first or fourth, causing breakdown of the clutch teeth on the gear pair ,and eventually resulting in jumping out of gear. Repair means replacing both gears.Burman BA and ...
by john.whiting
Thu Sep 08, 2011 11:18 am
Forum: Ariel Talk
Topic: Fitting chain guards to rigid VH
Replies: 7
Views: 1060

Keith, my 1950 VG has a tab welded to the tubular mudgard stay, horizontal, and angled back slightly. No brake stop that I can see. Does the 1950 VH have the lower chaingard ?I once had a very original VH, that had it.I got it free because the carby and mag were melted.,but it must have been a 1951,...

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