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by Bob.Murphy
Fri Mar 15, 2019 10:06 am
Forum: For sale/wanted - Bikes
Topic: Ariel 500 OHV 1930 & 4F SQ4 & 1920 3.5HP in the CZ
Replies: 2
Views: 224

Re: Ariel 500 OHV 1930 & 4F SQ4 & 1920 3.5HP in the CZ

Vincent.vanGinneke wrote:In the CZ.

And a 1920 model


Now that's what I call a barn . . . I wonder what that large motor in behind the 'chair' came from (Combine Harvester ??).

Plus some interesting bits of machinery on the ground 8-) .

Bob.
by Bob.Murphy
Fri Mar 15, 2019 9:57 am
Forum: Four stroke
Topic: Mk11 Big End Shells STD
Replies: 8
Views: 161

Re: Mk11 Big End Shells STD

You could try F.W.Thornton, give Duncan Rowley a call.

Its just the sort of thing they would have in a dark corner!

http://www.fwthornton.co.uk/

Bob.
by Bob.Murphy
Thu Mar 14, 2019 11:10 pm
Forum: Four stroke
Topic: sq4 coupling gear pusher drawing
Replies: 2
Views: 123

Re: sq4 coupling gear pusher drawing

Dave,

The two-part tech drawing of the pusher/puller tools are here:

4G%20Coupling%20gear%20tools%20part%201.jpg




4G%20Coupling%20gear%20tools%20part%202.jpg



Bob.
by Bob.Murphy
Wed Mar 13, 2019 11:16 pm
Forum: Four stroke
Topic: Mk11 gearbox options
Replies: 22
Views: 446

Re: Mk11 gearbox options

It seems I spelt it wrong - it should have read "Gargoyle" (makes even less sense now):

https://www.mobil.com/en/industrial/lubricants/products/gargoyle-arctic-oil-300

Bob.
by Bob.Murphy
Wed Mar 13, 2019 11:06 pm
Forum: Main Chat Forum
Topic: Quicker by bike ...
Replies: 5
Views: 353

Re: Quicker by bike ...

Harry, I hope you have somewhere REALLY safe to park the Trident and 4G :shock: .

Bob.
by Bob.Murphy
Wed Mar 13, 2019 10:36 am
Forum: Four stroke
Topic: Mk11 gearbox options
Replies: 22
Views: 446

Re: Mk11 gearbox options

My 1931 M50 Panther (500cc heavyweight) has a three-speed Sturmey-Archer 240LS gearbox (which uses 'Gargoil' heavy oil - a bit like grease but it flows slowly so doesn't leave tracks). I don't know when Panther moved to Burman boxes, I'll have to dig out my copy of Barry Jones' "The Panther Sto...
by Bob.Murphy
Sat Mar 09, 2019 7:03 pm
Forum: Two stroke
Topic: Arrow/Leader Owners' Guide
Replies: 0
Views: 101

Arrow/Leader Owners' Guide

I was at the Scottish Bike Show today and got talking to Steve Brown who has a large collection of original and re-printed manuals for a variety of makes. While talking to him I spotted an original Owners Guide for the Arrow/Leader (dated 1964). Its the original item, complete with grubby finger mar...
by Bob.Murphy
Sat Mar 09, 2019 6:22 pm
Forum: Four stroke
Topic: VH Piston Ring Gaps:
Replies: 7
Views: 274

Re: VH Piston Ring Gaps:

Hmmm, maybe I'll give the oil control ring a smaller gap then. The bore is +20 thou and not badly worn - I get the same gap readings about 1.5 inches from the top of the bore as I do at the unworn part at the bottom. I'm a bit confused as to why the new compression rings start off with a gap of 0.01...
by Bob.Murphy
Fri Mar 08, 2019 11:18 pm
Forum: Four stroke
Topic: VH Piston Ring Gaps:
Replies: 7
Views: 274

Re: VH Piston Ring Gaps:

Thanks Dave, 0.005" seems a bit tight to me (I have memories of my 'VB' nipping up every time I climbed a hill :roll: ). I have spent some time going through various books: Waller - nothing specific for singles apart from a recommendation to change the rings when worn to 0.025" to 0.030&qu...
by Bob.Murphy
Fri Mar 08, 2019 10:54 pm
Forum: Main Chat Forum
Topic: Square Four screen/fairing
Replies: 3
Views: 195

Re: Square Four screen/fairing

I don't recall seeing a fairing on a Square Four but back in 1970-72 I used a "Tri-Point" screen which I found to be very good.

Are they still available ???

img297.jpg



img317.jpg



Bob.

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