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by Bob.Murphy
Fri Jun 21, 2019 12:35 pm
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 916

Re: Lathe user?

According to my Thread Charts, Cycle Engineers' Institute (CEI) - which metamorphosed into British Standard Cycle (BSCY) used a 60 degree thread angle. Which makes 1/2" UNF / CEI the same. Some sizes were dropped when the new standard was compiled. My chart doesn't show 1/2" CEI. Confused ...
by Bob.Murphy
Fri Jun 21, 2019 11:18 am
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 916

Re: Lathe user?

Right, The threads mentioned have the following pitches: British Standard Whitworth (BSW) = 1/2" x 12 British Standard Fine (BSF) = 1/2" x 16 Unified Fine (UNF) = 1/2" x 20 British Standard Cycle Thread (BSCY) = 1/2" x 26 BertieB is using a Tiger Cub rear hub in his 'LF'. I have ...
by Bob.Murphy
Wed Jun 19, 2019 10:46 am
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 916

Re: Lathe user?

Thanks folks, As I thought - BSCY it will be.

All the dimensions on the CAD drawing are in MMs ( :? ), fortunately I have a couple of Tiger Cub spindles and will use them to get the accurate dimensions.

Ariel spindle (1).pdf
(65.72 KiB) Downloaded 20 times


I'll try to get Bertie's approval before I proceed though ;) .

Bob.
by Bob.Murphy
Wed Jun 19, 2019 10:29 am
Forum: Main Chat Forum
Topic: Man and sloper come a cropper.
Replies: 14
Views: 931

Re: Man and sloper come a cropper.

Glad to hear that you are on the mend and hope you make a full recovery and get back on the bikes. From (thankfully limited) experience, the priorities after an 'off' are: 1. Rush to the bike. 2. look for your passenger. 3. Eventually think about yourself. :lol: Chin up - and keep posting on here, w...
by Bob.Murphy
Tue Jun 18, 2019 11:25 am
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 916

Re: Lathe user?

Folks, BertieB sent me his CAD drawing and it shows the wheel spindle threads as 1/2" Whitworth. I think this would be too coarse and should maybe be 1/2" BSF or BSCY. I have send him two PMs but they're still sitting in my outbox so he isn't watching this site at the moment. Any thoughts ...
by Bob.Murphy
Tue Jun 18, 2019 10:42 am
Forum: Four stroke
Topic: Mk1 Relief Valve
Replies: 2
Views: 181

Re: Mk1 Relief Valve

A good idea 8-) .

I recall fitting a small washer over the end of the spring for just this reason. Fiddling it into place with a pair of snipe-nosed pliers was a bit of a challenge but it did the job.

Bob.
by Bob.Murphy
Mon Jun 17, 2019 11:54 am
Forum: Four stroke
Topic: Thorspark Electronic Ignition on a VH
Replies: 24
Views: 868

Re: Thorspark Electronic Ignition on a VH

Well, I have ordered a simple baffle that will be held in the silencer tailpipe by a single bolt. It will be interesting to see what effect it has. Nothing is ever simple of course, the nearest baffle diameter I found was 35mm - but the ID of the tailpipe is 37.65mm (1.482 inches - presumably 1.5 in...
by Bob.Murphy
Sat Jun 15, 2019 11:50 am
Forum: Four stroke
Topic: Thorspark Electronic Ignition on a VH
Replies: 24
Views: 868

Re: Thorspark Electronic Ignition on a VH

No rattles and no tealeaf ! I have had a search on e-Bay and also watched some u-tube vids but I'm still confused as to where these things fit when one has a simple pipe and silencer. The perforated pipe that Steven bought looks the thing - but does it go into the pipe before the silencer is fitted ...
by Bob.Murphy
Fri Jun 14, 2019 6:15 pm
Forum: Four stroke
Topic: Thorspark Electronic Ignition on a VH
Replies: 24
Views: 868

Re: Thorspark Electronic Ignition on a VH

Keith, You have just fitted a silencer from Armours . . . I'd like to compare notes. My '58 VH has an "Ariel motors' silencer, and very nice it looks too: DSCN8864.jpg DSCN8865.jpg It has always had a fair 'Bark' and will rattle the windows if I open it up - even motorway bridges aren't immune ...
by Bob.Murphy
Fri Jun 14, 2019 3:59 pm
Forum: Four stroke
Topic: Thorspark Electronic Ignition on a VH
Replies: 24
Views: 868

Re: Thorspark Electronic Ignition on a VH

Thanks folks. Eero, I had noted in the past that people were running 180 main jets, yet mine had a 200 in it. Higher compression means more efficient running so I bought a range of jets and went down to 180. It seems to be running cleaner now. Keith. I have disturbed a whole load of things and the m...

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