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by Pete.Silson
Thu Oct 11, 2018 7:19 pm
Forum: Ariel Talk
Topic: 4G Rocker box breather?
Replies: 10
Views: 1033

4G Rocker box breather?

rocker cover.jpg Does hole in the centre of a 4G rocker box lid serve any purpose other than to keep the underside of the petrol tank free of rust? When the engine is warmed up I find that I get a steady mist of oil from the hole - enough to eventually get onto the cylinder head resulting in a smok...
by Pete.Silson
Mon Oct 08, 2018 2:35 pm
Forum: Four stroke
Topic: 46 SQ4 petrol tank drain hole
Replies: 10
Views: 704

Re: 46 SQ4 petrol tank drain hole

John Attached picture is from a 1946 4G tank which has no drain hole. I am certain this is an original 1946 petrol tank since I know the history of the machine so maybe yours is an earlier tank than mine. I have found other examples of prewar SQ4's with the fuel tap forward of the mounting bolt (lik...
by Pete.Silson
Sun Sep 09, 2018 12:18 pm
Forum: Ariel Talk
Topic: Telescopic Fork Geometry
Replies: 14
Views: 1075

Re: Telescopic Fork Geometry

Looking at the pictures, the later fork legs are parallel to the steering axis whereas the the earlier arrangement angle away. I wondered how this changed the handling characteristics particularly with a sidecar attached.

Pete
by Pete.Silson
Sat Sep 08, 2018 1:58 pm
Forum: Ariel Talk
Topic: Telescopic Fork Geometry
Replies: 14
Views: 1075

Telescopic Fork Geometry

My 1939 SQ4 bitsa was fitted with a sidecar at some point in its life and the girder front end swapped for telescopic (probably from a Mk1). Now that I have partially assembled it I see that the steering geometry of this setup is different from the earlier post-war telescopic 4G’s (pictured below). ...
by Pete.Silson
Fri Sep 07, 2018 10:55 pm
Forum: Ariel Talk
Topic: Gearbox markings and dating of bike
Replies: 14
Views: 905

Re: Gearbox markings and dating of bike

Bevan,

From the numbers on your (brass) plate in your picture: MO1/4 465109 AC20 742 I believe makes this a WD MO1 of April 1941 vintage not a civilian issue (hence not listed in the post-war Lucas parts book).

Pete
by Pete.Silson
Fri Sep 07, 2018 5:49 pm
Forum: Ariel Talk
Topic: Gearbox markings and dating of bike
Replies: 14
Views: 905

Re: Gearbox markings and dating of bike

To the best of my (somewhat limited) knowledge: G107 is a BA gearbox, J is September (A=January etc.), 50 is 1950. VB's from 1950-54 were fitted with MO1L Magdyno, Serial: 46028A/B (this should be stamped on the plate also). Before 1950 they were fitted with MO1 (no L) Serial: 46013A/H. RB engine pr...
by Pete.Silson
Fri Aug 17, 2018 11:20 am
Forum: Four stroke
Topic: BA/CP gearbox outer case lubrication
Replies: 6
Views: 569

Re: BA/CP gearbox outer case lubrication

Attached are photos of three generations of square four BA gearbox covers that might be of interest. The first is a 1939 box and has four grease points on the outer case. 1 Kickstart 2 Outer case 3 Speedo drive 4 Inner case - there is a hole drilled right through both outer cases to the inner case. ...
by Pete.Silson
Sun Jun 10, 2018 10:53 pm
Forum: Four stroke
Topic: Mystery Noise
Replies: 2
Views: 298

Re: Mystery Noise - Oil pump wear?

Paul The camshaft and the followers were in amazingly good condition and were put back into the engine in the exact order and orientation that they came out so I hope that isn't the issue. I really don't want to have to strip the engine down to the cam followers now the bike is running. I did howeve...
by Pete.Silson
Sat Jun 09, 2018 5:11 pm
Forum: Four stroke
Topic: Mystery Noise
Replies: 2
Views: 298

Mystery Noise

I am trying to identify a tapping noise from my iron 4G engine. I have just got it back together and am doing some initial road tests. It starts and runs well but is mechanically noisy. I expected a bit of piston slap since it is running on original bores and pistons but there is also a definite tap...
by Pete.Silson
Sat Jun 02, 2018 12:51 pm
Forum: Main Chat Forum
Topic: Lucas Rubber Edge Bead P/N 516442
Replies: 6
Views: 625

Re: Lucas Rubber Edge Bead P/N 516442

The picture below is a DU42 of 1946 vintage with the original beading in place. It is a solid circular section rubber bead laced through six small holes. The nearest modern equivalent I have found is 2mm nitrile O-ring cord such as: http://www.ebay.co.uk/itm/METRIC-O-RING-CORD-NITRILE-RUBBER-PER-MET...

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