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Messages - JulianS

Pages: 1 [2] 3 4 ... 39
Singles / Re: new look B44
« on: 30 November, 2017, 20:47:39 »
Looks good to me also!

Singles / Re: M20/M21 block
« on: 30 November, 2017, 14:12:20 »
Parts book shows the same part number for both.

Twins / Re: Bsa crank bushing size?
« on: 28 November, 2017, 13:43:02 »
I think the point to consider is if you journal is within limits of ovility to give proper fit in the bush.

Twins / Re: LED h/light conversion
« on: 28 November, 2017, 13:40:52 »
Will depend on what headlight unit you have and on the space within the unit.

H4 LED usually have some sort of heat sink which takes extra space.

You could consider a low wattage HS1 bulb which will fit in place of an H4 if the top mounting of the bulb is thinned a bit. 35/35 watt Osram night racer.

I did try a BPF type LED whic was a disaster - dipped beam too low.

Twins / Re: Bsa crank bushing size?
« on: 27 November, 2017, 18:53:32 »
This page from the A65 manual may assist.

You do need to check that the journal is perfectly circular.

Singles / Re: B31 competition exhaust
« on: 26 November, 2017, 21:16:48 »
BSA fitted such a system to the iron engined B32.

Below from 1947 catalogue.

The Star and Garter / Re: Fuel Tanks (again)
« on: 26 November, 2017, 20:47:36 »
Aging tanks, internal rusting and rechroming can open up pin holes in steel tanks.

Ethanol eats away some of the older spec sealants.

Singles / Re: C15 No Spark
« on: 25 November, 2017, 13:12:45 »
The coil body does not form part of the ignition circuit, it is just a container for the insulated primary and secondary windings and their core.

Should either winding be earthed through the body then there would be no spark.

To operated, the coil primary winding has battery voltage applied to one side and, when points are closed, the winding is earthed and a magnetic field builds up around core. When the points open the field collapses and a high voltage is induced into the secondary winding which goes via the plug gap (spark) to earth.

Pre War / Re: 1932 Blue star HELP!
« on: 24 November, 2017, 11:51:04 »
Contact detail for Jules will be found in The Star the BSAOC magazine.

Twins / Re: Identifying the age of a unit bottom end.
« on: 22 November, 2017, 20:58:59 »
Post some photos we may be able to identify.

Any casting numbers?

Twins / Re: A10 Squealing like a pig!
« on: 22 November, 2017, 09:49:19 »
Remove the primary chaincase and you will expose the gearbox sprocket.

Two possible causes of leaks -

First the large top hat seal behind the sprocket retaimed by a circlip - sometimes dificult to get the new seal in the hole as they seem to be very slighty larger diameter than the original.

Second - oil leaking along the bushes in the sleeve gear, usually worse when bike on the side stand. SRM do a neat sprocket retaining nut which includes an oil seal which sorts this out.

Twins / Re: A10 valve / tappet clearance
« on: 21 November, 2017, 11:34:33 »
You have a choice of any of the above - try and see which suits best.

Eddie Dow tuning notes attached.

Twins / Re: A10 valve / tappet clearance
« on: 21 November, 2017, 10:29:13 »
Not seen a factory figure for iron head and Spitfire cam. All the Spit figures seen for light alloy heads.

I ran such a combination for a few years and ran on 8/10 thou inlet/exhaust no problems. Also tried Eddie Dow recommended figure of 10/12 thou. Also fine no problems.

Attached is factory service sheet which has been annotated but do not know by whom.

I think you try various settings and see what is best. 10/16 will probably rattle a bit.

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