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Messages - Arthur

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The Star and Garter / Re: Balancing on a bike
« on: 11 March, 2017, 12:08:05 »
The other characteristic of my Virago, is the way its track moves about on the road. It takes concentration to hold a line. My C15 holds well without effort.
I think there's something wrong with the suspension or wheel alignment on your Virago - a larger trail should make it want to go in a straight line and not want to go left or right.

The Star and Garter / Re: bsa b33
« on: 11 March, 2017, 12:03:16 »
The problem you have is that you have not have paperwork linking the frame number to a registration number, such as old tax disks or an old style log book. So, even if you knew the registration number, DVLA would not be able to issue you with a V5 for it.

Unfortunately, if you want an old style registration number (rather than a modern one), your only route is to apply for an age related registration number. The process for doing this is explained on the web site but, essentially, you will need an MOT'd bike to start with and then you will need to apply to the Dating Officer for a Dating Certificate. With this, an age related registration number and V5 can then be applied for from DVLA.

Even with the necessary paperwork linking the frame number and registration number, it can still be a bit of a pain getting a V5, although not quite as bad as the age related number route.

Singles / Re: B44 Head Gasket
« on: 10 March, 2017, 13:56:07 »

I contacted 3 more suppliers this morning and, although the head gasket thicknesses varied, the max thickness I was able to find was 44 thou. I have one more supplier I can try when he's back tomorrow who specialises in BSA unit singles and, if any one can provide a thicker head gasket, he will be the man.

If not then the next best solution may be to get the fire ring skimmed depending on the cost.

Singles / Re: WD B40 Fuse
« on: 10 March, 2017, 13:50:00 »
Sorry for being 'electrically dumb' but when you say "..on a 6V classic bike, 15/16A fuses should be ok with half that rating needed for a 12V system..." what amp fuse should I use?
I would go for 15A fuse whether it is a 6V or a 12V electrical system since it is basically protecting the wiring which is rated the same for both.

Singles / Re: WD B40 Fuse
« on: 10 March, 2017, 09:19:42 »
You need to use the lowest fuse rating possible to give maximum protection to the wiring harness. Normally, on a 6V classic bike, 15/16A fuses should be ok with half that rating needed for a 12V system. The particular type of fuse used (glass, continental, blade etc) doesn't matter very much since you're basically just protecting the wiring harness from damage.

Singles / Re: B44 Head Gasket
« on: 10 March, 2017, 07:05:35 »
The simplest solution would be to get a head gasket of the correct thickness. I'll normally have a go at making most things but I know making a head gasket without the proper tooling is way beyond my capability to do accurately enough. I'll try a few dealers this morning for you after I've mucked the horse out!

Singles / Re: B44 Head Gasket
« on: 09 March, 2017, 17:32:21 »

There are some other suppliers who might have one - I'm happy to give them a ring tomorrow morning and will let you know how I get on.

In terms of making one, I think you may be being a bit optimistic unless you've got the necessary tooling to do this accurately - trying to make one using hand tools would be very difficult. The last thing you want is for the head gasket to fail a few weeks after putting the bike back on the road!

Singles / Re: B44 Head Gasket
« on: 09 March, 2017, 12:51:13 »

I would try phoning a few of the normal suppliers and ask what thickness they have available - hopefully, one will have a 47 thou head gasket for you. Unfortunately, they can be found with a variety of thicknesses with 36, 40 and 47 thou being the usual sizes.

Twins / Re: A65 Lightning carburettors
« on: 08 March, 2017, 17:36:26 »
Data listed for your 1968+ engines with those valve sizes and compression ratio are:


930/34 + 930/35
main:         180
Needle jet:  106
slide:          3.0 cutaway
pilot:          20


main:         230
Needle jet:  106
slide:          3.5 cutaway
pilot:          20

The Star and Garter / Re: BSA Thunderbolt OCY 681 F
« on: 08 March, 2017, 17:07:33 »
Doesn't look as though it's been taxed since 1989!

Twins / Re: my old bike ,super rocket
« on: 07 March, 2017, 06:41:40 »
Try asking the question on the A7-A10 forum and you might have more luck:

Singles / Re: Fork Stanchion Bottom Nut
« on: 06 March, 2017, 19:51:29 »
I normally just use a large adjustable spanner but you usually have to apply a bit of heat to undo them. Not sure it's takes a hexagonal socket because it has rounded corners on the hexagonal nut. Closest is probably 11/16 Whitworth.

Twins / Re: A65 - Engine spacers
« on: 06 March, 2017, 18:13:05 »
The later A65's used a standard distance piece 68-688 with a thickness of 0.295" (TBC) + shims of various thickness (40-66 10 thou, 40-69 15 thou).

Twins / Re: A65 - Engine spacers
« on: 06 March, 2017, 17:32:51 »
These are engine sprocket distance pieces with the following dimensions:

68-686:  0.330" - 0.334"
68-687:  0.311" - 0.315"

Twins / Re: Engine numbers
« on: 05 March, 2017, 13:30:06 »
The engine number appears to signify that it is either an A65R or an A65T from the 1964 season, ie Aug 1964 - Jul 1965. The frame number prefix looks to be a bit more confusing with one list signifying that a prefix of A50B makes it an A65R while a plain A50 prefix makes it an A65T. Other lists don't seem to make this distinction with the frame number.

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