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Messages - AWJDThumper

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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.

Twins / Re: A65 - O rings
« on: 04 March, 2017, 23:57:31 »
The sizes of some of the O-rings are available. What year is your A65?

Twins / Re: A65 - O rings
« on: 04 March, 2017, 15:29:04 »
The A65 engine only uses a handful of O-rings and some of these are available from parts suppliers under the appropriate part numbers. For less critical ones, for example, as a seal for the oil release plug, it is normally sufficient just to pick an appropriate imperial size from an O-ring set.

The Star and Garter / Re: Replcement engine
« on: 04 March, 2017, 10:09:07 »
It's not a Dating Certificate I was recommending which, of course, only the Dating Officer can provide. However, a forum member previously posted that he was able to get the despatch information for his bike from the General Secretary relatively quickly which is what I was suggesting this member try.

The Star and Garter / Re: Replcement engine
« on: 04 March, 2017, 08:17:32 »
Are you saying that you bought the bike on the basis that the engine and frame number matched but you have now found that the engine number is different and relates to post-1969? Or are you saying the numbers still match but there is some feature you can see on the engine cases which makes them post-1969?

Either way, if you contact the club's National Secretary and tell him what the frame number and engine number is, he'll be able to tell you when it left the factory and in what form (hopefully, as an A65T).

Singles / Re: Wiring loom / harness
« on: 04 March, 2017, 07:59:17 »
Can you provide a picture of the wrong wiring harness you've got so that we can try to identify what it's off. The harness needs to be laid out flat, fully extended to be able to do this. If we can identify what it's off then someone on the forum might want to buy it off you.

Twins / Re: A65 Oil pump diffences
« on: 03 March, 2017, 16:50:38 »
Sorry, 1/4" ball bearing  :)

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