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Messages - Trev

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Twins / Re: A10 Chrome Headlight Brackets
« on: 03 July, 2019, 08:47:13 »
Need to get a pair of Chrome headlamp brackets for my SR ( separate headlight ) but I am struggling to identify the part no
Yes, you need to be careful. Unit twin brackets are a different size, and have slotted headlamp fixing holes. Often on ebay you will see brackets listed as being suitable for both applications. They are not. I bought mine (RGS) from George Prew and they were NOS. Give him a call and see if he still has any. You need a dealer that does RGS and Goldie stuff.

Twins / Re: A10 gearbox condrum
« on: 27 April, 2019, 10:57:58 »
Hi Trev, was it the same before using the ATF an oil change might help,just a thought.
Roy, I have only ever used ATF
I wondered, for want of any other explanation, whether the plates were expanding (getting thicker) with the heat, perhaps caused by a slightly slipping clutch.
Dean, I cannot say with absolute certainty that the clutch is not slipping but I does not feel like it is. What ever is causing the problem it is heat related, and it is very likely that the plates could be expanding in some way. The thing is why, and how if this is indeed the case. I have toyed with backing the springs off a bit to see if that makes any difference. Just for clarification it's a 4 spring clutch with Surflex plates. I have also tried new springs.

Twins / A10 gearbox condrum
« on: 26 April, 2019, 15:52:56 »
Now, here's a little puzzle. When cold, gear selection is perfect, absolutely smooth and free from any crunches. First goes in silently at rest and neutral can be selected easily when stationary from either first or second. So far so good, now here's the thing, after a few miles everything changes. Neutral can only be selected when rolling and the change becomes progressively more notchy this especially noticeable changing between second and third. My guess is that as the clutch warms up it is not freeing off properly. The clutch is in good condition and it has been fitted with an SRM ally pressure plate and radial release bearing on the push rod. It runs in ATF. I have spent many hours checking the run out to ensure that it lifts cleanly (even resorted to using a dial gauge) and it is always the same thing. Initially everything is fine, until things warm up then the problem returns. Anyone got any suggestions about what could be the cause. I am at a complete loss as to what to do next, and it's getting to the point where I don't get any pleasure from riding it.

Singles / Re: c 11 clutch issues
« on: 06 March, 2019, 16:31:49 »
Worth posting your question here: excellent "C" series knowledge base

Twins / Re: A65l gearbox driven speedo
« on: 27 September, 2017, 14:15:37 »
Yes found it: Chronometric up until 1974 Source:
Chronometric Speedos were fitted to motorcycles up to 1963 and on police motorcycles up to 1974

Twins / Re: A65l gearbox driven speedo
« on: 27 September, 2017, 13:59:17 »
Is the speedo chronometric or magnetic?
Did not the police only use chronometric?

Twins / Re: a7 oil tank dowty seals?
« on: 14 September, 2017, 10:53:52 »
Anyone tried dowty seals instead of fibre washers on the oil tank banjo on a 1957 A7? If so what sizes did you use
Sorry I can't answer your question about the size of seal required, but I am about to try this out myself. In my experience dowty seals do work really well. Dowty seals proved to be the solution to the persistent leaks that I experienced on the rocker cover oil supply banjos. Others may have alternative views, but I have never found fibre washers to be satisfactory at sealing anything. I have also used a dowty seal to good effect on my SRM sump plug. Previously I had used both fibre washers and copper washers in this application and no matter what they always allowed oil to seep out. I should also mention that I have also used a dowty washer to effectively seal the gearbox drain plug wich and previously always had a tendency to weep. As you probably know dowty seals are widely used to seal hydraulic systems and if they can hold back leaks in a hydraulic system they are more than adequate for sealing BSA oil joints.

Singles / Re: B31 loose valve guide
« on: 01 September, 2017, 09:45:15 »
cylinder head shop in London
Yes, I agree, he did my A10 ally head wich had the exact same problem that you describe. Made a very good job of it. and of course he knows the correct tolerences wich is important.

Twins / Re: Steering lock removal 1972 Thunderbolt
« on: 10 August, 2017, 19:34:29 »
Julian, thank you for showing that, and it does indeed look as if that plug has to be dug out before the grub screw can be accessed. I wonder how that is done. Could turn out to be an interesting challenge!

Twins / Re: Steering lock removal 1972 Thunderbolt
« on: 10 August, 2017, 18:48:49 »
The parts book shows what it describes as a sealing washer over the grub screw.
Julian I cannot see that in either of my parts books, but I am not saying that is not the case. It might well be, however as far as I can remember, the grub screw that retained my lock barrel needed an allen key to undo it. So A10 JWO try poking some different sized keys in there and see if you can locate one of them in the screw hex. It is quite possible that the hex keyway has got plugged up with grease and dirt over a period of time. With luck and god on your side you should be able to get a key in far enough to release the screw. That is the way it was when I did mine.

Twins / Re: Steering lock removal 1972 Thunderbolt
« on: 10 August, 2017, 12:00:57 »
I forgot to mention this. Try not to loose the grub screw, not all new locks come supplied with one. As you might imagine there is a very good reason why I happen to know this.

Twins / Re: Steering lock removal 1972 Thunderbolt
« on: 09 August, 2017, 13:52:58 »
It will be held in place with a grub screw.

Twins / Re: Fitting of M20/21 girder forks to a late A10 frame
« on: 03 August, 2017, 19:39:32 »
PS I enjoyed looking through your website. I shall be paying another visit or two. You passed very close to me when you ventured North over the Humber Bridge. I presume you got through the Yorkshire border control point without too much difficulty
No, no, Greybeard, I am not he. Laurence is a mate of mine. Actually it is sometime since I have had any contact with him. The word on the grape vine is that he no longer rides his bikes, but he still has them.

Twins / Re: Fitting of M20/21 girder forks to a late A10 frame
« on: 03 August, 2017, 17:50:38 »
Is possible to fit M20 girder forks to a late A10 frame?
As you can see it can be done. If you want details of what was involved visit the website

Twins / Re: A10 Dynamo belt-drive conversion and Rodark panniers
« on: 02 August, 2017, 10:35:12 »
tried several types, but DVR the best.
I agree, the best there is.

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