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Messages - JulianS

Pages: 1 2 [3] 4 5 ... 33
Twins / Re: 1971-72 Thunderbolt Petrol Tank Identification.
« on: 09 October, 2017, 19:35:03 »
Photo might help.

Singles / Re: B31 breather
« on: 09 October, 2017, 09:44:44 »
If you decide to blank off the breather you need to arrange a suitable alternative breather or you will find the bike will leak oil all over the place, there being nowhere for crankcase pressure to go except though the joints or via the main bearing into the primary chaincase.

That breather was fitted from about 1948 right through to the end of production.

Before 1948 it was fitted near the drive side main bearing boss and the timing cover was a different part.

I would look for other causes of oil discharge.

Singles / Re: C15 Forks question
« on: 09 October, 2017, 09:34:53 »
It is just a spacer tube and may be a tight fit in the fork bottom. It was fitted to all the C15 lightweight forks.

Singles / Re: Victor Special Tank
« on: 08 October, 2017, 22:26:30 »
Mind the ethanol does not eat your glass fibre tank.

The Star and Garter / Re: B31
« on: 08 October, 2017, 13:21:05 »
Rivet counters are sad individuals!!

Does it matter what they say or think, our bikes are our bikes to be presented and used the way we wish.

When you next see him tell him that the BSA season year for 1956 started in the latter half of 1955. same for other years.

January was not the change over month, you would have thought Mr Rivet Counter wouldknow that!

I presume you frame number starts EB31 - which means it should have Ariel type hubs.

The photo is from Glass's motor cycle check book 1946-1958 issue.

Twins / A65 cylinder flange cracking?
« on: 07 October, 2017, 20:30:06 »
Found this USA service sheet from 1969.

Has anyone actually suffered or seen such damage, I certainly have not.

Twins / Re: A65 Cylinder head
« on: 07 October, 2017, 15:55:41 »
First photo frpm 1962-65 workshop manual showing valve sizes.

Second photo from 1966-68 workshop manual showing valve sizes, which stayed the same until the end.

Twins / Re: A65 Cylinder head
« on: 06 October, 2017, 11:39:35 »
The service bulletins below might help.

Could you post photos?

Twins / Re: 1971 A65L crankshaft
« on: 05 October, 2017, 10:40:28 »
Half the stroke of engine, which is 74 mm.

Unfortunately when the reords were computerised in the 1970s nobody checked that the numbers on the old documents matched the numbers on the bike and I think that this is probably how your V5 got the wrong frame number.

Do you have any old MOT certificates which show the frame number - numbers have been included on MOT for the past 25 years or more - not unusual for testers to copy the number from the V5 rather than read from the frame - you may actually have the V5 frame number.

It is worth getting a dating certificate from the BSAOC then you will know exactly what you have and will then be able to consider your options.

Consider applying for an age related plate rather than the "Q" plate.

Is there anything unusual about the number - does it look like a BSA number and in the appropriate sequence for 1955. Sometimes numbers and letters have been misread and misrecorded- S mistaken for 5 , 2 mistaken for Z, 7 mistaken for Z, C mistaken for G and sometimes numbers missed out because of faint stamping or thick paint, others as well.

Twins / Re: A10 Super Rocket cases
« on: 02 October, 2017, 20:19:29 »
Just seen item on ebay.


The dynamo mounting cradle has been mostly ground off. You will not be able to mount a dynamo.

Twins / Re: A10 Super Rocket cases
« on: 02 October, 2017, 19:58:53 »
I agree. Looks like someone has used a "P" stamp and tried to alter it to an "R".

Also would expect to see either HC or HHC stamped below the number.

Twins / Re: A10 swingarm fitment
« on: 02 October, 2017, 09:40:40 »
I have found that to remove and to refit the swinging arm it is necessary to tap it up one side and down the other side on the bush housing to twist it to allow removal and subsequent refitting.

It is necessarily tight to allow the inners to be clamped against the frame plates when the spindle nut is finally tightened.

Most of us have reduced the clearance because the commonly used powder coating is somewhat thicker than the original stove enamel finish.

On my A10 swinging arm the bushes protrude about 1/16 inch each side giving zero clearance when fitted and before tightening. I see some bushes are advertised as being 4 3/4 inch total length which seems to me a bit too long given that the dimension between frame plates is given as 9.373 - 9.383 inches. Just my opinion.

Be carerful filing the bush ends - there is often little clearance between and assembled swinging arm and the pillion footrest frame loop on the chain side and with filing you could reduce it to zero!.

The Star and Garter / Re: Rocket Gold Star inner primary chain case
« on: 01 October, 2017, 19:05:16 »
If you want to buy an RGS then the main thing is research and more research and when viewing to see a detailed and verifiable history including a dating certificate.

Dont rely on  photos in the current classic press of newly restored bikes, research contemporary photos.

And remember that only 1582 were produced. Of those perhaps half were exported to the USA, where they were either sold as scramblers or  Gold Star twins (not RGS) with twin pipes, so maybe only around 700 or 800 or so are real genuine UK market Rocket Gold Stars.

With such a low production run maybe there is no definitive answer or record as to exactly which parts were fitted.

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