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Messages - JulianS

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Twins / Re: carb jet confusion
« on: 09 March, 2017, 12:22:22 »
Your 1966 Lightning would originally have been fitted with a pair of 1 5/32 inch monoblocs.

The later Lightnings were fitted with a pair of 30 mm concentrics.

Your 300 and 301 carbs are "generic" 32 mm concentrics recent pattern. I presume they are standard ones rather than the premier version with the upgraded idling system

I think you will have to experiment to get the carb settings  correct because of the non standard size carbs, but suggest that you start with the jetting for the A65 Spitfire MK3 which also had 32 mm concentrics.

Spitfire specs were 190 mains, 107 needle jets and needle in position 2. The pilot jet in your carb would have been a pressed in pilot bush.

There is a lot of information available on the Amal website. Worth viewing.

This link takes you to the standard spec for 932/300 supplied by Amal.

Singles / Re: B44 Head Gasket
« on: 09 March, 2017, 10:19:09 »
The raised lip was originally introduced to prevent leakage.

Have you considered getting one from the USA?

These come in 50 thou;

The Star and Garter / Re: Truro dealer
« on: 08 March, 2017, 21:04:29 »
Advert from The Motor Cycle September 2nd 1965

The Star and Garter / Re: 1957 Super Rocket
« on: 08 March, 2017, 17:52:55 »
Thats right it is on the home page, test was published in Cycle magazine in September 1957. This is straight from the magazine.

The Star and Garter / 1957 Super Rocket
« on: 07 March, 2017, 19:04:38 »
Has anyone got one or actually seen the 1957 export only Super Rocket?

A photo would be interesting.

They came out in Spring 1957 as as far as I know were only exported mainly to the USA.

Photo from 1957 East Coast US brochure.

The second photo is reverse of service sheet 39 from August 1957 refers to R/Rocket with modified head from engine CA10R 4501 - CA10R 5000 and Super Rocket from engine CA10R 4650 and fitted in EA7 frame.

Twins / Re: Engine numbers
« on: 06 March, 2017, 16:01:06 »
This is the parts book photo I missed off

Twins / Re: Engine numbers
« on: 06 March, 2017, 12:57:46 »
Unfortunately the numbers Bacon gives for 1969 are not correct. The letters are OK. The numbers did not start at 101, they ran on from the 1968 numbers, starting around number 11101 and ending around 23000.

There were about 12000 A series twins made in the 1969 season August 1968 - July 1969, the last ones with date code GC for June 1969.

Photo is from front of 1969 parts book which shows start engine numbers.

Twins / Re: A10 SRM Five gear custer
« on: 06 March, 2017, 12:15:32 »
The kickstart ratchet, its bush on mainshaft and quadrant do wear sometime to extreme. Only examination will tell.

The sprocket can be changed with box left in frame just need to lock it to undo the old nut and do up the new one with oil seal. That takes a 1 1/2 inch AF spanner. The only thing you cannot really do with box shell in frame is to replace the main bearing and layshaft end bearing.

Replace the existing oil seal whilst sprocket off. The current prodution ones dont fit exactly they are a fraction too large in diameter (about 0.5 mm) to fit snuggly in the bearing recess and you may have to gently ease it so it fits properly.

Twins / Re: Engine numbers
« on: 06 March, 2017, 09:33:56 »

Your engine is an A65 Rocket from the late part of the 1965 season (August 1964 - July 1965). See below from Glass's Motorcycle check book, which puts the last engine number for the Rocket at A65B 436.

The versions equiped with the optional tachometer had engines starting A65C.

As it came from Denmark it was possibly imported there by Hansens of Copenhagen.

Also added a brochure photo of the Rocket from the 1965 BSA export catalogue.

Twins / Re: Engine numbers
« on: 06 March, 2017, 08:51:43 »
Its the seasons which can confuse. The service sheet not too well worded.

1969 season ran August 1968 til July 1969.

C means 1969 season so NC is October of 1969 season or October 1968.

Twins / Re: Engine numbers
« on: 05 March, 2017, 20:47:04 »

 The 1969 season engines started in August 1968  with  old number system numbers, but from September 1968 the new system was introduced.

Your first engine will be early 1969 season - probably August/September 1968.

Your engine with NC  is also 1969 season and decodes N for October and C for 1969 season so October 1968.

Twins / Re: A50 Carb
« on: 04 March, 2017, 15:29:32 »

The concentric came out in 1966 and BSA fitted them to some 1967 season bikes such as C25 and A65 Spitfire Mark 3. The A50 got one for the 1968 season.

Your 1963 A50 would have been fitted with a 1 inch bore monobloc 376/382 according to ther 1962-64 Amal settings list. With 250 main jet 3 1/2 slide needle in position 3, 106 needle jet and 25 pilot. It would also have had the interesting tickler arrangement due to the carb being shrouded by the side panel.

It is not unusual to find concentrics fitted in place of monoblocs.

The Star and Garter / Re: Replcement engine
« on: 04 March, 2017, 13:26:42 »
Does the engine number end with a "Y"?

Some A65LA and A65TA (1967) engines are "1970". But they dont have the normal month and year dating letters you would expect from 1969 on  engine numbers.

See the USA Service Bulletin below.

It is also worth going to BSAOC website, under "machine dating", then "engine and frame number introduction" where here is information which may assist. Basically some 1967 machines were not sold in that season and were refurbished and sold in 1969 and 1970 season.

Twins / Re: A65 Oil pump diffences
« on: 03 March, 2017, 17:42:14 »
When my A10 was converted by SRM some years ago the pump came back with such a countersink added.

The cast iron OIF pumps were ground in that area to seat the ball,

Twins / Re: A65 Oil pump diffences
« on: 03 March, 2017, 17:15:55 »
The countersunk hole is mentioned in the A65 workshop manuals.

Parts service bulletin G39 from February 1967 shows an improved A65 pump, amongst the changes was that the A10 body 67 1382 used until then (which was not countersunk) was changed to a new part 68- 934. Could be that the countersink was added at this time.

One of the A65 blue top service sheets recommends that the ball is seated to a new alloy pump by tapping ball to pump with a copper hammer.

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