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Messages - JulianS

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Twins / Re: A65 Lightning Clutch Retaining Nut
« on: 24 February, 2017, 20:58:24 »
The way I see it is that the 4 spring clutches up to 1965 had a plain nut and lock washer and the 1966 on 3 spring clutches had a lock nut.

The cross section below is from "Motor Cycle" 2 September 1965 when the new clutch was introduced for the 1966 season. You can see the orientation of the nut - but also note that it shows a lock washer.

The second photo is from the 1966-68 workshop manual and again shows the orientation of the nut but no lock washer.

The saw cuts show in both.

Twins / Re: A65 Lightning Clutch Retaining Nut
« on: 24 February, 2017, 19:26:36 »
The original nut would have been an all metal aerotight type lock nut. These nuts have saw cuts. If your bike is still fitted with such a nut then it will be clear if it still has any "lock" left in it.

I would suggest use of a Loctite thread locker to be certain.

These nuts had a torque setting of 65/70 ft lbs.

The nut 68 3300 was changed in 1967 for a simliar one with better material specification part 68 3320. This was covered in parts service bulletin G40 from February 1967 part of  which is in the photo.

Singles / Re: B31 tyre sizes for a 1958 bike.
« on: 24 February, 2017, 19:17:26 »
The B33 of the same year was fitted with a 3.50 x 19 rear tyre. As the wheels are the same the slightly wider tyre would suite your bike.

The Star and Garter / Re: Light bulbs
« on: 23 February, 2017, 17:54:07 »
Yes you need a 12 volt battery.

I use a YTX7L-BS in my 1962 A10. Fits well with the wire clip type battery fixing. Lots of different makes - Yuasa, Lucas etc

It is a sealed battery after the electrolyte has been added  so no vent or acid spillage.

Singles / Re: C15 ss Max speed
« on: 23 February, 2017, 16:55:09 »
A larger gearbox sprocket will not increase maximum speed unless the bike was undergeared for the power before the change. You will reduce the acceleration and possibly the top speed unless you reduce the weight of bike and rider significantly.

The blue top service sheet below from 1963 shows that the factory actually reduced the gearbox sprocket from 17 to 16 teeth on the SS80 and got a higher maximum speed.

Looking through the 1964 USA brochure that shows the standard gearbox sprocket as 16 teeth.

There were quite a number of engine gearbox and rear wheel sprocket variations available for the competition models some of which show in the second photo of a US bulletin.

The Star and Garter / Re: Light bulbs
« on: 23 February, 2017, 12:22:29 »
Look at Paul Goffs website for the bulbs.

Think about changing the speedo bulb for LED also because the originals can be vibration prone and fail.

If you put a halogen bulb in an original or repro British pre focus headlight  unit you will get a brighter light but the beam pattern will not improve.

Singles / Re: C15 ss Max speed
« on: 21 February, 2017, 10:04:08 »
I think you are expecting too much from an over 50 year old C15.

Not only the engine and cycle parts but also the build and weight of rider have significant effect on performance of a small bike.

The test bikes in the magazines were probably collected by the tester from the BSA factory and would in all probability been in top condition set up properly by factory staff.

The first photo shows an extract from the road test of a standard C15 from "Motorcycling" February 22 1960. You will see that the rider got 70 mph going down hill.

The second and third photos are an extract from the road test of a C15 SS80 from Motor Cycle June 1st 1961. You will note the tester comments about cruising on the M1.

Reading the tests I think that if you can get a reliable anytime top speed of 60 - 65 then it is not doing too bad.

Pre War / Re: Bsa magneto repair
« on: 21 February, 2017, 09:22:01 »
Yes it is a tight fit.

Presuming it is a ring cam magneto you need 2 slim well fitting 4 BA spanners such as "Terry" spanners or a set of magneto spanners (search E bay lots to be found there). Even then you might have to file off an edge of spanner to get best access.

The Star and Garter / Re: Handy hint
« on: 20 February, 2017, 19:06:11 »
This photo might help with the brake shoe plates. (someone turned the edge off the brake plate!)

Twins / Re: A65 Piston advice
« on: 20 February, 2017, 16:20:09 »
My alloy head A10 is on GPM 8.75:1 pistons. Goes fine on ordinary grade fuel no additives. Tried premium grade and it does not seem to make any difference. Have not tried supermarket petrol.

Tried it on 7.25;1 new hepolites and definate drop in power felt.

The new hepolite rings were very poor quality and had not bedded in over 1000 miles. Some dealers who sell the new hepolite pistons will not sell the new hepolite rings because of the poor quality, they fit Italian rings.

So next time I need pistons it will be either GPM or new old stock real Hepolites.

Iron head A10 pinked a lot on GPMs.

Pre War / Re: Bsa magneto repair
« on: 20 February, 2017, 10:13:13 »
If the Sloper mag with a ring cam takes the easycap as photo below.

Photo from A10 mag but same principal.

I have had excellent and quick magneto service from Andrew Guttmann at Priory Magnetos and also from Armoto in Chesterfield.

« on: 20 February, 2017, 10:00:37 »
If it is working OK I would avoid tampering. It is easy to upset the mechanism.

However  if you wish to service it there are a number of articles to be found on the internet which will give you some insight into the workings.

This link is one such;

Twins / Re: spark plugs
« on: 19 February, 2017, 19:52:50 »
An ohm meter is useful for testing the rsistor in a resistor type plug.

For non resistor plugs not  a useful test. Try it on a new plug and see what you get - probably open circuit.

The best test for a plug is by substitution they are cheap enough. It how they work in a hot engine under combustion pressure which matters.

Singles / Re: B33 rocker feed and return banjo bolts
« on: 19 February, 2017, 09:48:26 »
The rocker feed bolts have a very small hole like a pin hole. Both rockers had the same feed bolt. The 1949 parts book lists the bolts as 65 306 (Same for A7) but from 1953 the part number goes to 65 317. I dont know what the difference is between 65 306 and 65 317 but I suspect not much.

Bolt 65 318 has a larger hole and was fitted to the exhaust rocker of the Gold Star.

The drain bolt 26 1253 at head and crankcase would have a much larger hole to allow free draining  of oil from the rocker compartment.

26 1253Q is not a BSA number. Perhaps the supplier can explain?

For parts I would use one of the well established dealers. I get a lot from C and D Autos and find them very knowledgable and helpful if you phone them.

Photo from 1949 parts book.

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