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Messages - JulianS

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Singles / Re: C15 Forks
« on: 30 June, 2017, 14:36:04 »
Seals should be a good fit in the holders.

You could ask BBB about the seals supplied and the fit.

How does the outside diameter of the old ones compare with the new?

(according to my old Paynes seal lists the seal measures 31.7 mm inside diameter x 39.73 mm outside diameter x 3.9 mm deep - yes that is what it says with no Imperial measure given!!)

Depending on how lose the fit you might be able to wrap some PTFE tape around the outside of the seal but honestly you should not need to bodge with the correct parts.

Singles / Re: C15 Forks
« on: 30 June, 2017, 12:21:41 »
I think the forks are 1 1/4 diameter but it is easy enough to measure yours at the upper diameter.

Main thing is to make sure there is no damage/pitting/corrosion  to chew up the seals either in use or when putting the seal holder back on over the upper part of the leg.

Twins / Re: A65 alternator
« on: 29 June, 2017, 18:52:38 »
More likley to be single phase. 3 phase came in in the 1970s.

If the windings are open not encapsulated than its definately single phase.

Windings were encapsulated in resin from sometime during 1967.

If the windings are encapsulated and there are 2 output wire then  it is also single phase.

If the windings are encapsulated and there are 3 output wires and 6 poles visible on the stator when view from inside diameter it is also single phase.

If the windings are encapsulated and there are 3 output wires and 9 poles visible on the stator when view from inside diameter then it is 3 phase.

Twins / Re: Mag servicing
« on: 29 June, 2017, 09:33:47 »
I have have had very good service from Andrew Guttman at priory magnetos.

Twins / Re: Gearbox grub screw removal
« on: 27 June, 2017, 11:58:09 »
Yes you can - given a suitable screw driver and assuming that the grub screw is neither too tight or is damaged.

Photo shows one being removed from my A10, to replace it with an allen socket head one from Dave Flintoff Engineering.

Bantam / Re: Four stroking !
« on: 17 June, 2017, 09:05:19 »
Four stroking usually means too rich mixture.

The Star and Garter / Re: Richard Pawson
« on: 17 June, 2017, 09:01:46 »
It was always a pleasure to see and speak to Richard, such an easy going and engaging personality.

I will miss him. Gone too soon.

Singles / Re: B31 iol leak
« on: 16 June, 2017, 12:15:41 »
Check the castellated gland nut at top of pushrod tower is done up. If it is you probably need to replace the gland seal which sits above the nut next to the head. That means head off.

Singles / Re: B31 Primary drive
« on: 16 June, 2017, 10:19:14 »
Usual sprocket for B31 would be 17 teeth.

Is that damage recent - you would find traces of aluminium in the drained oil - or something historic?

Any shims behind the sprocket would be to align it with the clutch chainwheel.

The nut is normal right hand thread. There is (or should be) a lock washer under the nut. Usually nut very tight for obvious reasons and often tightened up with a hammer and drift. You may need to resort to this method especially if the nut is damaged.

Twins / Re: A7 engine age
« on: 16 June, 2017, 10:05:48 »
The engine is 1959 season.

You can date numbers on the BSAOC website under "machine dating" tab then "motorcycle year listing"

Singles / Re: New to world of B31s
« on: 15 June, 2017, 09:22:09 »
The pinion should tap onto the mag shaft just like your other bike so it suggests that the taper is worn or damaged.

As for the rich running  the carb could be wrongly assembled.

Check the joint between the float needle seating and carb body.

If the carb has a recess as the photo then it is a "new" type monobloc (which takes the thin cross section o ring) and there should be a fibre washer between body and seating.

If the body is flat no recess it is an old or original type monobloc (which takes the thick section o ring) and the joint should be metal to metal. Sometime a fibre washer is wrongly fitted in this joint. It raises the float level and can cause flooding and rich running.

Get a dating certificate from the BSAOC which will tell you the date the frame was despatched from the factory.

On BSAOC web site click on "machine dating" and follow the chart.

Singles / Re: C15 Max Speed
« on: 14 June, 2017, 09:01:16 »
Sorry I dont agree about weight.

Experiment by carrying a pillion passenger.

Twins / Re: Number stamped into front right engine casing?
« on: 13 June, 2017, 20:26:59 »
This might be the answer - page from 1969/70 workshop manual.

Singles / Re: BSA C15S identification
« on: 13 June, 2017, 17:54:38 »
The frame number is a standard C15 roadster number from 1964 season.

The engine number is a C15 scrambles number from the 1963 season.

Scrambles frames started C15C.

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