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Messages - JulianS

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Twins / Re: Super Rocket ignition timing
« on: 14 June, 2018, 20:51:05 »
A degree disc will give more accurate timing.

Expect some variation between the cylinders.

If you have timed it on the more retarded cylinder then the other could be too far advance and causing the problem.

Singles / Re: 7" tls brake
« on: 14 June, 2018, 19:44:40 »
The TLS brake is a very good one I certainly would not alter any of the operating levers.

When you ride it you will see what I mean about the action and feel of it.

Twins / Re: A65 stainless steel nuts & bolts
« on: 14 June, 2018, 18:52:04 »
The parts book shows the thread sizes of a number of the fixings. It also shows the material specification of some of the fixings - those needing high tensile fittings.

The 1970 bikes had a mid season change from bolts to studs and nuts for the fork end caps. The service bulletin below shows the change.

Singles / Re: Any good pictures of Sapphire Blue (063) Bikes ?
« on: 14 June, 2018, 18:35:57 »
Sapphire blue was listed as an option in the 1965 catalogue.

However I dont think many if any were produced in it.

A lot of the 1965 B40 were exported and a lot were military spec bikes also for export.

I dont think it sold well in the UK domestic market.

If you want to be sure of the colour a dating certificate from the BSAOC will show its colour if it is shown in the despatch book.

Singles / Re: 7" tls brake
« on: 14 June, 2018, 16:30:08 »
You may need to make a cable to suit. Ready made ones seldom fit properly they need to be quite average and some new ones are poor quality.

The handle bar lever will often pull right back when at rest but in motion the shoes slide and give it a different feel.

Try it again when the bike is in use

Singles / Re: no spark at kick over
« on: 13 June, 2018, 20:47:13 »
I would check points condition and gap.

Also would try swapping the condenser, too much spark at points means dodgy condenser.

Singles / Re: C15 misfire
« on: 11 June, 2018, 22:26:40 »
Is it set too rich?

Is it flooding?

What does the plug look like?

Singles / Re: B26 pre OIF, oil hole mystery?
« on: 10 June, 2018, 17:06:17 »
You can check for wet sumping by removing the sump cover.

The oil which you may find between the inner and outer timing cover does not go to the gearbox, there is not oilway between them.

It is worth reading the most excellent book by Rupert Ratio - Unit Single engine manual. It explains the hole and very much more.

Twins / Re: Rotor nut torque setting?
« on: 10 June, 2018, 15:45:37 »
60 is the correct figure.

Below service sheet from May 1970.

Singles / Re: B26 pre OIF, oil hole mystery?
« on: 10 June, 2018, 15:23:03 »
The hole should be below the oil level in the sump.

Sump is not an oil resevoir and should not be very much there.

Singles / Re: B26 pre OIF, oil hole mystery?
« on: 10 June, 2018, 12:02:11 »
The little hole allows oil expelled from the breather to be readmitted to the crankcase.

Singles / Re: B40T swinging arm bushes...
« on: 10 June, 2018, 09:58:14 »
If your bushes are steel backed ( like used in the 1969/1970 A50 and A65) I would expect them to be pre sized because the bronze alloy is quite thin and would not really be suitable for reaming. The supplier should be able to advise if they are pre sized.

They need to be pressed in squarely then you can check the fit of the new pin.

If bushes are all bronze alloy they will more than likely need to be line reamed after pressing into swinging arm.

Below is an article from 1966 showing reaming the bushes.

Twins / Re: A 65 Rebores and re-sleeves
« on: 08 June, 2018, 18:19:54 »
Given the damage I would consider a Plan C - source an undamaged cylinder with a rebore left in it.

A few years ago I had my A10 linered with proper lipped liners, larger cutouts for billet rods, blasted and painted and one helicoil repair, with GPM pistons (did not want the cheap new hepolite). Cost including carriage was just under 700. SRM did it. A perfect job.

Liners usually need trimming around the base to match the cylinder, should be no problem to a decent engineer.

I would avoid non lipped liners which have been known to move.

Bantam / Re: Exhaust Sizes
« on: 08 June, 2018, 18:12:23 »
The large bore exhaust were on the D14 and B175 - 1 3/4 inch.

Small bore up to D10 - 1 3/8 inch.

Singles / Re: Clonk
« on: 08 June, 2018, 14:42:01 »
With the weight of a rider when in use they will not clonk as much, they will not get to full extension as easily as when unloaded.

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