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Messages - AWJDThumper

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Singles / Re: 1970 B25 Starfire tyres
« on: Today at 12:14:03 »
For the sort of riding you can do on a B25, I don't think it matters that much what tyres you use, and whether they are matched, as long as you've got a reasonable amount of tread on both. I ride a much higher performance single with semi off road tyres on it and have never experienced any problems with road holding even with these non ideal road tyres.

Singles / Re: Fuel petcock/fuel line
« on: 19 April, 2018, 20:28:38 »
I find the difference between US and Queen's English is relatively small especially when compared with the variations in English you get from working with our European Union colleagues ::)

Singles / Re: Fuel petcock/fuel line
« on: 19 April, 2018, 10:55:27 »
I'm presently posting from NYC and therefore adopting AMERICAN to respond:

Your carb should have a fuel banjo with two inlets, one from each petcock. If you go to the AMAL/BURLEN web site, it's probably a 5/16", 150 degree dual banjo that you need.

Singles / Re: Gear box drain plug
« on: 19 April, 2018, 10:44:00 »
It is 1/2" UNC - you need a 3/4" AF socket or spanner.

Twins / Re: A65 Gearbox Camplate
« on: 17 April, 2018, 11:10:39 »
The cam plate 57-2767 looks like an interim solution and was only used for late 1969 A65's. It was superseded by 57-4026 in 1970. I think the first link below may not be 57-2767 but may be the earlier stepped 68-3187 - it certainly looks identical to it. The link indicates 66-9 which supports this. The advert I've seen for an interim 57-2767 actually says it will not fit the earlier cam plate because it is too thick. I'm assuming this cam plate is more or less the same as the final version 57-4026 with perhaps a tweak to the selector slot design??

However, there does seem to be a lot of confusion over which cam plate is which because there is no part number stamped on any of them. Since late 1969 A65's are a small fraction of the total, the earlier and later models can be more or less distinguished by the width of the bearing plate slot and the corresponding thickness of the cam plate at that end: earlier 1/8" and later ones 3/16".

Twins / Re: A65 Gearbox Camplate
« on: 16 April, 2018, 23:46:04 »
I don't think it is entirely clear how the interim cam plate (57-2767) fitted with the earlier bearing plate design. From what I can tell, this cam plate was 3/16" thick and so wouldn't have fitted through the 1/8" slot in these earlier bearing plates unless the bearing plate for the late 1969 A65's was suitably modified; ie the slot was milled out to 3/16" width.

Twins / Re: A65 Gearbox Camplate
« on: 16 April, 2018, 19:37:47 »
No. The first two have a boss on the cam plate to fit a wider slot in the bearing plate, whereas, the later two don't have the boss but use a bearing plate with a 3/16" slot .

Twins / Re: A65 Gearbox Camplate
« on: 16 April, 2018, 17:27:38 »
I believe the history of the A65 cam plate was as follows:

1962-65 (68-3043): used a strap across the selector fork slots to strengthen it

1966-69 (68-3187): used a step for the selector slots to strengthen it

1969 (57-2767): interim thicker (3/16") cam plate throughout for strength

1970+ (57-4026): final thicker (3/16") cam plate throughout for strength

Twins / Re: A65 Gearbox Camplate
« on: 16 April, 2018, 12:59:00 »
I assume the purpose of the step is simply to provide a thicker and stronger bearing surface for the selector fork rollers. What is the actual width of the slot in the end cover? I believe the later cam plates were 3/16" thick at the bearing.

Twins / Re: Fork oil seals
« on: 16 April, 2018, 08:09:29 »
The external dimension specified for fork seal 65-5451 is 1.83" or 46.5mm so there appears to be nothing wrong with the new seals you have. In general, fork seals can be a very tight in the seal holders and ideally need a drift of the correct size to force them into position. I've certainly had seals which were very hard to insert. A bit of lubrication might help and, if all else fails, you can probably rub down the outside with a bit of emery paper to reduce their diameter.

Singles / Re: C15 starting difficulty
« on: 15 April, 2018, 18:46:12 »
The tickler is the cold starting device on the AMAL carb - a choke is there to make warming up the engine a little easier. Difficult starting could be due to a number of things but I'd start to cleaning out the carb and blowing though the passageways and the jets. From memory, I think the pilot air mixture screw should be screwed out about 1.5 turns as a starting point. In terms of initial starting, it is just the pilot jet and its air passageway that matter.

Singles / Re: Again with the gearchange splines alredy.
« on: 15 April, 2018, 18:37:32 »
I think the problem with the BSA gear change shaft is that they are not made from hardened steel and hence the splines are fairly easily damaged. This is in contrast to my slightly more modern bike's gear change shaft which is almost impossible to damage.

Singles / Re: oil tank union nut -oil seal to oil out hose
« on: 15 April, 2018, 17:32:31 »
It relies on the taper on the metal pipe mating with the opposite taper on the filter housing. As long as the tapers aren't damaged, it should seal ok.

Singles / Re: Sump Plate - loose studs & sealing
« on: 15 April, 2018, 17:26:38 »
Either use thread lock or lock two nuts on the end of the stud to enable you to screw the studs in tight into the crankcase. If you don't, they will just come loose again and eventually wear out the thread in the soft crankcase metal;.

Twins / Re: Battery cradle
« on: 15 April, 2018, 16:20:06 »
It's just for vibration isolation - the battery's not connected to the cradle electrically.

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