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Topics - Bess

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Which BSA do you ride? / Triplets are growing..
« on: 15 June, 2017, 10:39:19 »
    A50 in the background needing a some minor surgery, the 2 A65's getting there slowly....

The Star and Garter / Re: Chrome
« on: 08 May, 2017, 09:52:08 »
Hi All,
         Can anyone recommend a chroming works in the Devon area?


Twins / Re: A65 air filters
« on: 21 April, 2017, 10:03:46 »
Hi All,
    Has anyone had experience of these air filters:

I'm considering using them on a Lightning and Thunderbolt, the bikes will have side covers and generally standard around the filter area. Is there any issues I should be aware of?


The Star and Garter / Re: London Today
« on: 22 March, 2017, 18:43:27 »
Hi All,
         I hope nobody was personally affected by the events today in London, my thoughts are with the victims. Does the club support in any way?

Twins / A65 - Front wheel spindle
« on: 19 March, 2017, 10:48:28 »
     Does anyone know the differences between the following spindles:

* 1968 part number 37-2057
* 1969-1970 part number 37-1641

I have put together forks, brake etc as per the 1968 TLS but the lug on the fork that fits into the TLS plate only enters partway. My thinking is that changing the spindle is the best option but I don't want to spend the cash if I'm barking up the wrong tree.

Best wishes...

Twins / A65 Lightning carburettors
« on: 08 March, 2017, 12:58:11 »
Hi all,
         I am the point where I need to buy carbs. Machine 1, is Oct 1968, 9:1 pistons with a  twin carb head. The other is Aug/Sept 1968  single carb head with 9:1 pistons (Thanks JulianJ for dating). Both heads have 1.598 inlet and 1.410 exhaust valve diameters.

I have looked at the manuals and services sheets and I not sure which would be the best carbs to buy, jets and settings I should adopt as I am sure I haven't got all the information. I am also aware that as time went on BSA improved fuel delivery.

Any spark plug advice would aslo be appreciated.

Best wishes.....

Twins / A65 - Engine spacers
« on: 06 March, 2017, 16:35:07 »

Could anyone let me have the dimensions of the following engine spacers:

68-0686 and 68-687


Twins / A65 - O rings
« on: 04 March, 2017, 14:41:06 »
Hi All,

Does anyone have or know where I can get a list of all o rings sizes for the engine?


Twins / A65 Oil pump diffences
« on: 03 March, 2017, 16:17:52 »

I putting together a couple of A65's and have checked assembled 2 oil pumps. A 1960's the other 1970's, the 60's pump has a counterbore in the non return valve ball location.

Please see attachment

My research has found the valve spring is the same for all years so I guess the counterbore has little effect on the pump function.

Is there anything I need to be aware of due to this difference?

Thanks for looking.

Twins / A65 Piston advice
« on: 19 February, 2017, 18:15:01 »
I'm at a point where I need to buy new pistons for our latest A65 projects, I have a Lightning my son a Thunderbolt. I have read plenty of horror stories of what to and what not to buy. What make should I buy and would fitting 7:1 ratios be a better option for less vibration etc. ?

Which BSA do you ride? / A50
« on: 12 February, 2017, 18:32:12 »
Put this together as a all-rounder to ride in any weather, hence the extensive use of aluminium and stainless fittings and fixtures.

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