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Messages - Bess

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Twins / Re: A65 - O rings
« on: 05 March, 2017, 10:56:21 »
Hi Arthur,
               The cases are the later design 1969 - 1972, I have not had them specifically dated as yet.

Best wishes.....

Twins / Re: A65 - O rings
« on: 04 March, 2017, 16:58:25 »
Thanks Arthur,
                        I was hoping to get the sizes and buy Viton rings to ensure quality.

I am building a couple of bikes from bits and pieces and have a A50, they are a mixture of years so I am compiling a reference manual for each of my bikes for the future.

Best wishes...

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 / Re: A65 Oil pump differences
« on: 04 March, 2017, 11:11:27 »
Thanks TTJOHN,

After reading the replies (thanks all) I decided to counterbore the pump. I then silver soldered a 1/4 ball on a mandrel and lapped in.

Twins / Re: A65 Oil pump differences
« on: 03 March, 2017, 17:20:44 »
Thanks guys.

It all makes sense however the earlier pump (60's) has the counterbore, the 70's pump does not.

Twins / Re: A65 Oil pump diffences
« on: 03 March, 2017, 16:42:19 »
Sorry, when I wrote older I ment the 70's pump....

Twins / Re: A65 Oil pump diffences
« on: 03 March, 2017, 16:38:46 »
Thanks TTJOHN.

I am not to sure about the O ring as its not listed on any parts list. Interestingly it's the older pump that has the counterbore, not the 70's possibly OIF model which has the bulkier castings around the stud holes. :(

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.

The Star and Garter / Re: TRike
« on: 03 March, 2017, 11:36:04 »
Hi Mike,
              I agree, I suggest you start today or you might forget what you were contemplating.... ;)

Twins / Re: A65 Side Stand
« on: 01 March, 2017, 19:29:20 »
Sorry just noticed it is out of stock

Twins / Re: A65 Piston advice
« on: 01 March, 2017, 15:08:09 »
They recommended the pistons they use on their rebuilds.

Inside of the piston casting is the name AERCO, the rings are stamped AE and on the box "BSA piston and genuine Hepolite made in England piston".

Found this on the web

 Best wishes...

Twins / Re: A65 Piston advice
« on: 01 March, 2017, 10:03:40 »
Thanks for the info guys. Went with what SRM recommended in the end....

Singles / Re: Rectifier
« on: 01 March, 2017, 10:00:24 »
Your welcome, hope all goes well....

Singles / Re: Rectifier
« on: 28 February, 2017, 17:23:22 »
    As the connection from the alternator is ac, connecting either way is okay.

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