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Messages - Jackson

Pages: [1] 2
1
Twins / Re: Useful A10 valve info.
« on: 22 January, 2018, 18:42:58 »
I'm hoping so, but I've been told that it applies to older valves as well, due to the behaviour of Austenitic steel at high temp (not something I know about though).

2
Twins / Useful A10 valve info.
« on: 22 January, 2018, 15:25:32 »
You may all know about this already, but in case you didnít.
Iíve just bought new inlet and exhaust valves (53 plunger A10) and they appear to be the same size and arenít marked in any way☹️
Just found out how to tell them apart. The exhaust valves are Austenitic steel and non magnetic. The inlet valves are magnetic. Saved me a lot of trouble.

3
Twins / Re: A10 Pistons again
« on: 04 January, 2018, 22:51:46 »
Thanks very much both.
Iíve just checked and the pistons supplied by SRM are the IMD ones referred to above.
They look like a good choice.
IMD also produce liners but Iím not sure if they are lipped, most donít seem to be, but Iíll find out.
Regards and thanks again.
Adrian

4
Twins / A10 Pistons again
« on: 04 January, 2018, 16:30:28 »
Sadly, I can't get away with using my existing (+060") pistons and now have to reline the barrels and get new pistons for my '53 Flash.
I realise that the lowest compression I can get is 7.25:1, but these mostly seem to be new Hepolite which I hear bad reports of (or at least the rings).
IMD are available complete with new liners, they say they are 5g lighter than the original, won't this mean I have to rebalance the crankshaft?
I would value any thoughts on good pistons and where to get them.
Thanks in advance,
 Adrian

5
Twins / Re: 1971 OIF Fork Oil.
« on: 28 November, 2017, 23:02:49 »
According to Roy Bacon  - Restoring BSA Twins page 212, 190cc.

6
Twins / Clutch Centre Nut
« on: 16 November, 2017, 16:26:28 »
I am having real problems removing the clutch centre nut on a 53 plunger A10.
Am I doing anything stupid? Iíve bent the tab washer back.
Itís not a left hand thread is it?
Adrian.

7
Twins / Re: A65 cylinder liners
« on: 13 November, 2017, 14:08:53 »
Iím looking for some for an A10 and noticed that Burton Bike Bits have some A65 liners.

8
Twins / Re: Lucas 169SA Handlebar Light Switches
« on: 11 November, 2017, 17:27:40 »
Sounds good! Iíll be doing this when the time comes. Still dismantling the engine looks l8ke a new liner at least.

9
Sidecars / Re: A bit in the side
« on: 06 November, 2017, 15:03:29 »
An absolute beauty.

10
Twins / Re: A10 Pistons
« on: 01 November, 2017, 15:47:52 »
Thatís really useful.
Thanks both of you.
It looks like itís been rebuilt fairly recently. So if thereís  no wear in the barrel and the pistons are OK Iíll reuse them with new rings.
Iím just feeling the need to check everything in the engine is OK as the front wheel wasnít and the carburettor was in a poor state.

11
Twins / A10 Pistons
« on: 01 November, 2017, 14:38:26 »
Looking around the web, the lowest compression pistons I can find for the A10 (53 plunger) are 7.25:1. I believe the correct pistons for a GF are 6.5:1.
Does anyone have any comments about the advisability of using the higher compression pistons? They are flat, the lower compression ones are dished.
Any thoughts would be valued.
Adrian

12
Twins / Re: A7 ST petrol tank - best options to flush
« on: 23 September, 2017, 18:03:44 »
It's yellow Loctite 577 for thread sealing. Just used some. Will leak test next week.

13
Twins / Re: A7 ST petrol tank - best options to flush
« on: 19 September, 2017, 22:30:38 »
Yes, these are the different strengths, but I think that there is another one for sealing rather than holding threads. I've checked the loctite site and they have, I think, purple for this purpose but I'm not sure about its petrol/ethanol resistant properties.
Adrian.

14
Twins / Re: A7 ST petrol tank - best options to flush
« on: 18 September, 2017, 21:31:15 »
I'm about to use paraffin. Recommended by a friend. It should also leak test it. I need to put taps in first though  :) I saw a recommendation for a Loctite thread sealant but can't remember where. Any suggestions?

15
Twins / Re: A10 Exhausts
« on: 20 August, 2017, 23:56:35 »
Just  bought siamese plunger A10 exhausts from Armours. They didn't have chrome and have been having problems after a fire at their suppliers. To cut a long story short, their service was exemplary. They held a stainless set for me for months until it was evident that the chrome set weren't  going to appear. I ordered the stainless pipes and they supplied them at the cost of the chrome set. I'm hoping not to exhausts for a while, but when I do they will be my first port of call.

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