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Messages - STAR TWIN

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Twins / Re: BTH magneto fitted to my A10
« on: 08 August, 2017, 22:20:44 »
And yet and yet... My BSAs have had excellent service and continue to do so from their K2Fs. Both were rebuilt over 30 years ago and are going strong. I'm off for a 300+ mile trip on the A10 tomorrow with a ferry to catch. Wouldn't do that if I didn't have confidence in the magneto - or the rest of the bike.

Singles / Re: B31 Cush Drive Nut
« on: 23 July, 2017, 22:28:06 »
I don't think a hot air gun will be up to the  task. You may need a propane/butane gas torch and get the nut good and hot. If it's hot enough for oil to sizzle out of the threads a good clout with a hammer and a drift should shift it.

Singles / Re: Compression Test
« on: 23 July, 2017, 14:09:42 »
Simplifying... Atmospheric pressure is approx 14.7 psi. So 8:1 compression gives 14.7 x 8 = 117.6 psi. However, the inlet valve closes after bdc so you have to reduce that by a factor depending on the cam. For rule of thumb, the expected reading would be approx 90% lower. so 117.6 x 90% = 106 psi. All assuming perfect ring and valve sealing. Pretty close to what you have recorded.   

Twins / Re: Exhaust pipes
« on: 15 July, 2017, 06:23:59 »
With a normal setup I don't think it will make any difference. For information on optimal exhaust lengths, read Tuning for Speed. Only applies to unsilenced exhausts though. For the curious, a Velocette goes better with a fishtail silencer than without.

Singles / Re: Trial run
« on: 13 July, 2017, 16:56:00 »
Backfiring on the over-run when hot is frequently air getting into the exhaust where the pipe enters the cylinder head. Exhaust paste or even RTV should sort it.

Twins / Re: air/choke worth fitting on concentric carbs?
« on: 12 July, 2017, 20:24:57 »
Fit chokes. They are there for a reason. If your A10 never needs a choke to start, you are probably running a bit rich on pilot jet and/or cutaway.

The Star and Garter / Re: Correct number plate format
« on: 04 July, 2017, 18:05:03 »
Might be worth checking with the DVLA database to be sure you are not cloning an existing vehicle. You might be safer with BSA 650 J as mentioned in my first post. Correct format but also instructive to the casual onlooker.

The Star and Garter / Re: Correct number plate format
« on: 04 July, 2017, 06:46:06 »
From fading memory BSA 650 J should be about right for Jul 71.

Singles / Re: Number Plates
« on: 01 July, 2017, 13:50:10 »
I have always used stick-on numbers. Mine are cut from reflective tape and do show up brilliantly in headlights. As far as I understand, out old bikes run under grandfather rights. Only more modern vehicles require very specific types of number plate. You see veterans with painted numerics and they are certainly legal - there was no alternative when they were built.

Twins / Re: Newbie first classic advise
« on: 30 June, 2017, 06:47:03 »
Take someone who knows classic bikes with you.

Twins / Re: Identify engine casing
« on: 18 June, 2017, 13:44:13 »
It looks very non-standard. A suitable rubber grommet might keep the mank out.

Singles / Re: B33 petrol tank
« on: 03 June, 2017, 10:27:55 »
It was often said that you should do all your maintenance with the tools in your bike toolkit. Very true. Fitted a new tube to the front wheel of my Star Twin yesterday and discovered that the bike toolkit was lacking a tommy bar. These things are best noticed in the comfort of your shed rather than in the middle of nowhere.

Twins / Re: A7ST Tank leaks - weld or liner repair kit?
« on: 03 June, 2017, 10:24:17 »
Had precisely one year from a small fibre patch to my Velo tank. I assume your tractor is diesel? One fried decided to line his new Indian made tank for his Ariel recently. Bought what he thought was the best sealant. 2 weeks later there were lumps of sealant floating around in the petrol.

Twins / Re: A7ST Tank leaks - weld or liner repair kit?
« on: 02 June, 2017, 21:31:14 »
Check carefully which kit you choose. On other fora there are tales of freshly lined tanks failing, the lining coming off or turning to sludge. I had a leaky seam on my Velo tank which I repaired successfully with solder after the previous owner's attempt to line it failed.
Incidentally, I too have a leaky Star Twin tank - can't find the precise point it is leaking - but my bike is currently sporting a Gold Flash tank suitably painted. I like the 4 1/4 gallon capacity.

The Star and Garter / Re: MOT
« on: 26 May, 2017, 19:02:33 »
I do believe you no longer need the MoT for a pre 1960 machine. A few years ago I had to MoT my 1913 Douglas. The tester was bemused.

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