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Messages - STAR TWIN

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Singles / Re: BSA B33 sticky exhaust valve advise please
« on: 14 August, 2017, 22:42:03 »
I had a similar problem with a guide fitted to an iron head A7. What I did was to buy a set of engineers drill bits from Screwfix. I selected one that was a neat sliding fit in the valve guide. I then selected the next one up and carefully ran it through the guide. Problem solved.

The Star and Garter / Re: B31 Valve seats - lead free
« on: 14 August, 2017, 07:02:54 »
I run a B31, an A7 and various old iron-head Land Rovers. They all do just fine. I invariably use super unleaded petrol, but that's just to minimise the effect of ethanol.
When all this started, the SVVF (I think) commissioned tests on valve seat recession. None occurred below 3,500 rpm. Do you cruise your B31 well above this?
I would suggest putting any paranoia in a quiet corner and not disturbing it.

Which BSA do you ride? / Re: A7 Star Twin
« on: 11 August, 2017, 21:12:49 »
Glad you liked the picture Steve. These machines are used as ordinary transport and the longer distance the better. One son has made off with my copy Where BSAs Dare. If he's inspired, there will be a fight - the other son intends to inherit the Star Twin. Not 
 that I am in any rush to depart this mortal coil! Gordon.

Which BSA do you ride? / Re: A7 Star Twin
« on: 11 August, 2017, 10:23:58 »
And the Star Twin shares the shed with my wife's A10.

Twins / Re: BTH magneto fitted to my A10
« on: 10 August, 2017, 21:51:45 »
Proof of the pudding - or should that be K2F?

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.

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