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Messages - STAR TWIN

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I gather the club will be there. I'll be there on the VMCC stand with my Star Twin as well.

The Star and Garter / Re: tax discs
« on: 25 February, 2017, 06:55:15 »
I've been really boring and bought some reproduction tax discs for when the bikes were first registered. I can remember when it wasn't that uncommon to see Guinness beer labels where there should have been a legitimate tax disc. Now that would be a proper period accessory. 

Twins / Re: Non-branded supermarket petrols
« on: 24 February, 2017, 14:38:59 »
The problem with ethanol in petrol is that it is hygroscopic. With moisture in the air being absorbed, you can end up with an ethanol/water mix lurking in the bottom of your petrol tank and hence corrosion. You certainly notice this in older Japanese bikes with tanks made from fairly thin steel. The sudden rise in new petrol tanks available from India gives a hint that this is affecting our old bikes too. As an aside, speaking to a heating engineer, I was told that nowadays 90% of his callouts are due to water contamination in heating oil. All started when ethanol started to be added...

Twins / Re: Non-branded supermarket petrols
« on: 23 February, 2017, 15:07:26 »
Supermarket fuel is generally considered to have a higher ethanol content than forecourt fuel and, due to the price war, a reduced amount of the additives that counter the effects of ethanol. Morrisons by word of mouth has a particularly poor reputation. Our local car repair business makes a strong point of warning customers off supermarket fuel.
One thing to bear in mind is that octane ratings are not measured in the same manner as they were when out bikes were new. You can as an approximation knock off a few points. So current 98 octane is about the same as the old 95 octane.
If you must use supermarket fuel, be kind to your carb and shut off the petrol before you stop and let the engine run out of fuel. That way should avoid the insidious corrosion caused by fuel/ethanol/water lurking therein. A splash of 2 stroke oil in the petrol won't do any harm.     

The Star and Garter / Re: Light bulbs
« on: 23 February, 2017, 14:58:53 »
I can recommend the stop/tail LED bulbs. I got mine from classic dynamos. I'm not too keen on the light from instrument LEDs. Not the warm glow that you get from conventional bulbs. One small advantage of incandescent bulbs in your precious chronometric instruments is that they do help keep them warm and dry. No bad thing for those of us who ride our bikes in the rain. The LED headlight bulbs are useless after dark. The beam pattern is dismal. Quite good daytime running lights though.

Singles / Re: C15 ss Max speed
« on: 21 February, 2017, 14:19:14 »
10:1! Not a good idea in a C15. Or anything these days. Consider fitting a standard piston before something catastrophic occurs.

Twins / Re: A65 Piston advice
« on: 20 February, 2017, 14:51:00 »
Advice I received from a very reputable engine builder is don't go above 7.5:1 for normal road use and current rather dismal petrol. With any engine I build now, I go for the lowest available compression ratio pistons. Modern petrol has a considerably lower octane ratio than was available when our bikes were new. You may be OK with a higher compression ratio if you always use premium petrol. However it isn't always available. You try getting some North or West of Perth for instance. I take it everyone uses premium petrol in their BSAs. If not, why not?

Singles / Re: Oil Pipe Sizes
« on: 20 February, 2017, 06:25:05 »
Or even Halfords. I asked for 5/16" oil pipe. Sorry, we only do metric he said. OK, how about 8mm oil pipe says I. And so the assistant produced it - and it has marked all along its length it 5/16" oil pipe. 

« on: 19 February, 2017, 22:25:43 »
Watchmakers have 2 preferred lubricants. Whale oil and the grease from the side of your nose. If you ever see a watchmaker assembling a mechanism, spot the casual wipe of a spindle against his nose. Seriously. Generally speaking, brass components will not require lubrication.

Twins / Re: Colour code BSA Goldstar
« on: 19 February, 2017, 14:56:04 »
I've heard Ford Silver Fox mentioned.

Twins / Re: spark plugs
« on: 18 February, 2017, 17:58:46 »
If the plugs are black, they will be tracking to earth rather than sparking. It also implies running too rich - choke kept shut?

Twins / Re: spark plugs
« on: 18 February, 2017, 14:58:46 »
Something odd going on if plugs are actually burning out. Are the electrodes melting? My '51 Star Twin has run happily for many years on NGK B7HS plugs and bog standard carb settings.
You do have to be careful to avoid counterfeit plugs - if they are too cheap to be true, they are indeed too cheap to be true.
What colour are your plugs? White means running too weak.

Twins / Re: Oil Level
« on: 18 February, 2017, 06:37:28 »
I keep adding oil until when I kick it over I get oil on my finger from the top run of the primary chain. Make sure you press the kill button when kicking it over. Safety first kids!

Twins / Re: Lubricants
« on: 16 February, 2017, 07:59:58 »
B31 is on Castrol XXL (straight 40) 'cos I 've got gallons of the stuff. The A7 is also currently on XXL but is usually on Morris's 20-50. The A10 is on Morris's 20-50.
Really it's a question of good quality monograde oil or good quality multigrade. My general rule of thumb is monograde for roller bearing big ends, multigrade for plain big ends.
There is massive discussion elsewhere on the levels of ZDDP additive in classic oils against the reduced levels in current oils which have to avoid contaminating exhaust catalysts.
The bottom line is that any reputable oil changed reasonably regularly will do the job. 

The Star and Garter / Re: New BSA Website
« on: 13 February, 2017, 06:32:18 »
Very interesting site! I have an ex-Army B40 currently in the queue following a badly botched repair by my son... Slightly mixed feelings about ex-RAFP machines, having been in the RAF myself and had the odd run-in with the snowdrops.

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