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Messages - STAR TWIN

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121
The Star and Garter / Re: 1957 Super Rocket
« on: 08 March, 2017, 06:43:42 »
No but I do like the pedestrian emasculator on the front mudguard on the brochure.

122
Twins / Re: A10 SRM Five gear custer
« on: 07 March, 2017, 14:21:07 »
The STD swinging arm BSA box has a bit of a gap between 2nd and 3rd gear. However, the A10 engine is sufficiently flexible and torquey that you really don't notice it. Try the normal 4 speed first before going to the expense of a 5 speed cluster.

123
Twins / Re: A65 Piston advice
« on: 01 March, 2017, 14:23:54 »
Would be interested to know what SRM recommended.

124
The Star and Garter / Re: Spark plugs
« on: 28 February, 2017, 06:23:29 »
There are plenty of equivalents out there. I use NGK B7ES.

125
Twins / Re: Non-branded supermarket petrols
« on: 25 February, 2017, 17:52:33 »
A65s have alloy heads with valve seat inserts which are hard enough to cope with unleaded petrol, so no worries there. There were lots of scare stories about valve seat recession in cast iron heads but actual cases are relatively uncommon. I've had no problems with my iron-headed B31, A7 and Land Rovers.

126
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. 

127
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...

128
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.     

129
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.

130
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.

131
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?

132
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. 

133
Twins / Re: SMITHS CHRONOMETRIC SPEEDOMETER - LUBRICATION.
« 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.

134
Twins / Re: Colour code BSA Goldstar
« on: 19 February, 2017, 14:56:04 »
I've heard Ford Silver Fox mentioned.

135
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?

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