The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: coater87 on 21.07. 2017 05:36
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These are the numbers on a swing arm motor. Whether A7 or A10 I have no idea.
Any thoughts ?
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I suspect the short answer is not the original number stamping.
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Looks dodgy *dunno*
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Looks strange, but I guess the long figures are a Date 19658 can mean August 65.
But whats about the crank inside *dunno*A7 had a shorter strocke than A10
Never seen befor is the prefix Z.
I had a crankcase stamped DA7 , asking the BSAOC, this combination never left the faktory, but the figures looks like original punshes.
Maybe a Monday engine *eek*
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I remember reading an article about a gold star stamped with a BC prefix ( a humble c10 or c11 prefix ) straight from BSAS . Suppose the chap just picked up the stamps in the wrong sequence .
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The case looks polished. I think an original number has been ground off and this one stamped on.
ZA7 3 does not exist as an original prefix and the stamper might have meant ZA7S forStar twin.
ZA7 was an early long stroke prefix. The inside of the crankcase should give a clue whether long stroke or not.
ZA7S and ZA7 numbers did not reach 19653.
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...ZA7 was an early long stroke prefix. The inside of the crankcase should give a clue whether long stroke or not...
To save some work, the timing cover shape(and a few other views) would do the same *????*
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Coater87 said swing arm engine.
Should be CA7, CA10 or later for a swing arm engine. Sorry to be the bearer of bad news but I agree with JulianS, cases have been polished and IMHO the stamps don't look factory. It doesn't matter if you have a receipt for it and the registration department in your country don't have these numbers on their computer, they don't know what the numbers should look like. But, don't go near a concourse competition. *eek*
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I do not own this, it's for sale.
I asked the guy to send me pictures of the motor numbers. This is what I got from him.
I explained the numbers were bad, it's not a rocket gold star super ultra rocket motor. Then I explained it may not even be an A10 motor, but an A7.
I think I ***** him off, which is too bad because the crankshaft may be a good one. But who knows without tearing into it. *dunno*
Lee
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..... which is too bad because the crankshaft may be a good one. ...
Maybe best pretend it's not a good'un for peace of mind *dunno*...... or go hard and live dangerous *work* *fight* *beer*
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..... which is too bad because the crankshaft may be a good one. ...
Maybe best pretend it's not a good'un for peace of mind *dunno*...... or go hard and live dangerous *work* *fight* *beer*
He is up near 800.00 U.S. for this really rare, one off, Super Ultra Rocket Gold Star motor.
Taking a chance is one thing, wiping my butt with a wad of money is another. *eek* *smile*
Someone WILL buy this though, next month it will be on EBAY for 1500.00....
Lee
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I hope the eventual purchaser will be wearing oven gloves 'cos it looks red hot to me.
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Hi All,
Lee,
On any BSA crankcases A and B series I have looked at there is a date stamp,(in UK format) usually inside the timing case or outside on the case more or less under the magneto
Definitely a re stamped number
Are there any more pics on the ad?
Go on give us a laugh *smile* at $800 he will be looking at it forever ??
John