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What's this from

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What's this from

Post  kerabo on Sun Nov 19, 2017 2:19 pm

Can anyone tell me what Villiers engine number 340B was from. It seems the decompressor porting when aligned means the head is on sideways ?
My thoughts were a Bond but can't find anything to prove it.

Ken
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Villiers 31A engine

Post  FB vincent on Sun Nov 19, 2017 3:44 pm

From 'Villiers - Everybody's Engine' by Carrick and Walker 340B prefix is for a 31A engine from a Greeves. I am sure the Greeves Riders Association forum will be able to confirm the exact Greeves model.

Sandy

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Engine

Post  kerabo on Sun Nov 19, 2017 3:46 pm

Yes someone else said that but it's not 9E based its like an 8E or smaller.
Regards Ken
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Engine number

Post  Bigjim on Mon Nov 20, 2017 11:04 pm

Don't forget that the factory used an alloy plate, which is easy to swap. Or even swap the inner chain case. Plenty of bikes their primary chain, thus damaging the covers. A quick trip to the scrap yard, and another set of cases were sourced.
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Re what's this

Post  kerabo on Tue Nov 21, 2017 8:21 am

What started this post was that the chap had an engine with a decompressor but to fit it the head had to be sideways or the vents don't align. My thoughts was a bond that could gave had cowls and a fan.
I was unable to trace the stamped number as I belive this would say where it started out.

Thanks Ken
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Numbers

Post  john87 on Tue Nov 21, 2017 10:09 am


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Re: What's this from

Post  John Wakefield on Thu Nov 23, 2017 5:55 pm

FB vincent wrote:From 'Villiers - Everybody's Engine' by Carrick and Walker 340B prefix is for a 31A engine from a Greeves. I am sure the Greeves Riders Association forum will be able to confirm the exact Greeves model.

Sandy

The 31A engine with 340B prefix was fitted to a Greeves 24TAS trials bike

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31A/340B

Post  piston 197 on Thu Nov 23, 2017 6:09 pm

I agree with the info above that a 340B is a number from a 31A Greeves, but as Ken said above the engine is of the earlier 8E design , not 9E design, so cannot be a 31A ???
The engine No. if it is 8E based will be a stamping on the front engine mount rather than an aluminium tag, so cannot be changed by swapping clutch cases ??,
It is possible the head has come from a fan cooled engine hence why when aligning the decompressor drilling the fins run left/right rather than front/back ??

Still does not explain how a 340B stamping is on a non 31A engine ??

JH
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Engine

Post  kerabo on Thu Nov 23, 2017 9:03 pm

This is the engine
Must be getting good I managed to download a picture. I know the heads straight but to align the port for the decompressor it goes sideways .
You can't see the 340B but it's on the top flange

Ken




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Decompressor

Post  piston 197 on Fri Nov 24, 2017 7:13 am

Well it is not a fan cooled head, so there goes another theory ? and DEFINITLEY not a 31A !
Normally the drilling for the decompressor is between the front 2 head bolts and goes vertically down to the exhaust port.
The decompressor in the head is usually on the l/hand side ( can't see it in the pictures, so assume this is where it is ?) there is then an angled drilling in the head which forms a path from the decompressor in the head to the vertical hole in the barrel. It is worth taking the head off and looking just in case the owner thinks the decompressor has to be above the barrel drilling rather than at 90 degrees to it ?
I would like to see a picture of the underside of the head and of the top of the barrel surface, as everything in the pictures looks to be correct ??
JH
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Engine

Post  kerabo on Fri Nov 24, 2017 7:40 am

A few more pictures.
What he says is when the holes for the decompressor are aligned he head is sideways.






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Decompressor

Post  piston 197 on Fri Nov 24, 2017 7:52 am

And looking at those photos he is absolutely correct ?? even the bulge in the mating face of the head is 90 degrees out from where it should be. The guy is right, this is some strange head ?? the barrel is correct and standard as you would expect. So it seems to be for an application where the head was designed to sit sideways on the barrel , possibly micro car or similar, but it does not have the normal flat finning of a fan cooled head.

As Toyah Wilcox said " it's a mystery", ( or in Toyah's case "itth tha mythtery") never seen this before , and i have seen a lot of villiers heads in my time !
JH
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More observations

Post  piston 197 on Fri Nov 24, 2017 7:59 am

And looking at the photo of the James, the rear wheel hub is from a BSA Bantam ( or Triumph Tiger cub ,same wheel)
JH
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Engine

Post  kerabo on Fri Nov 24, 2017 8:30 am

He also said he inherited this from his dad and when I said bond he did say his dad had one so could have been

Thanks Ken
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Re: What's this from

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