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identification

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identification

Post  piston 197 on Sat Nov 21, 2015 2:12 pm

If it is a 1954 Kestrel 66 it will be blue with a 125cc 13D engine and a frame No beginning "U"
If it is a 1955 Kestrel 69 it will be black with a 150cc 30C engine and a frame No beginning "V"
There are 1/2 width hubs on the Kestrel 66 and full width on the Kestrel 69, there are a few other differences , but this will give you an idea, both bikes have plunger rear suspension and are the only two models in the FB range to be sprung this way.
The frame No is below the saddle where the top tube meets the vertical tube below the saddle
JH
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piston 197
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Re: identification

Post  jagman2015 on Sat Nov 21, 2015 2:41 pm

It has the plunger suspension not sure what colour it was it's black now was told it was 125 but not 100% I will look at the frame and have a look I need to reassembly the front forks so always helps to know which bike it is

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Re: identification

Post  jagman2015 on Sat Nov 21, 2015 2:45 pm

I know the engine number is 958A/8026 and the frame number is 4382 not sure of letter before it

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engine Number

Post  piston 197 on Sat Nov 21, 2015 3:35 pm

958A is a 147cc 30 cc engine issued to both James and FB for the 1955 year model, frame numbers above 3000 will be the model 69 ( black) 150cc Kestrel the letter you cannot make out before the number will be a "V" so it looks as if you have a Kestel model 69 from 1955.
it is possible to put the 125cc barrel and head onto the 150cc engine and what you have been told about it being a 125cc maybe true, quick check if the carburettor is on a manifold boled to the cylinder with 2 bolts it is a 125cc , if the manifold is a cast stub that is part of the barrel it is a 150cc
JH
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Re: identification

Post  jagman2015 on Sat Nov 21, 2015 3:44 pm

That's great it's just bolt onto the barrel I 've got a bit to keep my busy on it as was last on the road in 1974 and don't know why the front forks where taken apart

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carb fit

Post  piston 197 on Sat Nov 21, 2015 4:07 pm

If the manifold bolts to the barrel then it has to be a 125, all 150cc engines have just the round cast tube, that cannot be removed, the carb pushes onto this .
But if you need to be sure whip the head off and measure the bore
125cc engine is 50mm bore
150cc is 55mm
JH
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Re: identification

Post  jagman2015 on Sat Nov 21, 2015 4:17 pm

I'll check on the bore the engine I think needs to be rebuilt

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Re: identification

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