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Update on carb rebuild S25 Mark 3

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Update on carb rebuild S25 Mark 3

Post  A10 JWO on Sun Aug 30, 2015 2:16 pm

Whilst rebuilding and cleaning the carb on my newly purchased Falcon 81. I have noticed that the plastic float is quite a floppy fit on the main shaft. I simulated the float bowl with a drinking glass filled with water to the desired level. When I engage the tickler the float moves down as it should, when released the float seem to bind at an angle on the main shaft, I think this may also be a problem causing flooding by not pushing the fuel needle fully home. Has anyone else had any issues in this department. The brass shaft seems even on my Vernier gauge. Any advice would be appreciated.
Regards Colin

A10 JWO

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float bind

Post  piston 197 on Sun Aug 30, 2015 5:03 pm

I would either
A . try a brass float
B. sleeve the hole in the plastic float with nylon , to prevent it tipping, by making it a closer, parallel fit on the brass centre
??
JH
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piston 197
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Float

Post  A10 JWO on Sun Aug 30, 2015 5:21 pm

Hi Piston. Thanks for reply, cannot see how to sleeve a small gap. Will go after a brass float when the shops open Tuesday.

Regards Colin

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sleeve

Post  piston 197 on Sun Aug 30, 2015 5:25 pm

Thin wall brass, or nylon will do the job, personally I would use brass, only need .010 wall thickness or so .
JH
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piston 197
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Not Guilty

Post  ChrisTurner on Mon Aug 31, 2015 10:41 am

I know this bike well, and it was nver fitted with a plastic/nylon float when I knew it. Go for the brass item as originally fitted. Chris
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ChrisTurner

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Float for S25 Mark 3

Post  A10 JWO on Mon Aug 31, 2015 1:56 pm

Thanks Chris. Will order a new brass one Tuesday.

Thank you for all replies.

Colin

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Carb flooding, now it's not.

Post  A10 JWO on Wed Sep 02, 2015 4:38 pm

Following the replies on this thread I rang Villiers Services and spoke to Louis with a view to ordering a new brass float. He informed me that they only do plastic. I gave him the symptoms of the carb flooding after releasing the tickler. He explained that the new needle was the problem. The lower half is square and the rest round. Where the two shapes meet the squares edges are sharp and dig into the insert. This causes the jam and flooding. He told me to file down the square edge where the two meet. I did this with a fine file, reassembled and bingo; no flooding. Laughing Thanks Louis, your a star and saved me money.
I hope this thread has not been too boring and may help someone else in the future.

A10 JWO

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Pattern parts

Post  piston 197 on Wed Sep 02, 2015 5:10 pm

Thanks for the above information, one to log in the memory bank ! the original needles are chamfered where the round section meets the square, presumably the manufacture of pattern parts does not get the same attention ? If Villiers services are aware of this problem with the new needles you would imagine they would be rectified before sending out ?
JH
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Re: Update on carb rebuild S25 Mark 3

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