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Concentric Carb upgrade
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Sponge
Lancashire (A chip shop somewhere near Preston)
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May 9, 2021 - 1:57 pm
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I have 'upgraded' the concentric carbs on two bikes. I have fitted 'stay-up' floats and viton needles to both. I am now finding it difficult to 'ickle' the carbs.....usually the fuel seeps out of the tickler hole and wets your thumb but on both bikes now I cannot get the tickler to do this. It goes up and down fine but no matter how long I stand there with my thumb on the tickler nothing happens. Both bikes start eventually and seem to run OK...I was wondering if anybody else had noted this strange effect after fitting the modern upgrades ???

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Number6
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May 9, 2021 - 5:22 pm
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Different carb I know, but I put a new float in my 261/1, now the tickler does nowt - it's too short, won't reach - gonna have to solder an extension on to it I think.

Maybe same with yours?

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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Sponge
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May 9, 2021 - 5:28 pm
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Number6 said
Different carb I know, but I put a new float in my 261/1, now the tickler does nowt - it's too short, won't reach - gonna have to solder an extension on to it I think.

Maybe same with yours?  

Interesting comparison. I can feel a carb off and strip down coming on.

Its hard enough to start the bike on a cold spring morning without a traditional tickle but come next winter it will be downright impossible. So I am resigned to bite the bullet. Ho hum. Many thanks.

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Stoo63
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May 9, 2021 - 9:02 pm
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Try the excellent Villiers Parts. I believe they have "long" ticklers, matron 🙂

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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cocorico
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May 10, 2021 - 7:50 am
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Bear in mind that if your tickler is too long you can damage the tickled part. In fact, the function of the tickler is not to flood the chamber, only to raise the level a little in order to richen the mixture, so you don't actually need to wet your index finger using it.

Apologies if any similarities between Grandmothers and sucking eggs apply.

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stubaker58
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May 10, 2021 - 8:28 am
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Slightly off topic.

On the Monobloc on my D7 when I press the tickler petrol comes out of one of the holes at the base of where the air filter screws on.  What’s going on there? The bike starts and runs but will not take an air filter and does choke up after idling for a while e.g. at traffic lights, this clears once it’s all moving again.

Help!

“There’s nothing new under the sun”.

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Sponge
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May 12, 2021 - 8:30 am
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stubaker58 said
Slightly off topic.

On the Monobloc on my D7 when I press the tickler petrol comes out of one of the holes at the base of where the air filter screws on.  What’s going on there? The bike starts and runs but will not take an air filter and does choke up after idling for a while e.g. at traffic lights, this clears once it’s all moving again.

Help!  

Hi Stu, I have a theory.....need to dig out a 375/31 from my vault and run a test.......will get back to you in next day or two. 

Sponge

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stubaker58
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May 12, 2021 - 2:48 pm
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I checked the jetting and found it to be awry so I’ve put it back to spec as per the parts book. Still got petrol coming out of that hole though!

“There’s nothing new under the sun”.

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Fisambard
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May 12, 2021 - 3:34 pm
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We’re these the Premier type concentrics?

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Sponge
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May 12, 2021 - 5:51 pm
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No.....just older original Amal concentrics off various bantams.

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