Choke on Formichino

Moto Rumi technical problems or solutions
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Orac1000
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Choke on Formichino

Post by Orac1000 » Mon May 20, 2019 5:20 pm

Can someone tell me how the choke on the 15mm carb for the Formichino works? My previous bike had a 22mm Carb which is different. This seems to have a plunger to press with a black rubber top. The plunger spindle however has a clip in a groove around its circumference which fixes it in one position. So how does it work?

Maybe I'm just stupid.

All suggestions welcome.

Regards

John.

hugomez
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Re: Choke on Formichino

Post by hugomez » Mon May 20, 2019 7:56 pm

Hi John,

At the Dellorto UA15S, press down the plunger to start the engine. With the engine warm, the plunger must be all the way up.

Greets,
Hugo
My little Formichino here: http://www.formichino.com/pictures1.html

Orac1000
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Re: Choke on Formichino

Post by Orac1000 » Mon May 20, 2019 9:56 pm

Yes but the spindle of the plunger has a groove around its circumference at about a third of the way from the top end and a spring clip that fixes it in one place so it can't be depressed. I'm baffled by it.

RF125
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Re: Choke on Formichino

Post by RF125 » Tue May 21, 2019 12:41 pm

Hi Orac, your system it's wrong, no Spring in the choke are needed, as you can see in the pictures.

You have one spring, because the choke surely goes down without to be pressed.
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Good luck!

Claudio

RF125
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Re: Choke on Formichino

Post by RF125 » Tue May 21, 2019 12:49 pm

To prevent it from going down you must place a clip like in the photo...

Screenshot_4.png
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Regards;

Orac1000
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Re: Choke on Formichino

Post by Orac1000 » Tue May 21, 2019 5:43 pm

Hi,
Its the spring clip item 13 that I am talking about. As this engages in a groove in the spindle it prevents the plunger from moving.

RF125
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Re: Choke on Formichino

Post by RF125 » Tue May 21, 2019 9:32 pm

well! it's ok... Do a little bit of strength and problem it's solved.

;)

Regards

Orac1000
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Re: Choke on Formichino

Post by Orac1000 » Tue May 21, 2019 9:46 pm

Ok. will do. Maybe a bit of lubrication is in order. It doesn't really look as if anything is amiss. I will just lean on it harder.

Thanks

Orac1000
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Re: Choke on Formichino

Post by Orac1000 » Tue Jun 11, 2019 12:26 am

I have replaced the choke slide for one off a Lambretta with a very similar carb (a Dellorto MA15). It looks like the spindle with the tab on top must have got lost at some time and someone made one. However they didn't make a very good job of it and the groove that the spring clip engaged in was too deep and prevented the thing from moving. Anyway its ok now.

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