Formichino rear bulb sizes.

Moto Rumi technical problems or solutions
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Orac1000
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Formichino rear bulb sizes.

Post by Orac1000 » Wed May 08, 2019 5:02 pm

Can anyone tell me what size the 3 bulbs should be in the rear light. I have some 6V5A festoon bulbs x 38mm long over-all. These seem to be a bit too short for the centre light and far too long for the outer two. The parts manual says the main bulb should be 3amp but the outer two don't seem to exist in the book. I assume my book must pre-date the stop lights being fitted.

Anyway I need the size and length. There seems to be led lights available on Ebay. Should I swap to these instead?

Thanks

John.

Orac1000
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Re: Formichino rear bulb sizes.

Post by Orac1000 » Wed May 08, 2019 5:05 pm

Sorry meant watts not amps I think.

hugomez
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Re: Formichino rear bulb sizes.

Post by hugomez » Wed May 08, 2019 7:45 pm

Hi John,

3 bulbs?, all my Rumi, (including both scooters) only use one bulb at the rear light. No brake light. As far as I know, that is the way they came from factory.

Do you have to mount brake rear light in UK?

Why three bulbs?, what is the purpose of the third one?

I am very curious.

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

greasy-fingers
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Re: Formichino rear bulb sizes.

Post by greasy-fingers » Wed May 08, 2019 9:57 pm

rumi scooters came without brake lights just a rear light, the rear light backplate is generic to many lightweight Italian motorcycles and can also be found as the top part of some light backplate/number plate panels, they usually come with either 2 or 3 bulb holders, it is wise to fit a brake light for your own safety either using the existing spare bulb holders or an led replacement, you will need to adapt a brake light switch of some sort.

Orac1000
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Re: Formichino rear bulb sizes.

Post by Orac1000 » Wed May 08, 2019 10:17 pm

Hi Hugo,
Yes, you have to have a brake light in the UK. Both my Rumis had a switch on the break pedal. The centre bulb is the back light the two outer ones are for the stop light. I'm uncertain what the rating on the stop light should be. On a normal 12v motor the back lights are 5W and the stop are 21W but I'm not sure the magneto on the Rumi will provide enough power for 21W so I'm hoping someone will know.
If i don't get an answer I will probably get some LED bulbs as they are available in 31mm length which should be about right. I will also get one for the centre as you can get them 41mm long. I have had to bend the tabs in at the moment to fit the 38mm bulb. When I bought them I didn't realise they came in different lengths for the same power rating. I bought a box of them thinking to make them all 5W but they didn't fit being either too long or too short.

The bulb that was fitted to back light was 12V5W so that was wrong anyway.

Orac1000
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Re: Formichino rear bulb sizes.

Post by Orac1000 » Wed May 08, 2019 10:33 pm

Just been looking at the LED bulbs. They all take DC current but doesn't the 6V magneto throw out AC current? Will they work?

greasy-fingers
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Re: Formichino rear bulb sizes.

Post by greasy-fingers » Wed May 08, 2019 10:39 pm

you will find a 21watt bulb will be too much for the standard rumi electrics and is likely to reduce the power of the headlight dramatically , I use modern 12volt electrics on my rumi,s with 35/35 watt headlight and led rear and brake lights. with your standard 6volt rumi stator you are going to be restricted to a 25/25 headlight and 3 0r 5 watt rear light 10 watt brake light, you may find the brake light reduces power to your headlight when the brake s applied, far better to use led for rear and brake light, these are available in 6 volt as many maicolleta owners use them. however the maicolletta lights are battery powered which some led,s prefer.

greasy-fingers
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Re: Formichino rear bulb sizes.

Post by greasy-fingers » Wed May 08, 2019 10:41 pm

we where responding together so missed your last post, I run 12 volt led,s on my 12volt ac rumi systems and have found some led,s work some don't.

Orac1000
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Re: Formichino rear bulb sizes.

Post by Orac1000 » Wed May 08, 2019 11:38 pm

Thanks Graham,

I will try some LEDs as they use less power. If they don't work I'll just get some shorter normal bulbs to fit the back plate. I wonder why they use two different lengths. It seems a bit daft to me. I do have some small gismos that turn 6V AC into 12v DC I suppose I could try that. The LEDs would probably work better.

Have you tried an LED headlight bulb? I suppose it would need a different fitting.

Regards

John.

hugomez
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Re: Formichino rear bulb sizes.

Post by hugomez » Fri May 10, 2019 3:13 pm

Orac1000 wrote:
Wed May 08, 2019 10:17 pm
Hi Hugo,
Yes, you have to have a brake light in the UK. Both my Rumis had a switch on the break pedal. .......
Thank you John for the clarification, and thanks Graham to you too for the detailed explanation about the bulbs. ;)
My little Formichino here: http://www.formichino.com/pictures1.html

Ian Skinner
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Re: Formichino rear bulb sizes.

Post by Ian Skinner » Sat May 11, 2019 11:58 am

Hi John

I don't think LEDs will appreciate an Alternating power supply, maybe I'm wrong?

Back to 12 Volt rear light bulbs. Many owners fitted these back in the 1950s and 60s in the hope of stopping them popping with the 6v alternator.

For brake lights, I use 4 AA batteries in plastic 6 volt packs taped to the frame on a motorcycle and taped to the crash rail under the left hand leg shield on a Formi. So far, these have lasted almost 10 years. I have always been a front brake first rider!!!

Ian
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formic
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Re: Formichino rear bulb sizes.

Post by formic » Mon May 13, 2019 9:13 pm

There used to be,on ebay,a red festoon led bulb that was described as non polarity sensitive.I purchased a six volt one and it worked either way round.
This made me wonder if it might also work with ac current so I fitted it in a Rumi rear light .Sure enough a very slightly pulsating light but quite bright
and perfectly adequate for a stop light.You may still find them advertised.
Good luck
Michael

Orac1000
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Re: Formichino rear bulb sizes.

Post by Orac1000 » Tue May 14, 2019 10:04 am

Thanks for the suggestions. I was thinking of using some of these gizmos. 6V AC goes in one end and 12V DC comes out the other. Has anyone tried it.
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