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Ciao,
Sono inglese e utilizzo uno strumento di traduzione online.
Un altro proprietario di "Monsone" potrebbe dirmi quale carburatore dovrebbe essere montato?
È un UA17 o UA17 S o UA17 BS ???
Penso, ma non ne sono sicuro, che: -
"BS" indica il lato del filtro dell'aria/l'ingresso/il lato della tromba non filettato. (Filtro dell'aria fissato tramite morsetto).
'S' è il lato del filtro dell'aria/l'ingresso/il lato della tromba è filettato.
Esiste solo un "UA17"? Oppure ottengo un 'UA17S' o un 'UA17BS'?
Attualmente ho un "UB20" collegato e non funziona se non al tick-over.
Grazie per qualsiasi aiuto.
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Hi Rabbit-Ala Verde,
nice to read that a Monsone will run on the UK roads! Very appreciate.
The original Dell'Orto carburetor for the Monsone 125M is the model UA17. But sometime it's possible to see engines of this motorcycle (and also for the 125N, nickname "Cigno") with the UB20 fixed on a special cylinder with 20 mm collar instead of the 17 mm as on the most part of the Monsone 125M.
The round air filter, with alloy body, is fixed on the carburetor UA17 using the inside thread of the filter.
Hope these infos could be useful to you. But if you have more doubts or questions, do not esitate to contact our club.
Best regards.
Enrico
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Thanks for replying. I have read elsewhere the 'B' after the number means the carburettor is for a 4 stroke engine. Externally identical, internally different due to the different fuels used ( petrol or petrol with added oil)
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I will be attaching a UA17S to the Monsone soon.
Can anyone confirm the correct jet sizes please?
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Unfortunately I do not have the use and maintenance book for the Monsone 125M. And on the Dellorto catalogue at the voice "MACCHI" there are the specifications for the UA 17 BS used on the 125N Cigno, Zeffiro 125 and Ghibli 125U but nothing (and this is a big surprise) about the Monsone 125M. Tomorrow I'll check the carburetor on my Monsone 125M and I'll tell you the correct jet sizes in place. Ciao
Enrico
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With some surprise today I removed the Dellorto carburetor from my unrestored Monsone 125M. Surprise because I discovered that the standard carburetor on this model is the Dellorto UB 22 S and not the UB 17 BS used on the other 2 strokes of the early Aermacchis (Cigno 125N, Ghibli 125U, Zeffiro 125). I checked another Monsone 125M and also this model has the same Dellorto carburetor.
Here the setting for the UB 22S:
- high speed jet 97
- low speed jet 40
- main nozzle 262
- metering pin B1
- throttle piston 60 gr.
- float 7 gr.
So now you can try to find a UB 22S carburetor for your Monsone 125M. But before check the dimension (diameter) of the intake manifold of your cylinder. Hope these info could be useful to you.
Enrico
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Many thanks. Our Monsone had a 22 fitted but won't start / run properly. After checking the specs we bought a 17... At least we can now check out jet sizes.
We are missing the elbow piece between the carburettor and air filter. Can anyone help?
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The part (elbow) you need is very difficult to be found. Best is to contact a Dellorto specialist that could have it. Try on the web or contact Luciano FRIGERIO, via Picasso 16, Seregno (MI), mobile phone 0039-338-2469941, home 0039-0362-229700. He his a Dellorto specialist, his father worked a life for the carburettor factory in Seregno.
Ciao
Enrico
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A close up photo or two of your Monsone carburettor, elbow and filter would be useful to us.
Can you tell me what the angle is of the correct elbow?
75 degree or 50 degree elbows are listed here... www.oldtimerworkshop.com/files/DellOrto_UA_B.pdf
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Here a couple of pictures of the UB 22S Dellorto dismantled, the bowl is fixed on the right side. The angle seems to be 50 degree, I imagine. Hope these pictures could be useful to you.
Enrico
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Thanks. We'll start a hunt for a 50 degree elbow. I'll post a pic of our Monsone when it's running.
Going to double check the timing.
Any tips with timing of a Monsone? Presume 'normal' procedure.
Are they troublesome to start?
Thanks, Martin
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Usually these 2 strokes Aermacchi engines are very simply and easy to start. Timing is the same of the Cigno-Ghibli 125U- Zeffiro 125.
Enrico
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Better news. After doing a pressure test, decided to look at the crank seals.
One was replaced and the engine had much improved compression.
Finally able to start the engine.
Unfortunately, I think the repeated kicking over in recent times took it's toll on the kick start spring as it snapped.
So now in the process of looking for a new kick start spring for the Monsone.
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Very difficult to find a new spring for the Monsone (it's identical to the one used on 125N Cigno, Ghibli 125U, Zeffiro 125 and so on). Try on the web (better Italian sites like subito.it or ebay.it). If the research will be impossible, we can try to reproduce one. But it takes time... Enrico
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We're having a couple of spings made up. Should have them in a couple of weeks. Then hopefully we'll be finished!
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16 replies since 12/1/2024, 08:00 175 views
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