Float Levels 350 - MVAgusta.net
 
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post #1 of 8 (permalink) Old 08-21-2017, 10:28 AM Thread Starter
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Float Levels 350

Hi does anyone know the settings for float levels and where it is measured on the 350B?

thanks
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post #2 of 8 (permalink) Old 08-21-2017, 10:43 AM
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What is the type of the carbs ?
Square VHB or round UB

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post #3 of 8 (permalink) Old 08-21-2017, 02:47 PM Thread Starter
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Hi yes its the round carbs
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post #4 of 8 (permalink) Old 08-22-2017, 03:05 AM
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Hi,

The original UB24 B2 and BS2 carbs are fitted with "0 gr 9" float bowls.
those floats dont have to be settled, there is only one possible needle position.

On my bike (a 1973 350 Scrambler,) i had a strange fuel problem with those carbs, the settings were good and i suffered of flooding carb when i rode the bike at mid range revs.
After a long love and hate story, i found what was the problem :
It was due to vibrations which affected the fitting of the float needle on his seat at circa 4.000 rpm and flooded the carb. This effect did not appear in other driving conditions or when i was setting the carb idle.
This was due to the carbs head rubber gaskets which were too old. They should be smooth enough to act as vibration filter.
The carbs inlets are fitted to the head with three screws with springs to act against the vibrations, they must be
screwed at the "good torque" to have a compromise between good seal and vibes filter !!!
It is also a good solution to link the two carbs with a flexible rod between the two bodies.

Later, i fitted VHB 24 carbs of an IPOTESI that gave better and easier carburation.

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post #5 of 8 (permalink) Old 08-22-2017, 03:26 AM Thread Starter
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Thanks for your replies

My carb has a brass float arm which is adjustable and hooks into the floats pin top
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post #6 of 8 (permalink) Old 08-22-2017, 04:22 AM
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Yes, it's an original fittment, earlier system : direct pin / seat model and later system : arm / valve / seat models, were both used on the 350 MV's.

The top cap of the float is different with each type of float but the float body is the same.

Your float bowl is a non adjustable model, the arm puches a valve on the seat, nothing to set, the arm has not to be bended or modified, its original shape give the good fuel level .

The two models are prone to the vibrations effects, my carbs were of the same model as your's.

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Last edited by GTW36; 08-22-2017 at 04:25 AM. Reason: Complement of informations
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post #7 of 8 (permalink) Old 08-22-2017, 04:57 AM
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Oh the arm type, the float weight is 5 grammes.

If your brass arm has been modified or bent, the distance between the upper surface of the arm fork and the upper flat surface of the bowl cap should be 5mm.
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post #8 of 8 (permalink) Old 08-22-2017, 05:33 AM Thread Starter
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That is fantastic information thank you I will measure that and check. The reason I thought it needed adjustment was when I took the carbs off one bowl had a lot more fuel than the other. My bike has just developed a stuttering at low revs which clears when the revs hit 5 then it takes off like a rocket?
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