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HELIBROKE
rrNovice Dallas Texas |
Old Rossi 60 Helicopter Engine Anyone out there have the set up instructions, for the above Engine.
It is a Two needle Carb, with a idle screw adjustment.If so, please contact me !! |
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Notar
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/From another forum... RossiEnginesUSA CARBURETOR ADJUSTMENTRossi engine carburetors have two needles, adjustable for idle speed and maximum speed. The max speed setting is between 1.2 and 2 turns open from the closed position. First adjust the max speed with the throttle fully open. Next, close the throttle to run the engine at idle speed. The idle speed adjustment is based on where the highest rpm is achieved while the engine is idling. If the engine loads up and quits while idling, the idle adjust screw should be closed to make a leaner setting for the idle fuel mixture. If the idle screw is closed in too far, the engine will quit suddenly at idle. The idle screw is very sensitive and should only be changed in 1/8 of a turn increments to fine-tune the engine.After the idle adjustment, check the max speed and transition from low to high.When the idle mixture and max speed needles are adjusted, the engine will have fast response and transition from low to high speed./ |
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Notar Try searching Rossi carb settings ![]() ![]() ![]() |
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/I don't know why this instruction manuals don't care about initial neddles adjustment. ![]() |
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KJH Instructions from post #2 suggest 4-5 turns out (from closed) on high speed needle, as an initial setting. /Correct!But... What about the idle needle or screw ?... Nothing..!You need to figure out...If you mess with this idle screw, there is no way to know what is the initial setting.So, if we have 5 turns on high needle, let say 2-1/2 turns on this idle screw.../ |
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Rojoalfa If you mess with this idle screw, there is no way to know what is the initial setting.So, if we have 5 turns on high needle, let say 2-1/2 turns on this idle screw... ![]() ![]() |
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wjvail It appears that a good starting point for the low speed needle is "about 1/2 way". /Very good.Now, for this "half way"... We need to know how many turns need the idle screw to reach such "half way".../ |
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Rojoalfa Now, for this "half way"... We need to know how many turns need the idle screw to reach such "half way"... |
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