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HOW A CARBURETOR FUNCTIONS : A carburetor supplies the cylinder with a mixture of fuel and air, which is brought to explosion, which in turn, releases energy. Only through correct carburetor adjustment can you get maximum performance from your scooter. a larger carburetor needs a larger main jet. Rule of thumb: the main jet should increase 10% for every millimeter enlargement of the induction diameter. Getting your scooter to start at low temperatures can be difficult due to poorly atomized fuel or fuel condensation. You‘ll need either a manual or electric choke to get your carburetor the right air-fuel mix. Your carburetor can get more fuel by installing a larger choke jet, getting your better starts in cold weather. Ideal for hard liners down to minus 30° or for that tour you‘re planning to the North Pole. FULL LOAD SYSTEM. The Main Jet To fi nd the right main jet, start with a large jet and move down number by number till you find the right size. If you pull the choke at full gas (fatter mix) and this leads to poorer output or lower rpm‘s, then your jet should be a smaller number. Smut buildup in exhaust opening, darkened exhaust, burned spark plugs or improved motor performance with partially closed fuel tap are other signs of a too large main jet. The idle range jet. To determine jet size here, open the throttle slowly to about 10% (of the total). This should raise the rpm‘s smoothly. When the the rpm‘s fi rst fall and then return to normal, then you jet is too small. If your motor sounds as though the choke is pulled (stutters), then your jet is too large. This can be caused by a too widely opened mix adjustment screw or a too widely opened air adjustment screw. The larger the idle range jet, the fatter the mix.
Tags : weather ideal, carburetor adjustment, adjustment screw, jet start, fi nd, fi rst, jet size, cold weather, rule of thumb, motor performance, air fuel, move down, maximum performance, spark plugs, north pole
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