Main jet M6 Dellorto 150
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Dellorto carburettor M6 main jet Size 150 for all Dellorto carburettors from 17.5 to 24 mm. When tuning the engine, always install an oversized main jet. At full throttle the engine should start to stutter (4-strokes). Now you should jet down in increments of 5 until the engine runs smoothly.