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Mikuni FJ8-6F09 Jet Needles - 62.3 Needle - 28.9 Length to Taper electrical-gauges-components-air-fuel-gauges 1995 Polaris Trail Boss 30010mm 2. 516. 20mm 2. 516. 30mm 2. 475. 40mm 2. 210. 50mm 1. 949. 60mm 1. 678. 30 38 Spigot Mount. The Jet Needle controls the fuel mixture in the mid range 1 4 3 4 throttle position. The taper of the needle determines the amount of the fuel. For example: the thinner the diameter of the needle, the more fuel will be drawn. The thicker the diameter of the needle, the less fuel can be drawn.