I think goober is referring the the ‘needle jet’ operated via the diaphragm. The pilot adjusts air/fuel mixture.
Pretty sure I’m right, I’ll happily stand corrected though lol
98 300 Fourtrax 4x4
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2004 Foreman 450S
Fully overhauled (nut & bolt rebuild), 2” lift kit, 28” mega mayhems, ITP delta rims, ES floorboards, 22” LED lightbar, Pyle Bluetooth sound system.