Both my 3206 and 4209 Yerf models were 2004's. Both came with 24mm CV carburetors with sealed air/fuel mixture screws and 110 main jets. Both were 100% stock when I bought them with no modifications. Yerf-Dog went out of business late 2005 or early 2006 before the EPA timeline you posted.
My 2006 Tank GY6 scooter used the same 24mm carburetor with sealed A/F screw and a 108 main jet.
Wasn't 2007 the introduction of tamper resistant float bowl screws so you could not easily alter jetting?
Last edited by GX150; 10-20-2015 at 09:12 AM.
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