Sweet quad. Glad it fixed it (knew it would). Yes the posts were right. The 09-10 fixes the 2011+ yfz450r bog, but kills warranty. Yamaha was forced in 2011 to change te ecu tuning to be "carb" legal for CA. (Fing nazi state). So because of that the bog exists. There are a couple of methods to fix. Yes TPS sensor adjustment masks it but can pose other issues. Safest is the ecu chip like you got. Eariler ECUs will make it run good but can pose some risk as there are different. Sensors parameters on the newer vs. the older quad. Yes sucks you spend the $ but you got one hell of an upgrade that will keep on giving.


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