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Yamaha yz 450f 2008

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I bought a 2008 yamaha yz450f not long ago and i put a FMF titanium mega bomb with a titanium factory 4.1 exhaust system and i need to know what the jetting specs for the bike are with that pipe system on it i called FMF but they did not have the jetting specs and they told me to come here.

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I bought a 2008 yamaha yz450f not long ago and i put a FMF titanium mega bomb with a titanium factory 4.1 exhaust system and i need to know what the jetting specs for the bike are with that pipe system on it i called FMF but they did not have the jetting specs and they told me to come here.

From stock pipe and jetting, you would want to go up one size on the main.

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