MXA'S 2013 YAMAHA YZ450F MOTOCROSS TEST: THERE IS ALWAYS A ... (4) Exhaust. The stock YZ450F muffler is very choked down. It has grown 2 inches longer while being squeezed down from 33mm to 30mm since 2011. The combination of a longer canister and smaller core slows the revs down, hampers throttle response and ... Read more on Motocross Action Magazine
Rats! There's a rodent ret
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