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2014 yz250 f air box mod

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I had theses plastic tops made to go on the upper cover of the air cleaner they give more plenum above the filter and w drwith added holes in the front more air with out increasing sould the top of the stock plastic is cut out to match the new lid on a 250 it added a bout .5 hp peak and over 1 hp in the over rev where hesrtsfalling off they look pretty good and give the bike some character  and for $69 they make more of a diference than an after market exhaust .

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Im just getting going on theses yamahas and have not done a lot of testing im sure theres gains in the boot mod or the teams would not be changing them I foun huge gins on the Honda 250s using mototasanari boots and modifying the velocity stacks

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Im just getting going on theses yamahas and have not done a lot of testing im sure theres gains in the boot mod or the teams would not be changing them I foun huge gins on the Honda 250s using mototasanari boots and modifying the velocity stacks

 

Let us know your results. 

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Has anyone cut down the short velocity stack in the 14,15 air box for a more open area draw of air?

What were the results?

What is this 450 boot mod also?

Edited by yz250f 78

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