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2005 yfz450r

Yamaha YFZ450/450R (2004-Present) - Yamaha ATV Forum - www.bluetraxx.com
I bought this atv on Saturday. Needs a little love. The elevation I was at when i bought it was 4000ft. I live in elevation of 3000ft. I ordered a jet kit waiting for it to get here. Mods it has are Athena 480 big bore kit open lid pro flow intake with k&n air filter. Yoshimura slip on and stock header. Dont know if it has any other engine mods but it's extremely fast. It idles great but problem im having is pipe gets red hot in 3rd and 5th gear it blows a huge fireball when you release the throttle after holding it for about 4 seconds at half way. I've done jet kits before but i dont know what size would be best with the big bore kit. Tried searching around and havent found much.


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