synergycycle
Active VIP Member
I have a 2004 yfz 450. it has twin air air filter, no baffel, and a 170 main jet. it starts and idles good. when I rev realy fast off idel it will bog, if I give it a little gas and pin her it revs no problem. I tried a 172 main jet and it was worse. should I go leaner? what is wrong?