I have an 07 trx 400ex and it has a KN air filter and a black hmf slip on and i was wanting to know how much larger of a jet i should get. I am also going to be removing the spark arrester from the hmf slip on when i do rejet it. Im not trying to ramp this thing up with HP, i just want it to be right. Im trying to get this thing to last for ever cause its barely been ran. Thanks!