Carb rejet

[cvc42]

I just replaced my stock air box with a KN filter and I have a dead spot at when I throttle up. I am sure I will have to rejet the main jet?? I see the carb on Mikuni's wesite but no model number. Do I go up or down in jet size. Its getting alot more air now

Thanks

[Sjorge450R]

up... when you do mods to your bike like a K&N air filter, you quad is going to run leaner. If it is on a 300ex just change the main jet from 122 to the next size which is either 124 or 125.