will changing the intake track length require a re-jet other then the 280 main that is already on there?

 

It may not...the only real way of knowing is to do it...

You may be able to compensate the jetting with the air mixture screw....A good rule of thumb would be if you can get the bike running with 3 full turns or less on the adjustment screw your fine...after 3 turns you need to change the jets.