Are jet kits just plain jets? Are they some that you can just go buy for cheaper if you know the ones to get. Can anyone tell me which ones to buy for a 300EX if possible? THanks

 

Jets are jets- the dyno jet kit is just K&N's kit they put together. Their sizes are a bit different than the one's you can buy at your local dealer. Either will do the EXACT same thing. It's much cheaper just buying jets from your local shop- just ask for 3 jet sizes bigger- you probibly won't need smaller since you'll probibly be increasing airflow with taking off your air box lid or doing exhaust work.- Even dropping in a bigger piston will cause a rejet. So just buy a few sizes bigger. They'll know the stock size at the shop.

What ever jet size everyone else runs won't be the same as what you'll run (even if they have the EXACT SAME setup) each bike has a sweet spot and only time and testing will tell.