Sorry that was a typo on the stock gears it's actually 13/38.
Thanks for the clarifications!!

Another newbie question.... Looking at getting more speed for my sons Honda 300ex. I've installed a HMF completion full exhaust jetted his carb witha .125 hex jet and have a K&N filter, also installed a stage 3 rev limiter. The front end has been replaced with 400 a-arms and 450 shocks with new American Star tir rods. Looking for some guidance on what I can do to his gearing now. He has the stock 12/38 sprocket installed now and wondering what other pairing would help him with a little more speed/power. Any thoughts or experiences with the gearing? He'll be racing Hare scramble events a couple more years before he moves up to the 450 class due to his age.

Thanks in advance for any advise.

Thanks for the information! Yes he is racing and I changed out the stock 300 front end with 400 arms with 450 shocks.

I'm looking at getting my son some Hiper bead lock wheels but not quite sure what size to order? He has a 2006 Honda 300ex. Any direction would be gladly appriciated.

Hello all newbie here....

I just bought my son a HMF competition series full exhaust for his 2006 Honda 300EX along with the jet kit for Christmas. My question is the Basic Jet Kits Includes: Individual Keihin Hex Jet: 120, 125, 130 , which needle is going to give him the most power? Also he already has a K & N filter installed. As you all can probably tell this will be my first go around adding an exhaust system and a jet kit to an ATV. Thanks in advance for any help!!

Hello all newbie here....
I just bought my son a HMF competition series full exhaust for his 2006 Honda 300EX along with the jet kit for Christmas. My question is the Basic Jet Kits Includes: Individual Keihin Hex Jet: 120, 125, 130 , which needle is going to give him the most power? Also he already has a K & N filter installed. As you all can probably tell this will be my first go around adding an exhaust system and a jet kit to an ATV. Thanks in advance for any help!!