I want to know what I should do to my ex. Should I rejet or change my gearing. I want both speed and. I just put a cobra exhaust on and I didn't have to rejet. Now I want to know what I should do now, But I dont realy want to rejet, But I want more SPEED and I also want to know what brand of spockets is the longest wearing besides sidewinder.

 

Buy a big bore kit,install a high performance cam&valve springs,have the head ported,buy a bigger carb,run race gas.It all depends on how much money you are willing to spend.But before i sank a lot of money in a 300 ex why not just get the 400 ex and have a hell of a lot better all around machine.Seriously it makes no sense to thrash the heck out of a 300 ex making it faster and better when you can have one right out of the box that is great for 1,000$$ more.Please don't get upset with me i'm just stating the facts.If you are just dead set on the 300 ex try having the head ported,and installing a better cam w/springs.This will get more out of the pipe and you will surely have to re jet for these mods. sscott

 

I don't want a 400ex because with what little mods I have done so far will keep up with a 400ex. I also don't like the looks of a 400ex and it has no reverse. if maybe it looked better and had a reverse it would be a better quad but the way it is now I won't have one so there.

 

I've got the 300 ex and i feel your pain,i just think that for most people with 300 exs that want to make it better would be happier with the 400 ex.I would like to buy one myself maybe next year.
Anyway, i forgot to mention that if you get a cam and springs,get a rev-limiter upgrade with it.I read that it works well with the cam upgrade.You could also check into a higher compression piston.The cam upgrade would only cost around 120.00 and the rev box upgrade is somewhere around 90.00 aybe less,but thats not much coin and should make a huge difference coupled with the pipe and airbox mods.
I'm looking into better shocks for mine maybe the tcs shocks.I bottom the fronts out quite alot,thats why i think i would be better off with the 400 ex cause i like to jump and get great air,and the 400 is better built for this.See ya,good luck on your 300 ex.scott

 

if you think a pipe on a 300ex will keep up with a stock 400ex your full of **** espacally when you get a cheap *** pipe like corbra

 

Look here mother ****er you don't know **** about a four wheeler because I have done other mods besides any way I 300ex will out pull, climb, or run a 400ex and if you don't believe me you can come right on over here and eat my dust bitch because you ant worth **** to no one.

 

There is no way that that your four wheeler will out pull, out climb, or out run a 400ex!
But... I forgot you have a magic 300ex that will run 76-79MPH!