pulling more power out of a stock 400ex

[Lorduss]

hey guys, loving my new 400 ex, i was wondering, im looking for easy to do, best bang for the buck mods to my quad, is there any restrictions i can remove ?

[yellowrider]

some people told me just to get the 14tooth sproket.. i am going to try that when i get the time to go there and get it.. and i am also getting i uni filter for mine and a cooler spark plug next time i take it to get service..

[MadcapEX]

Look around this forum there is tons of posts about this.
Throttle adjustment,14 tooth sprocket,grinding pipe welds,
K&N power kits,slip-on silencers,airbox mods.

[RoostinOna400ex]

How do you adjust your throttle??

[sly400ex]

Adjust the throttle. A lot of the times you are only getting 75% throttle if not properly adjusted. On the throttle, there is a little boot, pull it back and back out the adjuster screw until there is tension on the throttle.

Remove the choke and stick a 42 pilot in there. Your quad will start fine and also have more air flow and better throttle response and more power!

[RideRed400EX]

When I first bought my 400 I didn't have much money so heres what I did:

1) Modify the stock exhaust by drilling a hole in the back plate and remove the screeen from the spark arrestor. Next grind out the welds in your header (cost - Zero).

2) Add some Uni air box vents (six bucks) and get the K&N power kit (about eighty).

Don't expect it to be a new bike but these definately make an improvement.

what are those air box vents? do you have a pic of them. i was just gonna put an outerware cover on my air box.

[Kadafiy]

The vents are just little black things with foam inside that you drill a hole and then pop them into your airbox lid. You can see them in all the catalogs.