Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0

03 yz450f water in airbox

3 posts in this topic



First I'm gonna introduce myself, since I'm new here. My name is Nino, and I'm from Croatia. I've recently bought cheap 03 yz450f, and had it rebuild :)


I mostly ride woods and trail with alot of mud and water. After every ride i wash my bike, and clean air filter. I see that there is mud in the airbox, so i guess that water gets in.


Can i somehow reroute air intake to airbox, so water would not get in? Is there any DIY mod?


Thanks and nice regards from Croatia :)


p.s. sry on my bad english, it's not my native :p


Share this post

Link to post
Share on other sites

Air is intended to enter at 4 main points; the two "hand holes" in the sides, under the front of the seat, behind the gas tank, and under the back edge of the seat.  


At the front, there should be a mud flap that lays against the top of the back of the gas tank and down along the top of the frame to about where the shock is.  If you don't have one, make one.


Unless things get really crazy, there isn't too much of a problem with water coming through the side holes.  Most of that happens at low speeds.  The back fender and seat can be a problem.  Quite a lot of water can run down the fender under the seat.  Then it runs into the back of the air box.  Some people tape pieces of cord or fuel hose onto the fender under the seat so that it makes the shape of an upside-down letter "V", pointing up and toward the back of the bike.  That keeps most of the water moving off of either side instead of running down the middle.


Remember that YZ air boxes have open drains.  If you get them deeper than the bottom of the box, water just runs in. 

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
Followers 0