WR450 stalling problem

Hi guys. I need some help with my bike, can't figure out the problem. WR450f 2005

My bike starts up fine, also the idling is right. But when i go on a straight (300m or so) and when i give it gas and go really fast (3rd or 4th gear) the bike just starts to die, or stall. Almost like it's running out of petrol.

And this only happens when i really give it alot of gas. It also happens when i ride slow (2nd gear) and keep on going for like 3miles or so. Then it does the same.

And then the bike would not start. I have to wait like 5-6 minutes.

Help will much appreciated!



i also posted this at the "general descussion page"

1. make sure the gas cap is venting'

2. make sure gas is flowing into the carb by pulling the hose and checking for flow

3. make sure your carb vent lines are not clogged

4. if you are loosing spark, then your stator is going bad

sounds like a clog in the fuel line or a problem with the float. 


Had a similar issue when I put on a fuel injection fuel line I had for my Husaberg 450 on my WR450F (figured it would be a bit more heavy duty).  Felt like my WR450F was running out of gas and running lean at higher speeds but if I waited a couple mins would start just fine and run at modest throttle openings.  Thought maybe I had a partially clogged pilot jet or main jet  Pulled off the fuel line at carb, turned on gas, plenty of gas flowed out.  Hooked fuel it back up, still had the problem.  Pulled off the fuel bowl drain and opened tank spigot...hardly got anything out.  Figured some type of blockage in the float.  What I ultimately figured out is that the inner rubber lining on the fuel injection hose was folding over and partially blocking the fuel flow when I hooked it up to the carb.  Put on the cheap fuel line and it worked just fine.


Lesson here is to verify gas is getting to the carb first and then filling the float bowl.  Could be a partial blockage somewhere along the way.


As Krannie indicated pull fuel line off and turn on gas to make sure it flows.  I also suggest pulling float bowl drain and turn on gas to make sure it gas is making it to float bowl and filling it fast enough.


If that doesn't show the problem then I would continue items 3 and 4 that Krannie listed above.

Did you recently buy this bike? Reason I ask is from personal experience. Previous owner screwed up the float adjustment not allowing the float bowl to fill with enough fuel resulting in similar issues your having.

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