HEADS UP!!!

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
Patrick Layher

WR450 carb prob

16 posts in this topic

I'm new to this and an 08 wr450. I bought it in the Bay area and brought it home to Wyoming where I ride it between 4500 and 9000ft. The guy I bought it from(49 yr old in a mid life crisis) pulled the smog, installed a Leo Vince slip on and I dont know what else. It starts good, runs good at lower rpm's and accelerates great. The problem is, at a sustained, elevated rpm (like running up the road in high gear 55 mph) it cuts out constantly like its running lean. When I throtle up it's right there, then hold steady again it cuts out again. What do ya think?

Thanks,

Pat

Share this post


Link to post
Share on other sites

Sounds like you need to re-jet your carb.

You can try to lower the needle (move the clip 2 positions closer to the top/flat) and see if that improves things. You probably too, need to run a smaller main jet.

Share this post


Link to post
Share on other sites

if you don't feel like messin with it you can get a jet kit and use their recommendation they are generally spot on or real close. Or do what william said and you'll probly get there too.

Share this post


Link to post
Share on other sites

Is the 07 still affected by thr TPS sensor issue? My 04 did this and after reading in here about disconnecting it to see if it goes away (it did) I now know what needs to be done.

Mike

Share this post


Link to post
Share on other sites

I agree it feels/sounds like a main jet mixture issue, but it acts/sounds lean and I would think it would be rich coming from sea level to 4500ft...?

Do I have to remove the carb to re-jet or pull clips?

Pat

Share this post


Link to post
Share on other sites
I agree it feels/sounds like a main jet mixture issue, but it acts/sounds lean and I would think it would be rich coming from sea level to 4500ft...?

Do I have to remove the carb to re-jet or pull clips?

Pat

kinda sounds rich to me but I could be wrong. Not sure on aluminum frame wr but you can probably do it on the bike by tilting the carb and I assume you can get to the access hole in bottom of carb bowl.

Share this post


Link to post
Share on other sites

Changing pilot, main and needle/clip position can be don one the bike. You do not have to tilt the carb.

Share this post


Link to post
Share on other sites
Changing pilot, main and needle/clip position can be don one the bike. You do not have to tilt the carb.

hey you don't have to tilt the carb, sorry never owned a carbed alummy bike

Share this post


Link to post
Share on other sites
Changing pilot, main and needle/clip position can be don one the bike. You do not have to tilt the carb.

Really? I have an 09 and I can barely see the carb. :banana:

When I did mine I was pulling the rear shock at the same time, so I pulled off the rear subframe ... but I really don't see how I could have gotten into the top/bottom of the carb with it on the bike and the subframe on.

Share this post


Link to post
Share on other sites

Tank off, you can get the top of the slide chamber off using a ball end allen, same goes for removing the needle plug.

Bottom of the carb, after craining, remove the 17mm cap, a 6mm socket on the mina, a Motion Pro 90 degree tool on the pilot.

Doing all of the above is a five minute job.

Share this post


Link to post
Share on other sites

I agree with the last post. You can see very little of the carb. The large plus in the bottom of the bowl is only like 2 inches from the crank case. How do i get to the clip to lower the needle?

Thanks,

Pat

Share this post


Link to post
Share on other sites

If you remove the top motor mounts it makes for some more room. Its really not as difficult as some people make it out to be. Special screwdriver for the pilot also helps.

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