WR450 carb prob


15 replies to this topic
  • Patrick Layher

Posted August 05, 2010 - 07:48 PM

#1

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

  • William1

Posted August 06, 2010 - 03:45 AM

#2

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.

  • tech24

Posted August 06, 2010 - 03:59 AM

#3

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.

  • miweber929

Posted August 06, 2010 - 04:06 AM

#4

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

  • Patrick Layher

Posted August 06, 2010 - 06:45 AM

#5

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

  • tech24

Posted August 06, 2010 - 06:57 AM

#6

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.

  • William1

Posted August 06, 2010 - 09:32 AM

#7

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

  • tech24

Posted August 06, 2010 - 10:25 AM

#8

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

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  • Patrick Layher

Posted August 06, 2010 - 11:30 AM

#9

Thanks, I'll try it out

Pat

  • usedtobefast

Posted August 06, 2010 - 11:51 AM

#10

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.

  • William1

Posted August 06, 2010 - 12:07 PM

#11

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.

  • Patrick Layher

Posted August 08, 2010 - 07:21 AM

#12

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

  • Patrick Layher

Posted August 08, 2010 - 07:22 AM

#13

oops, I didnt see the last post

Pat

  • PirelliMan

Posted August 08, 2010 - 07:52 AM

#14

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.

  • Patrick Layher

Posted August 08, 2010 - 07:02 PM

#15

Thanks for the great advice William1. Lowering the needle 2 spaces fixed it! Thanks!

Pat

  • William1

Posted August 09, 2010 - 02:39 AM

#16

Good deal!




 
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