wr450 started pop-in


8 replies to this topic
  • byggd

Posted May 31, 2005 - 01:26 PM

#1

Last time I took my 450 out it was running perfect, brought it home washed it, ran it long enough for it to dry and parked it. Started it yesterday (a couple weeks later) to keep the battery charged and now it's popping and sputtering down low.

Any ideas??? :)

  • davecampbell

Posted May 31, 2005 - 02:18 PM

#2

i don't know how to fix the sputtering problem but you could fisx the red sticker problem by selling it to me because i live in az

dave
623-327-3795
dave@autotransportteam.com

  • WGP

Posted May 31, 2005 - 03:11 PM

#3

Mine tends to pop when cold, and sounds better when warmed up, however the problem is its to lean.. I would bet you need a jet job.

  • Texas4play

Posted May 31, 2005 - 03:38 PM

#4

Check the plug

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  • byggd

Posted May 31, 2005 - 03:45 PM

#5

WGP - If it needs jetting why would it run so good two weeks earlier?

Texas - A bad plug can make it pop? It was replaced 20 miles ago. :)

  • WGP

Posted June 01, 2005 - 06:21 AM

#6

Jetting changes with TEMP, Humidity, Elevation, so winter to summer, it may have needed jetted and you just didn't realize it, thats what happened to me. I thought it was running great, then it started popping when cold, then I jetted, now it starts quicker and flat out rips, the fastest bike I've ever ridden. :) :D

  • byggd

Posted June 01, 2005 - 07:09 AM

#7

WGP. Thanks for the advice I'll give it a try. What jets did you go to? I ride from 1000 4000 evevation

  • WGP

Posted June 01, 2005 - 08:24 AM

#8

Copyied From Sticky: I haven't messed with the starter or pilot jets, just the needle and Main, plus installed fuel adjustmant screw (great for frequent elevation changes.


Here is what works for me and you guys can use it as a starting point to jet your WR450 bikes only!

(Note: do not use these for WR426 or WR400 due to carb differences!)

This recommendation requires air box flow mods and an open stock or aftermarket pipe and ACV circuit intact.

Elevation 0 to 4,000. feet

30 to 45 degrees: 172 main, JD Blue #5, 48 Pilot, 2.0 turns, 75 starter jet, #0 leak jet
45 to 60 degrees: 170 main, JD Blue #4, 48 Pilot, 1.75 turns, 72 starter jet, #0 leak jet
60 to 75 degrees: 168 main, JD Blue #3 or JD Red #5, 48 Pilot, 1.5 turns, 70 starter jet, #40 leak jet
75 to 90 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 68 starter jet, #50 leak jet
90 degrees plus: 160 main, JD Red #4, 45 Pilot, 2.0 turns, 65 starter jet, #60 leak jet

Elevation 4,000 to 8,000 feet:

30 to 45 degrees: 170 main, JD Blue #4, 48 Pilot, 1.75 turns, 72 starter jet, #0 leak jet
45 to 60 degrees: 168 main, JD Blue #3, 48 Pilot, 1.5 turns, 70 starter jet, #40 leak jet
60 to 75 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 68 starter jet, #40 leak jet
75 to 90 degrees: 165 main, JD Red #5, 45 Pilot, 2.0 turns, 65 starter jet, #50 leak jet
90 degrees plus: 160 main, JD Red #4, 45 Pilot, 1.75 turns, 65 starter jet, #60 leak jet


Elevation 8,000 to 11,000 feet: ( Note you will loose a lot of power due to altitude but your bike will idle and not foul plugs!)

45 to 60 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 70 starter jet, #40 leak jet
60 to 75 degrees: 160 main, JD Red #4 , 45 Pilot, 1.75 turns, 68 starter jet, #50 leak jet
75 to 90 degrees: 158 main, JD Red #3, 45 Pilot, 1.5 turns, 65 starter jet, #60 leak jet
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03-02-2005, 09:10 PM

  • byggd

Posted June 01, 2005 - 10:24 AM

#9

Cool Deal! It has the adjustable idle mix screw so tonight i'll scheck out the jets.

Should have known it would come from Indy. He has so many posts I sometimes wonder when he has time to ride :D (JK Indy :) )




 
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