03 wr 450 TOO HOt to handle


4 replies to this topic
  • kwakebord

Posted October 02, 2005 - 08:43 AM

#1

Ok, have a serious problem, o3 wr450, sat for 1.5 yrs, gas was'nt that bad, drained it, flushed carb, changed oil, checked coolant fluid, started it up, and the header turned red hot in under 50 sec., Could carb alone make it run so lean this could happen?? radiators were very hot, so I knew water is circulating, oil is up to level at dip stick, had to keep bumping the choke to keep it running, I cleaned out main, idle, and the other jet next to main. all were clear to begin with. I just recently fixed a sheared flywheel keway, all went perfect there, FREAKY Where to start, how do you find indys jetting chart?? yeah, I havent figured this site out yet..Thanks Ken

  • griffithds

Posted October 02, 2005 - 09:04 AM

#2

Did this thing run fine before it was put away for 1 1/2 yrs? If so, then I would not mess around with the jetting other than cleaning the fuel passages. There is something else wrong with your bike.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • old man dan

Posted October 02, 2005 - 10:04 AM

#3

The pipe will glow red after just a little idling time but 50 sec sounds a little fast. The bike is probably lean, I would disassemble the carb and clean it properly (you might as well rejet with JD kit at the same time).

  • Indy_WR450

Posted October 02, 2005 - 07:21 PM

#4

First consider an 04 starter upgrade as per my instructions on this web site:
http://www.wr450.com...inals/index.htm

Jetting Recomendations:

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

  • RichBaker

Posted October 03, 2005 - 03:32 PM

#5

Clean the pilot jet and everything else, blow out ALL jets and passages with compressed air. Don't poke wire thru the jets, it's a good way to screw them up...




 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.