Suggestions to help my '03 450 chug better


23 replies to this topic
  • randal

Posted September 05, 2011 - 01:28 PM

#21

I am new here to this site. I have an 03 wr450 and was wondering why my bike (CA model) comes stock with a 45 pilot and 150 main jet? 2004 and up have at least a 165 main jet. As far as I know there is no difference between the 03 and 04 other than the pesky woodruf key right?.
I have a FMF powerbomb header and tail pipe, grey wire cut, snorkel removed,sides not cut out of airbox, and throttle stop removed,. Does anybody know why the 03 is jetted so lean? should I go bigger on the main jet to 160+? will it get worse gas milleage if I do?

  • Krannie McKranface

Posted September 05, 2011 - 02:10 PM

#22

I am new here to this site. I have an 03 wr450 and was wondering why my bike (CA model) comes stock with a 45 pilot and 150 main jet? 2004 and up have at least a 165 main jet. As far as I know there is no difference between the 03 and 04 other than the pesky woodruf key right?.
I have a FMF powerbomb header and tail pipe, grey wire cut, snorkel removed,sides not cut out of airbox, and throttle stop removed,. Does anybody know why the 03 is jetted so lean? should I go bigger on the main jet to 160+? will it get worse gas milleage if I do?


All CA models are lean for EPA 'reasons'.

160 main is about right, and your mileage will drop.

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

Posted September 07, 2011 - 10:03 PM

#23

Thank you for your help, I think I will pull my spark plug and see what color it is. Thanks.

  • Krannie McKranface

Posted September 09, 2011 - 05:58 PM

#24

Thank you for your help, I think I will pull my spark plug and see what color it is. Thanks.


You can't really judge much by plug color, unless you use Race Gas ...... pump gas is filled with 'aditives' to keep it profitable and have longer shelf life.....and can burn brown, yellow, or black with the same jetting.

Seat of the pants or AF meter....or follow the stickies closely and copy a succesfull tune.




 
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.