JD Blue vx Red and Main Jet
Posted July 18, 2006 - 01:10 PM
Staying with the Blue needle (#3) and switching to a 168 or 165 main (from 170) or switching to the Red needle (#4 or #5) and staying with 170 main.
Can needles and jets be interchanged I guess is the question.
Posted July 18, 2006 - 03:46 PM
The blue needle is for winter and used in summer for heavily modified bikes with loud pipes. Summer time the red needle will give you more crisp throttle response in the 1/4 to 3/4 throttle range.
Posted July 18, 2006 - 06:21 PM
Check the Thumper Jetting FAQ for the details, or just start with Indy's jetting chart. He knows his $hit, so it'll usually get you pretty close.
Posted July 19, 2006 - 02:59 PM
The blue needle is for winter and used in summer for heavily modified bikes with loud pipes.
Indy, please clarify heavily modified and what you consider a loud pipe? I've followed your jetting chart to the letter and my bike (05 WR) still isn't perfect. It's starting to get annoying.
Posted July 19, 2006 - 09:51 PM
Posted July 20, 2006 - 04:41 AM
Use the red needle in #3 from the top with a 168 main jet and 48 pilot jet on your 05. Fine tune for starting with your fuel screw. The blue needle can be used for a wall pin. The 170 main with the YZ pipe with red needle ran stronger than with the blue across the board. Remember the 03 and 04 WR's are not like a 05 for jetting. Some extra air box holes also help, try running the bike with the filter side cover off. If it runs better with more air flow add some vents. With this jetting I can get up to 35mpg. Hope this helps.
That's exactly what my jetting specs are. It still hesitates slightly on decel or once in a while at steady throttle. It's a helluva lot better that it was when I started but's it's not perfect.
Posted July 20, 2006 - 10:44 AM
What are your conditions, temp and alt?
Posted July 20, 2006 - 09:19 PM