Jetting for 03 RM 250

2

210zook

Member

Jan 14, 2004

9

1

• Jan 14, 2004

• #1

Does anyone have any suggestions on jetting for an 03 RM 250? I have a Pro-Circuit pipe/silencer, No Toil air filter, run 91 octane pump mixed w/Yamalube @32:1. I live in Arizona, about 1500' elevation, it's currently in the 60's and 70's daily. I went 1 step leaner on the pilot from a 48 to a 45, one position leaner on the clip, and I am way rich from stock on the main, from a 175 to a 185/190. The problem I have is the bike runs very lean. Most of the riding I do is on motorcross tracks that are 3rd and 4th gear midrange to full throttle(sometimes). Any info would help.

 

J

jackdrinker

Member

Apr 11, 2003

431

0

• Jan 14, 2004

• #2

maybe i'm reading this wrong.....but...... are you trying to jet down from a rich condition or fatten it up from a lean condition?

 

2

210zook

Member

Jan 14, 2004

9

1

• Jan 15, 2004

• Thread starter
• #3

I am trying to richen up the mixture from mid to top/ 1/2 to full throttle. The bottom is good. Everything I have read so far on jetting for this bike says to go leaner than stock, but I feel that I would risk blowing up the motor. I have also read to change out the slide to a leaner one, but once again I think it would harm the engine.

 

0

02'Cr Rider

~SPONSOR~

Nov 20, 2001

216

0

• Jan 15, 2004

• #4

210 zook, My jetting is 162 main,48 pilot,stock needle 2nd clip form top,7.0 slide,A.S. 1 1/4 out.Its ran on race fuel with temp now in the 60's at 1500'.But has a pro circuit pipe and spark arrestor,and rad valve.I have ran the main jet to 158 main before but was a little too lean.READ this from mods forums.


http://www.dirtrider.net/forums3/showthread.php?threadid=90804

 

2

210zook

Member

Jan 14, 2004

9

1

• Jan 15, 2004

• Thread starter
• #5

Thanks for the info!

 

Z

zookieman

Member

Jul 7, 2003

118

0

• Jan 15, 2004

• #6

2003 SUZUKI RM250
Main...165
Pilot...45
Needle...stock
Clip...3rd pos.
Air screw...1 1/2 turns

I live in michigan