OK!!! JETTING IS KICKING MY BUTT!!
Posted January 01, 2002 - 08:43 PM
4th pos on needle=Big time fouled plug
3rd better but still fouled. 2nd was probably best but still lean @ 1/4 throttle. 1st notch=lean back popping at 1/4 throttle. Air screw never seemed to change anything. Needle I'm useing is a OBEKR (?) part # 5JG-14916-ER-00 providing I read the needle correctly. So I now lay at the feet of the jetting God's on this site hopeing they have mercy on me and solve my jetting problems.
Posted January 01, 2002 - 09:09 PM
Originally posted by SoCalWR426:
Air screw never seemed to change anything.
I would guess you mean fuel screw??? Check the duration and timing of the accel pump to make sure it is correct. If that checks ok, I would try the following. I might try the needle in the 2nd from the top position and try a 48 pilot. If that makes it feel better try the needle in the 3rd from top position.
If I am correct, the 02's do not need the BK mod??
Posted January 01, 2002 - 09:18 PM
[ January 01, 2002: Message edited by: freestyle111 ]
Posted January 01, 2002 - 10:10 PM
Have to clarify that one. Took the damned carb off for some reason or another, and realized how EZ it is.
[ January 02, 2002: Message edited by: John H ]
Posted January 02, 2002 - 05:29 AM
Posted January 02, 2002 - 05:55 AM
I Will try both Ernie's and Yamakazi's sugestions. If anybody else has idea's I would like to hear them.
Ernie..Mr BK said 02 does not need BK mod...Heard both good reports and no change reports. If this won't work that will be next. I can alway's go back to stock.
Posted January 02, 2002 - 05:59 AM
On this forum(?), I read one guy's 02 bike had a APJ duration of 4.5 seconds!!!
You'd think after a few blips, HE WOULD RUN OUT OF GAS!!
Posted January 02, 2002 - 06:27 AM
This is exactly why I wrote the tuning guide. There is nothing more frustrating than wasting time changing the needle all over the place and not being able to solve the problem.
Try needle EKN or EMN or ELN or EJN... they are all the same except for clip position. EMN is from Sudco, the others are from Yamaha.
The last letter is needle straight diameter and mostly affects jetting near 1/8-1/4 throttle. EKR has a pretty lean straight diameter (2.755mm). The CRF450 uses EKR#4, the '00YZ426 used EKR#4. You should have been able to run the EKR#4 and adjusted the pilot screw to compensate to avoid any plug fouling. A slight 1/4 throttle lean condition will still be present though.
Posted January 02, 2002 - 12:48 PM
* EMN Needle @ #4
* 175 Main Jet
* 48 Pilot Jet
* Pilot Screw 1.75 Turns Out
* 100 Pilot Air Jet
* Accelerator Pump Timing Screw 1.9 Turns Out
* Accelerator Pump Squirt 0.7 seconds (+-)
Hope this helps.
Posted January 02, 2002 - 01:23 PM
Obviously your spread sheet is worth the mere sum of $19.95. It sure would save alot of hair pulling. P.M me your address and I will get $ in the mail...Only sickler though is I have web-tv and no printer. It's a good place for my pocket fisherman to sit when not in use
Posted January 03, 2002 - 05:56 AM
The Jetting Guide is an excellent resource! Thanks James for your great work.