Jetting is real close, but not perfect! HELP!
Posted August 21, 2003 - 01:51 PM
I have recently switch my 02WR426 to YZ timing and YZ exhaust. I am running an EKN needle in 4th clip, 160MJ, 160 MAJ, 38PJ, 65PAJ and fuel screw at 1.5 turns out! The bike rips once opened up, but when cruising at a steady pace it wants to hesitate and has minor popping. It does not sound like it is running smoothly and you can feel the hesitation come on and off. I do not really notice it on the trails, except real low rpms. I mainly notice it when I jump on the road coming home! It is most noticeable at roughly one third to half throttle. Do I need to raise the needle one clip?
Posted August 21, 2003 - 03:35 PM
Posted August 21, 2003 - 04:32 PM
Posted August 22, 2003 - 11:22 AM
Posted August 22, 2003 - 01:37 PM
Posted August 22, 2003 - 02:50 PM
Posted August 22, 2003 - 03:10 PM
Posted August 22, 2003 - 03:19 PM
Posted August 22, 2003 - 04:00 PM
Posted August 22, 2003 - 05:07 PM
Posted August 22, 2003 - 05:43 PM
Sounds like your getting to know your carb.. Earlier this year I embarked on a jetting Quest. Did several tests with MJ from 155 to 175, PJ 35 to 48, EKN, EMM, EMP needles. I ended up at EMP3, 38PJ, 160MJ. When I tested the EKN clip 5 was good. Clip 4 and 3 were terrible but clip 2 was the best on that needle. That is not a typo, clip 5 or 2 were good and in between was terrible, as to why I have no clue. Didn't count but I must have tried 50+ combo's, ended up very happy with the results. Ordered the JD kit because I like to tinker. Returned it to all stock jetting with the Blue needle on 4 and everything was great. In the heat the Red 5 seems better. Either needle is very strong, no pops or bangs, starts great hot or cold, fuel screw 1.5. I will run Blue 4, temps 70 or under, Red 5, 70 or over. I can only speak for myself but first try with the JD kit was as good as 50 attempts with the E taper needle. Have fun.
Posted August 22, 2003 - 07:05 PM
Posted August 23, 2003 - 01:26 PM
Posted August 23, 2003 - 02:08 PM
Posted August 23, 2003 - 03:50 PM
Try clip 2, that was my best setup with the EKN.
Posted August 23, 2003 - 11:39 PM
Try a #40 or 42 pilot jet with your #65 PAJ to see if the lag is lean.
The small PJ/PAJ combinations were developed by Taffy using an EKM#4 (EMM#5) needle setting. This is richer on the diameter or in the 0-3/8 throttle range and where you are looking at. He also had no "Air cut valve".
As you go to a bigger pilot jet, the fuel screw can be turned closer to 1-1 1/2 turns to keep the idle clean running and have it richen at 1/8-1/4 throttle. For example, a #42PJ/#65PAJ and 1 turn out may be what you're searching for with EKN#3-#4.