Anyone tried the JD kit for a 426 yet?
Posted July 11, 2003 - 08:35 AM
Posted July 11, 2003 - 03:40 PM
Posted July 12, 2003 - 03:05 AM
Posted July 12, 2003 - 06:51 AM
Mike, Give us some FEEDBACK HERE! You owe me
Posted July 12, 2003 - 10:42 AM
For all JD and others have done for jetting, I'd be happy to send $65.00. The jets would be a bonus. Without the help from the pioneers my bike would run like crap, and I would be afraid to touch it. I have at least $100.00 worth or jets on the bench. To get jets and instructions for $65.00 is a steal.
JD, hats off to you. In the spirit of American Capilalism you have found a way to make a buck (I hope). To take your years of knowledge and experience, create special needles and have the courage to take it to market is great. I will order a set and if Taffy invents something I will buy that too. $65.00 is cheap.
Posted July 13, 2003 - 01:13 PM
Posted July 13, 2003 - 02:55 PM
Posted July 13, 2003 - 08:39 PM
1994 MMI graduate w/ honors from Theory to Advanced 2&4 Stroke Performance clinics....took it just for fun, so I'm not just talking outta my , and I'm still confused by jetting on occasion! Props to James for helping out the masses with some hard work, dedication and know-how
Posted July 14, 2003 - 04:45 AM
Posted July 15, 2003 - 01:31 PM
Would you mind describing your "red needle" and comparing it to say the EKP? If I understand correctly, it's a multi-tapered needle (is this even correct??)...and if so, what taper angles is the needle comprised of? What's the comparable code for the needle straight diameter?
I'm always looking to learn something new...so if it's not "sensitive info", please respond (or drop me a PM) when you have time.
Larry (used to be CO).
Posted July 16, 2003 - 10:35 AM
They are both triple tapered needles in the kit.
Without giving too much away, the needles (red & blue marked) are richer and leaner than EKP on the diameters. The red is leaner for hotter/higher/humid conditions. The blue is richer for colder/lower/dry condition. The red (#4) needle will run similar to EKQ#2 in the lower range, except there is a transition taper to avoid the lean 1/8-1/4 throttle range. (Avoids the weaknesses keeps the strengths)
The top end, 3rd taper, transitions to also allow the use of bigger main jets.
The 2-strokes have used triple taper needles for 15 years. Mikuni started with double tapered needles in the 70's, and then triple tapered in the 80's. At my request, Mikuni America sent me charts with all of the available needles graphed on paper. This was 20 years ago and I've been charting the new developments ever since. It took a long time for the manufacturers to get jetting to work this good.
Posted July 16, 2003 - 11:28 AM
Thanks for the info! Pretty neat stuff...I suppose one of these days I'll have to get my hands on one of these and check it out firsthand...
I suppose you've also updated your JD jetting excel spreadsheet to be able to support both the standard single taper needles as well as your new triple taper beauts...
Again, thanks for the reply...nice job!
Larry "used to be CO"
Posted July 17, 2003 - 02:16 PM
Posted July 18, 2003 - 05:32 PM
I'm glad you like the jetting kit. We have something in common with testing needle combinations. It took many more than 50 test runs to come up with the needle profiles. Much of it came from listening to others here. It's fun to see test runs make improvement, and getting to share it is gratifying.
Posted July 20, 2003 - 07:52 AM
Went back to all stock. PJ42, PAS75, MJ165, MAJ200, fuel screw 1.5 with JD Blue 4. Later today I plan on a little testing. I get one or two bangs on decel from high RPM other than that its great. The acceleration from 1/8 to 1/4 is much better than all other tries.
Posted July 20, 2003 - 10:42 AM
More testing today, ended up with jetting in my signature. Very responsive, no pops, bangs or other issues, starts great. I don't have the equipment to accurately measure and compare but this is a different needle. The tip is wide like a D taper so you need a larger main. Something is different at the end of the straight or beginning of the taper. The change from 1/8 to 1/4 throttle is very good, real strong. Other setups had a very small flat spot there. JD will sell alot of these.
Posted July 20, 2003 - 03:10 PM
Posted July 21, 2003 - 03:15 PM
1 3/4 on the fuel screw got rid of the bang on decel. I then took out the PAS and installed the stock 75PJ and this worked very well. No bangs and seemed cleaner on accel. with the FS at 1.5. From bottom to over 3/4 is great, some missing above that. Tonight worked hard on MJ. From 160 to 170, also changing MAJ from 200 to 160. Haven't been able to work out the miss. The next day or two I will test the 172 and 175MJ and see what happens. Its close but not perfect.
Posted July 21, 2003 - 03:18 PM