WR450 jetting Q's
Posted June 21, 2003 - 03:29 PM
Posted June 21, 2003 - 04:45 PM
I have rejetted to:
YZ 450 needle (NCVQ) 4th position.
Turned acc. pump adjuster 1\2 turn clockwise.
This is with all the free mods and uncorked pipe.
I am riding anywhere from 1000 to 6000 feet elevation. My bike has excellant throttle response with no hesitation anywhere. No popping or backfires on decel. I can tell it is a little rich in higher elevations but not to the point of sputtering or anything. You can just feel it loses a little and can even hear a differant tone in the exhaust.
I have been running the stock #70 PAJ. today I ran it with a #100 PAJ to be the same as the YZ. I thought that might cure the rich condition at higher altitudes. It did. But it was too lean on the pilot circuit. It developed some popping on decel and lost some of the hit off the bottom. It was unseasonably cold today though. That may have contributed to it being too lean. I will try the same combo when it is hot again to see if it gets better. I may also try the #100 PAJ with a #45 or #48 pilot. That may be just the right combo. All in all I am happy with the above jetting and the #70 PAJ though.
I am running the stock #65 starter jet and have had no problems with starting. Usually it lights up on the first rotation of the starter.
Hope this helps,
Posted June 22, 2003 - 05:01 AM
Here is a list of information to post:
STOCK WR450 JETTING
Pilot Jet- #45
Pilot Air Jet- #70
Fuel Screw- 1 1/2 turns out
Clip Position- #4 (counted from the top)
Main Jet- #150
Main Air Jet(None=#200)
(Correct me if wrong, this can be edited... thanks LTR)
Posted June 22, 2003 - 07:21 AM
Fuel screw changes with altitude and also as the day heats up. But for a base line it is 1.5 turns out for most of my riding wich is 1000-3000 feet elevation. This is with the #70 PAJ. With the #100 PAJ it was out 2-1\4 turns and this was above 4000 feet.
Also the Stock PJ is a #45 for the WR.
Posted June 22, 2003 - 11:25 AM
Posted June 22, 2003 - 02:24 PM
Posted June 22, 2003 - 06:38 PM
Yes, there is a jet kit in the works. A WR400/426/450 jet kit with altitude and temperature recommendations. There is also a YZ450F in my garage being tested with one of the custom triple taper needles.
The needles are a blend of WR and YZ needles made to smooth the transition from idle and give better over-rev capability. Expect more torque right from idle, improved mid-range equal to a YZF, and more on top by conforming an uncorked WR to YZ spec. The kit has been dyno tested on the KTM, altitude tested (to 12,500ft), and confirmed results by hundreds of KTM riders.
Look for it in the "Shop TT Now" cart in the next few weeks, after I iron out the details on clip position and main jets.
Posted June 22, 2003 - 07:23 PM
JD, since we are fellow Washingtonians you should send me over a kit to "test" out for ya on the WR. I could give you the feed back for the more arrid eastern side of the state.
Seriuosly though that is great news. I can't wait to give it a try!
Posted June 23, 2003 - 04:16 AM
You can sign me up for the jet kit as soon as it's out. I ride a lot of slow tight stuff here in GA and have had no luck with off idle bog.
Posted June 23, 2003 - 04:17 AM
Posted June 23, 2003 - 06:43 PM
Posted June 24, 2003 - 06:06 AM
Where did you get that Euro needle? I can't order one through my dealer. They said I should contact a European dealer to order the OBDUQ part.
Posted June 25, 2003 - 07:44 PM
NCVQ needle position #4
100 pilot air jet
1-3\4 turns out on FS
See my prior posts for results on PJ-PAJ changes. I went to a 45 pilot today to try it with the 100 PAJ. I think this combo is the best yet. Throttle response is the best it has been. It may be just a little rich in the transition into midrange but it's so close it's hard to tell. I'm not sure what to try next. Either lower the needle one position or go to a 40 PJ with a 70 PAJ. I think I will ride it where it's at for this weekend though.
Posted June 26, 2003 - 06:37 PM
NCVQ needle clip 3
155 main (I haven't tried any others yet)
42 pilot jet
100 pilot air jet
me + jetting =
Posted June 26, 2003 - 07:08 PM
Posted June 26, 2003 - 07:21 PM
Posted June 26, 2003 - 07:29 PM
james dean red needle 4th clip position
1.5 turns out
Baja baffle in
air box opened
I put the JD kit in and gain a big inprovement down low of stock.The thing screams from cruising to the rev limiter real quick.I'm real happy with the jd kit and hope to get some more power once i get a decent pipe on the bike.
Posted June 27, 2003 - 04:41 PM
Posted June 27, 2003 - 04:48 PM
You did get one of the first WR400/426/450 kits. James is in the process of putting the final touches on the kits and getting them packaged. We will be adding them to the TT Store soon so keep checking under the new products!
well here are my specs I think i got one of the first JD Kits