Jd Jetting Kit

[bandit99]

I have a 2005 WR450 and I have finally given up on the JD jetting needles. I just can't get rid of the mid throttle flat spot and believe me, I have tried every possible combination. I think the needles are not shaped right for my bike. Good thing my friend works at a shop that designes jet kits and can dyno the bike. They will make a kit perfect for my bike.

[Fullbore4]

Yah I agree the JD jet kit richens the mix a lot. Just for kicks, I would add the Powernow and see if you can't get a little more air through the carb. I use the JD red on 4th clip with a powernow and my 06 runs good.

[WR450RICKO]

GYTR AIS removal Kit is all you need

[bandit99]

I have the AIS removed. I drilled some holes in the air box and put the 1" uni air filters in it so it was getting more air. I am not going to spend the money on the power now. With stock jetting it runs smoother than with the JD kit.

[WR450RICKO]

The GYTR kit has an adjustable needle, 48 pilot jet and throttle stop along with plugs for the AIS ports. I had mine put on the dyno and had to turn the air screw out 2 3/4 to make it run most efficient. Big differnece from stock to free mods to AIS kit to Dyno.

[bandit99]

If I didn't have my buddy to tune it I probably would try the GYTR kit. I probably will pay the price of the kit to have him do it. I'll let you know how it goes.

[Ramcc4x4]

What part of California do you live/ride in? I normally ride my 2006 WR450 from seal level to about 2500 feet. I'm running the JD blue needle in the #3 position, 48 pilot, 170 main, the thick o-rings for the accelerator pump, UNI filter, "free mods", and PMB exhaust tip. I have no bog anywhere throughout the rpm range and mid-top is where my bike runs strongest. I originally tried the GYTR needle but the performance is much better with the JD needle. I had considered trying the Edelbrock carb because it worked so well for my XR650R but I can't justify the expense because I'm not having carb problems.

Did you open the two holes in your airbox and remove the snorlel?

[bandit99]

I have to apologize to the JD Jetting people. Apparently there is a problem with the carb that is making it un-jettable.

[Asgeir]

With all those happy customers using JD jetting, including me, there must be something good about those kits.

Good luck figuring out your problem

[RandyRooster]

I use the JD kit in my KTM 525exc and it runs great! I have installed the AIS kit on my WR450 and it made a big difference. I'm still tempted to get the JD kit for the WR just for flexibility with altitude changes. I ride from sea level to 14k and the ability to simply change a needle and a jet is too much to pass up.

[Just_a_trail_rider]

I have an 05. I run a 168 main, red needle 4th position, 48 pilot.

When I was running the stock exhaust can with a pmb insert, there was a definite bog, especially in that gray area between 2nd and 3rd gear. The problem I had was that third gear had very little on the bottom and did not pull strong. So I found myself always jumping between 2nd and 3rd gear to find some power.

I have since switched to an FMF pipe. Same carb setting, no real bog or hesitation. 3rd gear pulls real strong on the bottom now and I don't have to give it too much gas.

I literally ride in 3rd most of the time and it pulls nice and strong.

You may want to try a pipe or go up two teeth on the rear sprocket to keep your rpm's up.

What pipe are you using.