Recently installed this jet kit in a 03' WR450 after installing an FMF Q4 slip on exhaust. I ended up removing the O ring on the accelerator pump as it gave a bit too much power for trail use. Directions were far better than the ones that came with other big name kits and the performance exceeded my expectations.
JD Jetting Jet Kit
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Dont even mess with your carb, buy this kit, follow instructions, twist throttle. Expensive for a couple pieces but so worth it. This is the first thing I buy for any of my bikes.
2011 WR450F Installed an FMF titanium exhaust but it ran lean, backfired and stalled. I fellow rider recommended the JD Jetting. THe power and delivery difference was very noticeable. Spendy, but worth it.
Motosport is awesome
I love these kits! I put them in all my bikes and suggest them to friends.
After installing the jet kit it made a noticeable difference in throttle response and overall power. I contacted JD customer support and gave them my location and they recommended a different setup than what was in the instructions so i went that way and it worked great. Definitely recommend
I have used jd kits atleast 8 times and on every occasion they are spot on with their kits.
This was an easy performance upgrade. Directions we super easy to follow and the correct jetting was super easy to figure out and get in the ball park. This improved my top end performance dramatically.
Installed on an 09 WR250F made the bike a completely different machine instructions were easy to follow with pictures used the recommended settings and haven't needed to change anything comes with the o-ring mod I used the thinner one incase it breaks I still have a back up the only thing the instructions didn't say was that you have to remove the top motor mounts to roll the carb back and forth which was very easy paired this with the a Dr.D slip on and have power all through out the throttle
Jd jet kit was a perfect upgrade!! Have a few jets to swap out when teps drop or go up!! Tuned the big out of my 08 Ktm 200xc I use on a motorcross track!!
Best throttle response ever been much better power throughout the whole range
Bought this along with the procircut t-4 pipe for my kx250f and it gave it a pretty noticeable power boost
JD jetting is a must have for KTM 530's
The kit works great and is more forgiving than stock needles.
They also have great customer service for any application questions.
Worked well with my 3x3 mod and new exhaust. Must buy for the DRZ
I read a lot of reviews regarding different jet kits for my 07 CRF 450. JD Jetting Kits had, by far, the best reviews and now I see why. Not only is the packaging and products top notch, but the installation instructions the easiest to read and follow that I have ever seen. I am still trying to get everything dialed in with my bike but I know I will be able to with this kit.
super easy install, performance greatly improved!
I have installed JD jet kits on a crf150r, crf250x, and crf450x. They have been spot on the first time on all three bikes. Good step by step instruction's
The kit comes with a larger idle jet which isnt shown in the pictures. If you are handy with tools, you will have no problems installing the jets. I have found that it improves the starting ability of this bike which can be difficult. It started in lower 30 degree temps after several twists to the throttle. It starts in warm weather easily. Also, it will bog less during warmup. It seems to have better low RPM throttle control also.
Easy directions for installation and to get a baseline. The jet kit really cleaned up the throttle response on my bike.
Mikuni main jet- 370
Mikuni main jet- 390
Mikuni main jet- 410
Mikuni main jet- 430
Mikuni pilot jet - 35
BLUE MARKED NEEDLE (Standard)
RED MARKED NEEDLE (Leaner 0-1/4 throttle)
These kits usually only come with a single pilot and multiple mains and needles.
They are spot on with the kits in most cases but if you have an extreme case of multiple mods it may be best to order the kit and a single pilot to finish it off.
JDH014 - Honda CR125 (85-99)
JDH012 - Honda CR125R (00-08)