K&N Ersatzluftfilter

It is installed in 2007 WR250X. I cleaned it well with Cleaner and applied Oil once because it ran over 8000km. When it is wet, it takes 2 days to dry, and 3 hours to dry after applying oil, too much time. On a sunny day, we can clean it in the morning and apply oil in the evening. It is really easy, and the performance is improved.

I recently did a thorough comparison between the wet Sponge filter and this one.
Our 2007 WR250X is not so suitable for Off driving as it can be driven Off normally. (Sucks up a lot of sand) So I changed back to the OEM Air Filter, but the Torque and Pickup are still down in all areas. Especially from 6500rpm up, I feel like I lost about 50cc of bore.
Torque up which can really be felt, Pickup rise, and the maximum speed is also quite different. Fuel consumption is also improved by about 1km per liter.
A lot of good things.
So I have already decided. Basically, I decided to k&n the MOTARD because it is used for On roadMain.
If it is only DirtSection in Course, it is no problem, and the forest road and Off running are made to run with WR250R and wr450f.

It's really obvious that the performance is improved when you replace the OEM air filter.
By the way, our WR250X is a combination of Junjo Exhaust pipe and YOSHIMURARS4JSlip-on Silencer. It is Meter correction Plus3 of Junjo ECU.
Honestly, various combinations. (FMF Q4 and Tadao PowerPipe, Delta barrel4 and DeltaTorque head pipe, FMF Q4 and DeltaTorque head pipe, Delta barrel4 and Tadao PowerPipe, YOSHIMURARS4J and Tadao PowerPipe OEMExhaust System and Tadao PowerPipe, YOSHIMURARS4J and DeltaTorque head pipe, YOSHIMURAR2 and OEMExhaust pipe) I feel it is the most powerful, sharpest pickup and best sound and ride in the world.

Yoshimura Japan recommends OEMExhaust pipe, YOSHIMURARS4J, k&nAir Filter Quantity:1 Set of 3-items is the best combination for the best performance and the best value for money. The exhaust system is made by an exhaust system craftsman and is a completely exclusive design, so the performance is excellent. I highly recommend this to all my fellow WR250X riders.

Well, I got on a roll and went out for forest road touring with WR250x from this morning, but there was an incident that worried me a little. We ran off-road with this Air Filter for a test, but as expected, dust and sand adhered to the inside of the Air Filter.
If you are going to run off-road, I think a wet air filter is the way to go.
So I will use this one to run only On road.

Today, I practiced at the test course near my home after a long time from the afternoon with my wife and children all gathered. Our 2007 WR250X and my wife's course exclusive 2009 WR250X finally became the same specification of Exhaust System, Exhaust pipe and Air Filter.
The combination of OEM Exhaust pipe and Yoshimurars4J Exhaust System and k&nAir Filter with NORMAL ECU, only co-correction with Meter, aisCancellation and Solenoid removal Flap full open fixed. SUPEREasyLightCustom.

Last month, when we measured the section time, course lap time, and maximum speed for each section, our WR250X had SP Tadao PowerPipe2 and FMFQ4. (Meterco correction is +6 with Spark arrester equipped) Spec. was.

This is not a pretty course, but it is a very tight course with lots of rugged Tarmac hairpins and tight turns on a neighbor's landowner's property. The whole week is 5km long.
We measured the difference in performance well on the grounds, which are almost as fun as those public roads.

Surprisingly, the Lap time and the section time were the same as the current OEM Exhaust pipe and Yoshimurars 4J with k&nAir Filter. (Meterco correction is best at +3 after all) was the fastest!

The sense of myself who actually drove it was also dramatically good in the sense of the sharpness of the rise to instantaneous power, the sense of torque, the goodness of the balance of the handling and the strength of the stimulus, and, after all, fun and exhilaration.
The difference was particularly noticeable in the speed at which each section was reached:the pickup accelerated sharply and the speed ride was good in proportion to the feeling of acceleration. (The longest section, Straight, is about 800m) At the highest speed measurement point, there was a difference of as much as 13 km, and on average, the others had a difference of 3 to 6 km in the speed of reaching the section.

The Tire is the same as the last time I ran the course, and the only thing I replaced was the exhaust pipe and silencer, so I can say for sure that the current Spec. is the fastest in ECUNORMAL condition.
Please try the combination of OEM Exhaust pipe and Yoshimurars4J Exhaust System with k&nAir Filter.

You can taste the best feeling.
Of course, you can still enjoy the great feeling with the OEM Air Filter!

Lastly, this Air Filter of YOSHIMURA collaboration is the original sticker of k&n, and in addition, YOSHIMURAk&n collaboration MetallicSticker is also 2Quantity!:It comes with a set. And it's cheaper than the original, which is a good thing.

Yes, my main machine WR250X and my wife's WR250X, which is only for the course, have tried and played around with FMFQ4, SP Tadao, Delta's Full Exhaust System, usYOSHIMURA, and so on. The result was that the combination of OEM exhaust pipe and YOSHIMURARS4J was the most fun and the best balance of performance. Let's see OEM ECU (Easy Spec. to enjoy with fuel correction with intake Solenoid and ais removal Meter) This Filter is perfect for
That's why I'm going to use this guy on my wife's Course-only WR250X.
I'm buying another one.
A little Torque up of the book from low speed to all over the range and Pickup after mid RPM is pretty good.
And Sound is also very good.