Had one & took it out. It was a bad choice.
Early on I thought the K&N would be a good idea to prolong mtce so I ordered one and put it in after adding a Sidecar to the bike. The idea was to minimize the hassle getting into the air box with the Hack Brackets on the bike.
After getting into the Shelter several times to do other mtce & trouble shooting I checked on the K&N while in there & noticed a very thick build up of Black Oil Slime in the Throttle Body. Each time I cleaned up the area and let it go. Each time I did more work under the shelter I looked and found the same build up of slime. Putting 2 & 2 together with comments from Stu O. who noted others that had severe Idle problems due to build up's in the Throttle Body caused by the Oil from their K&N's I removed mine to avoid the same situation which involved bikes running so slow at idle they stalled the engine etc.
Note that I had installed the K&N as it was out of the package in it's Pre-Oiled state and had not Re-Oiled it so the Build Up was from the filter as it was supplied.
The logic behind the Slime in the Throtle Body is that without having an Accelerator Pump, like carburators have, dumping fuel in the area & thus keeping the Oil Residue washed off it will deposit & stay untill it blocks the air flow with the butterfly in the Idle position. :shock:
At this point my K&N is sitting in the top of my tool box waiting to be pitched along with the Honda CB PTT Passenger control as just another bad investment. Sometimes it is hard to throw $50 bill's in the trash but not quite as hard as it is to pitch three of them at one time. :roll:
As a long time K&N user it's hard for me to say that it's a no-go in this Wing.
Jerry