intake & exhaust

Anyone out there running a K&N filter? How do they stand up to the odd splash of mud & water that enters the air box compared to stock? I'm looking to run one with xr's only slip on muffler unit.Any thoughts on this combo? The bike is a 90 xr600r ,stock motor.I now run a stock exhaust , baffle removed. hoping this pipe will provide more power than present set up & save me an lb. or two in weight. thanks to anyone who can help.

Anyone out there running a K&N filter? How do they stand up to the odd splash of mud & water that enters the air box compared to stock? I'm looking to run one with xr's only slip on muffler unit.Any thoughts on this combo? The bike is a 90 xr600r ,stock motor.I now run a stock exhaust , baffle removed. hoping this pipe will provide more power than present set up & save me an lb. or two in weight. thanks to anyone who can help.

First welcome to Thumpertalk. You should be able to find lots of answers here.

I think that the K&N filters are good for the road, but not so good in the dirt. They do flow more air at the cost of letting a little of the fine dust through. For the dirt a good quality aftermarket oil foam filter is best.

Since you are at low altitude, you will need to bump up the jetting some for best preformance. The changes that you are making will need richer jetting. You will get a little more power with this setup.

BWP Jockey, Welcome to TT......:cheers:

Myself, I like Uni filters.....

:p:bonk:

k&N is no good for dirtbikes! you want a foam filter!

I wouldn't say that the K&N is no good for dirt bikes, I have had excellent results with them in other bikes, but I did not like mine in my 650R. Due to the large outer rubber edge of the K&N, I felt that it did not seal as well as a foam air filter did. It also did not like the number plate over it; I had to do a little trimming to get the darn thing to close up and let the Dzus screws fasten.

The K&Ns due tend to let more fine dust particles (i.e. silt) through the filter. There is a reason that putting a K&N in your car or truck will void the manufacturer's warranty! I run one in my old pickup, but I also pull out the MAF sensor every 50,000 miles and clean it as well, or the truck isn't happy.

In my bike, I run the OEM Honda or No-Toil Filters with a modified back plate (no screen, just an open grid to support the filter). They seal great, let in all the air I need, and are very easy to clean and oil. Plus with the foam filter, you can fold 'em up small enough to carry a spare with you if think you need to!

I have run the UNI's as well. They are also a great filter, and I love the 'neoprene' edge and the included aluminum back plate. I just have a great sponsorship from my Honda dealer and it is much cheaper for me to go with the OEM/No-Toil Filters (No-Toil makes the OEM Honda filter as well as the Pro-Honda Filter Oil).

I tried the Twin Air, and although I never saw any problems with that filter, it is thinner than the UNI or OEM filter and that turned me off a little. I know that the foam construction means everything, but I like a thicker filter. I just feel safer.

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