Howdy all,
I have been hearing some bad things about running a K&N filter on the SP 700 with EFI. They say it can gum up the EFI system. I would like to get this rumor straightend out once and for all. Is it good or bad???

Buck[img]i/expressions/face-icon-small-confused.gif[/img]

 

id dont see how it could. id like to hear the theory behind this

 

Well, they say that since it has more air flow that it wont filter out the smaller particles of dust. I thought it would be better than the stock paper filter due to the fact that it wont turn to mush if it gets wet, plus the fact that it lets that massive 700 breath!

 

you can always put the outerwear prefilter on too

 

If your paper filter is getting so wet that it turns to mush, Your biggest problem is not going to be the small particals. Back to topic - Most people that have problems with the K&N filters never take care of them. If you ride in any dusty conditions you should wash and reoil them every day for them to work correctly. Also apply they sealing grease to the inside of the mounting tube. Thats where a lot of dust can sneak by.

 

My KN filter (clean and oiled) would not let my 800 EFI hit over 5900 RPMs ....I put the paper one back on.

 

So is that all? No more inputs on the K&N??[img]i/expressions/face-icon-small-confused.gif[/img]

 

We sell alot of them and have never had anyone call with a problem that we know of and when we tested them we never seen any problems at all.

 

I have never heard of that before. I will buy it off you for $10.00.

 

It seems to me that you should not be changing either the intake or exhaust of any Polaris EFI quad unless the modification results in the same flow as stock. The reason is that the EFI system is incapable of adjusting the fuel flow for additional air through a low restriction filter. The reason is that there is no O2 sensor to allow the ECU to "close the loop" on. If you want to change to a low restriction air filter or change to a high flow exhaust, then you need to reprogram the ECU. Since this does not seem to be an easy task on the stock EFI, you might consider changing the ECU to one of the various after market ECUs. One very inexpensive solution, the Megasquirt allows infinite control of the fuel map. In addition, you can add either a narrow or wide band o2 sensor if you wish.
JMO
Bryce