I bought a K&N filter for my 700. I’ve had K&N filters on all of my vehicles and never had an issue. However on the 700 its freer flowing ways make the engine run lean. Following a tip from a friend I looked for something to reduce the volume of the filter and ended up with an upside-down yogurt cup inside the cone filter. This should reduce the volume of air, increase the speed, lower the pressure, and help the fuel atomize. The yogurt cup definitely helped the performance of the K&N. Without it it barely starts and sputters and pops and won’t climb above 4grand. Once the cup is in place it will climb ok, but the exhaust still sounds “hollow” for lack of a better word and will backfire between 4500 and 5000 rpm. Once you get it past 5000 rpm it takes off and you better be holding on tight.
So I need to tweak my yogurt cup, or mebbe fiddle with the slow-speed jets…
An audio file of the exhaust note with K&N and yogurt cup installed can be heard here. The beginning of the file is at 2K rpm, the next step up is 3K, then up to 4K where you can begin to hear popping all the way up to 5K. The rev after that went straight to 8K with no resistance.