I’m still trying to get the K&N to work at low RPMs because I’ve tasted the increase in performance at high RPMs and I liked it. I first tried cutting the yogurt cup down by about half an inch, since this reduced the diameter of the lip it reduced the height of the cup inside the cone tremendously. Before the lip of the cup was resting on the pleats and the bottom of the cup was flush with the opening of the cone. With the cup cut so the outside diameter of the lip was exactly the same as the inside diameter of the bottom of the cone the bottom of the cup sat about 3″ below the opening of the cone.
Unfortunately this really made no difference in the running of the engine. It’s still too lean and popping. More popping than the full-size yogurt cup, but not as bad as the straight K&N filter. This got me to looking at the carbs, I try to avoid them as I don’t really speak french, but perhaps I need to start monkeying with the pilot set screws. While looking at them I notice that they have 3 spacers instead of the usual 1 for some reason???
In an earlier post I uploaded an MP3 of my exhaust with the K&N. Today I also recorded and mp3 of the exhaust with the OEM air filter.
Exhaust with OEM filter.
Starts at idle, then 2K rpm, 3K rpm, 4Krpm with some difficulty keeping a steady rpm, and up to 5K rpm. No popping or backfiring. A final rev straight to 8K rpm.
Exhaust note with K&N and yogurt cup installed.
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.