Not Ranked
I have the oval filter with a single carb. Instead of cutting a lid for a rectangular element like Undy, I was thinking of the round top element with the center bolt down. I think it's 9" round by K&N. This was years ago but I never followed through with it. I now have a 445 which makes more power than I need and I have lost all interest in squeezing any more from it. Good enough. I did discover that with the 1 3/4" filter element, that a carb with the choke horn will drastically reduce air flow because the filter lid is almost making contact. So I did away with the choke horn. In SoCal the choke is not needed probably because of our superior blends of fuel.
John
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