RE: K&B Sportster Club
I briefly ran my runner sportster today on one of the new carbs AW sent me, only had time to run a few ounces of fuel as I had errands to run but it mustered 12,840rpm on an MA 11x7 and a 2250rpm idle. I'll run it a little more tomorrow as I have an "RC day" planned. What little it ran today, it throttled better than it used to. I'll post back with further results tomorrow. Fuel was 5/25 and mc59 plug.
It spewed much less from the front bushing on the 5/25 fuel than it did on 5/20. I'm using the stock muffler without the baffle and today I used muffler pressure. Last time I ran it I got better rpm not using muffler pressure and just venting the tank.