I did a bunch of engine work today - valves, timing, idle adj. Couldn't figure out the right way to adj the idle though. I drilled out the idle mixture screw, and was going to do the "lean drop" method for idle adj. (As per instructions in the tuneup and emissions manuals). However, the instructions call for doing the lean drop when the air cleaner is in place. The idle mixture screw is on the base of the carb, between the carb and the valve cover. This puts it right under the air cleaner - effectively out of reach. I could not figure out a way to get a screwdriver in there to turn the idle mixture screw. Any advice/tips mucho appreciated.