Adjusting high speed main jet: Before adjusting air/fuel mixture as per instructions, I connected my timing light for the tachometer. Revved engine and set at 2000 rpm stayed pretty steady. On the front of carb, I turned the high speed main jet adjuster in (right) and the rpms started dropping to about 1980 rpms, I started backing up, turning out slowly, rpms started raising slowly 2020 was jumping between 2010, 2020, 2030. Kept backing up and rpms kept rising jumping about a bit 2050, 2060 until I reached a maximum of about 2080 or 2090 rpms and didn't see any more changes so I left it there. Next I hooked up my vacuum gauge to adjust air/fuel mixture. Started at about 21 lbs. of vacuum I adjusted in and out and looks like it was set pretty good from factory, stayed at around 21 and idled just beautifully. I was at 600 rpms idle and backed it down to 500 rpms, and was purring like a kitten. I revved the engine and it sounded allot throatier than before the fast idle adjusting. Now to put the air cleaner on and fill the tank to see what kind of gas mileage I get. Performance will have to be by my judgment. I was very content with the Rochester's performance but am excited to see what kind of performance I get now. We'll have to see how the UN2 does.
