True auto carbs will suck the choke plate open and default to no choke if they are not tampered with to do otherwise, so I don't know what the issue is concerning choke malfunction. If the linkage to the choke breaks, the choke just doesn't work, because the auto maunfacturers make it so more of the plate is inboard of the pivot point than outboard. Manual linkage allows you to control how much while cold. By using a filtered air bleed, a simple air valve installed into the intake before it splits into the 4 individual runners will allow for leaning the mixture. Installing something similar to a drain cock from a radiator will allow gradual air bleeding or leaning of the mixture at pilots control. Most good auto carbs have internal mixture adjustment that don't require input from the pilot due to internal diaphrams and needles that adjust mixture according to the vacuum signal, in essence the airflow. In short a good auto carb don't need to be messed with. Run it as is!
Colin & Bev Rainey KR2(td) N96TA Sanford, FL crain...@cfl.rr.com http://kr-builder.org/Colin/index.html
