CGR, great detailed How To.

With out a doubt, the throttle is the most difficult of all controls to get setup right for all the reasons pointed out above. As you point out, there is no "Easy Button" from the commercials when it comes to setting up the throttle. I fell into the trap of doing the mechanics with the " That looks about right, the computer will fix the rest" train of though. Iwas always Tweaking the computer trying to get it to idle, shut off and get full throttle around full stick. Even with a good mechanical setup, the throttle can be a bit troublesome. However with a good mechanical setup, the computer can work it's magic with end points and expo to give a near linear engine to stick response.

You have to do what CGR said first though or you are just chasing your tail.

Don


Edit Added

I though I should point out that the linkage must not impart any side to side motion on the barrel of the Carb. The barrels are spring loaded with a not very stiff spring. You can push on the throttle arm end of the barrel and get some side to side movement due to the spring and the slop in the spiral grove in the barrel. On some carbs, this end play can be the equivalent of almost a full turn on the Idle mix. This can cause you some interesting problems on the idle and transition. Make sure your linkage is not introducing side play in the barrel. IEthe push rod is is pushing parallel to the crank CL.

Don