[Grady Clay]

Kevin,

The shims under the aneroid are Factory set to have the air pressure compenstion proper for the conditions at assembly. This allows the aneroid to operate corectly throught the range of atmospheric pressures and altitude. This is not something you normally ever adjust or change.

For a given engine (T-E-S and displacement) you first adjust the mixture with the 'main mixture adjustment' behind the Allen screw on the MFI pump. When the main mixture is close to correct you can then adjust the idle mixture. You must readjust the idle every time you adjust the main.


Where the idea comes from changing the shims under the aneroid is when dramatically changing the diplacement of an engine: for example from 2341 cc (2.4) to 2808 cc (2.8).

Best,
Grady