Re: 63mm TB
The LT-5 has a progressive throttle with the small tb being used for idle and quite a bit of cruise. The IAC motor has its own opening to allow more air into the plenum. It does not move any throttle blade. Earlier Computer Controlled Carb setups would manipulate the throttle blades.
For any tuning, its critical to have all sensors properly operating and for mechanical adjustments to be within correct operating range.
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