Step 14. Break-in Procedures
To begin break in procedures for you’re new engine simply idle 3 tanks of fuel allowing the engine to cool down completely between tanks. On the 4th and 5th tank start driving the truck around slowly. On the 6th tank start leaning it out and making final tuning adjustments. After the engine is broken in, good starting carburetor settings are:
Top End: 3 ½ turns out.
Bottom End: 1 ½ turns in from flush.