Free calculator

Quick Carb

Calculate jetting direction fast without adding a machine.
Inputs
Main jet
Pilot jet
Needle clip
3
Air screw
Baseline weather
Temp F
Humidity %
Altitude ft
Current weather
Temp F
Humidity %
Altitude ft
Quick result
Air density is down 6%, so leaner jetting is usually safer.
Baseline DA: 1340 ft DA
Current DA: 10250 ft DA
Main jet
168 -> 160
Go 4 sizes leaner
Pilot jet
42 -> 40
Go 2 sizes leaner
Needle clip
3 -> 2
Move 1 clip position leaner
Air screw
1.5 -> 1
Turn 0.5 turns in
Manual stateless estimate from the values you entered. Verify the result before applying it; sign in only when you want Pro Carb Setup memory.