Tillotson HW-31A

RRP (Recommended Retail Price)

Carburettor Settings:
L: 1 turn 15 minutes
H: 0 Turns 40 Minutes
Pop off range: 0.75 bar hold pressure; Break Pressure 1 bar

*For optimum performance on a tuned engine, you can try different settings. Adjust first the High needle in 1 minute increments until you are happy with its setting, then adjust the Low needle also in 1 minute increments, then confirm the High setting by turning the High needle back in and out 1-2 minutes to confirm. Confirm/readjust the Low needle setting if you use a different High setting in the readjustment. You should not need to adjust more than 10 minutes in normal conditions, but more in extreme conditions like hot or rainy weather).

*Standard inlet tension spring: 26g (Part number 24b323). You can change the tension spring to increase/decrease pop-off pressure.

*The internal inlet lever arm should be set level with the carb body or fractionally above.

Repair Kit and Diaphragm Gasket for the carburetor: RK 7 HW and DG 1 HW