Briggs & Stratton 30000 SERIES - Manual (Page 17)

17
7. While observing O2 Analyzer readout, adjust zero
pressure regulator [ZPR] (A) and main adjustment
screw [MAS] (B) to obtain stoichiometric value shown
in table below. Select table value that corresponds to
your O2 measurement system. Shaded table line is
target value.
8. Set generator’s main circuit breaker ON.
9. Apply full load to generator. Adjust MAS (B) to achieve
target value. Clockwise rotation of MAS will cause air-
fuel mixture to become more lean.
10. Set generator’s main circuit breaker OFF (no load).
Adjust ZPR (A) to achieve target value. Clockwise
rotation of ZPR will cause mixture to become more
rich. Make sure ZPR tower cap is reinstalled prior to
final reading.
11. Set generator’s main circuit breaker ON (resume full
load). Reverify sensor value remains in target area.
Adjust MAS (B) as necessary.
12. Set generator’s main circuit breaker OFF (no load).
Reverify sensor value remains in target area. Adjust
ZPR (A) as necessary.
13. Set the generator’s main circuit breaker OFF.
14. Push and hold the MANUAL OVER-RIDE button on
control panel. When the engine stops, allow it to cool
for a few minutes before proceeding.
15. Remove O2 sensor from exhaust manifold and reinstall
plug. Disconnect timing light from engine.
16. Complete emissions statement and send with
installation checklist.
A B
Voltage Phi Lamda
2.40 1.000 1.000
2.45 1.012 0.988
2.50 1.024 0.977
2.55 1.036 0.966
2.60 1.048 0.955
2.65 1.060 0.944
2.70 1.071 0.933