BS Series 550EX engine valves

KF · Mar 30, 2022

I have a Briggs and Stratton Series 550Ex, 140cc lawnmower engine. It was made in 2014 and is Model No. 09P702-0144-F1. Does anyone know the valve clearances for this engine?

wore out · Mar 30, 2022

Gap is 0.004-0.006 for both valves.

Remove the spark plug. Turn the flywheel until the piston is at Top Dead Center (TDC) on the compression stroke. Continue to turn the flywheel until the piston drops down 1/4. Set the valves.

Rodney51Cub · Mar 30, 2022

Model Series 09P7
Power Lbs/Ft of Torque 5.5
Engine Series 550
Displacement 140
Oil Capacity 16 oz (0.5 l)
Valve Configuration OHV
Flywheel Torque 60 lb/ft (81.5 Nm)
Governor Arm Torque 30 lb/in (3.5 Nm)
Plug Gap 0.020 in (0.50 mm)
Intake Valve .004-.008 in (.10-.20 mm)
Exhaust Valve .004-.008 in (.10-.20 mm)
Idle Speed 1750
Air Gap .006-.014 in (.15-.36 mm)
Connecting Rod Torque 100 lb/in (11.5 Nm)
Sump Torque 85 lb/in (9.5 Nm)
Head Torque 140 lb/in (16.0 Nm)
Top No Load (rpms) 3200 +/- 0100 RPM - No Load

KF · Mar 31, 2022

Many thanks for the information on that engine.

BS Series 550EX engine valves

KF

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wore out

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Rodney51Cub

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KF

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