John Deere 420 Engine


John Deere 420 lawn tractor photo
1983 - 1991
400 Series
Garden tractor
Series map:
420
430
20.0hp
20.0hp
Engine Detail
Onan B48G
gasoline
2-cylinder
air-cooled horizontal-shaft opposed-twin
The B48G was the original engine on the Deere 420, used through the 1986 model year.
Displacement781 cc
47.7 ci
Bore/Stroke3.25x2.875 inches
83 x 73 mm
Power20 hp
14.9 kW
Air cleanerfoam and paper
Compression7.0:1
Rated RPM3500
Idle RPM1000-3450
Starter volts12
Engine Oil
420 gasoline engine oil chart
Oil capacity1.75 qts
1.7 L
Engine Detail
Onan P220G
gasoline
2-cylinder
air-cooled horizontal-shaft opposed-twin
The P220G replaced the B48G in the John Deere 420 during the 1987 model year, starting at tractor serial number 420001.
Displacement781 cc
47.7 ci
Bore/Stroke3.2580x2.875 inches
83 x 73 mm
Power20 hp
14.9 kW
Rated RPM3600
Starter volts12
Oil capacity1.75 qts
1.7 L
SparkplugNGK BPR5EFS
 Champion RS14YC
John Deere 420 Engine
John Deere 420 engine image
Image courtesy of Terry Russell
Page information
Contact: Peter Easterlund
Updated on June 23, 2022
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