Montgomery Ward Twin 20 Engine

Montgomery Ward Twin 20 lawn tractor photo
1975 - 1976
Garden tractor
Simplicity built
Engine Detail
air-cooled horizontal-shaft opposed-twin
Displacement816 cc
49.8 ci
Bore/Stroke3.25x3.00 inches
83 x 76 mm
Power (gross)19.9 hp
14.8 kW
Air cleanerpaper element
Rated RPM3600
Idle RPM1300-3850
Starter volts12
SparkplugChampion H-8
 Autolite AL5
Sparkplug gap0.025 inches
0.635 mm
Point gap0.020 inches
0.508 mm
Intake valve clearance0.007 inches (cold)
0.178 mm
Exhaust valve clearance0.016 inches (cold)
0.406 mm
Engine Oil
Twin 20 gasoline engine oil chart
Oil capacity4 qts
3.8 L
Oil change100 h
Page information
Peter Easterlund - owner of
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Peter Easterlund - owner/author
Updated on November 14, 2023
©2000-2023 -®. Notice: Every attempt is made to ensure the data listed is accurate. However, differences between sources, incomplete listings, errors, and data entry mistakes do occur. Consult official literature from the manufacturer before attempting any service or repair.