Montgomery Ward Twin 20 Engine


Montgomery Ward Twin 20 tractor photo
1975 - 1976
Garden tractor
Simplicity built
Engine Detail
Onan CCKB
gasoline
2-cylinder
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
Compression7:1
Rated RPM3600
Idle RPM1300-3850
Starterelectric
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 TractorData.com
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Peter Easterlund - owner/author
Email: Peter@TractorData.com
Updated on November 14, 2023
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