Gravely 424 Engine

Gravely 424 lawn tractor photo
1967 - 1972
400 Series
Garden tractor
Series map:
Engines overview
10HP Kohler 391cc 1-cyl gasoline
10HP Onan 491cc 1-cyl
Engine Detail
Kohler K241
air-cooled horizontal-shaft
Displacement391 cc
23.9 ci
Bore/Stroke2.87x3.25 inches
73 x 83 mm
Power (gross)10 hp
7.5 kW
Air cleanersingle dry element
Rated RPM3600
Starter volts12
SparkplugChampion H-10
Sparkplug gap0.025 inches
0.635 mm
Intake valve clearance0.009 inches (cold)
0.229 mm
Exhaust valve clearance0.018 inches (cold)
0.457 mm
Engine Oil
424 gasoline engine oil chart
Oil capacity2.5 qts
2.4 L
Engine Detail
Onan NB
Displacement491 cc
30 ci
Bore/Stroke3.5625x3.00 inches
90 x 76 mm
Power10 hp
7.5 kW
Rated RPM3600
Starter volts12
Page information
Peter Easterlund - owner of
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TractorData is a family-owned small business located in Minnesota that has been providing reference information on tractors since 1999.
Peter Easterlund - owner/author
Updated on August 4, 2021
©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.