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Crankshaft, piston and connecting rod
117
in. mm in. mm in. mm
Balance shaft bearing max. ID
(cylinder block)
78 N/A N/A N/A N/A N/A N/A
83 0.591 15.00 0.591 15.00 0.592 15.03
90 0.591 15.00 0.591 15.00 0.592 15.03
Compression ring to land max.
clearance
78 0.001 0.02 0.002 0.06 0.008 0.20
83 0.001 0.02 0.002 0.06 0.008 0.20
90 0.001 0.02 0.002 0.06 0.008 0.20
Scrapper ring to land max. clearance
78 0.001 0.02 0.002 0.06 0.008 0.20
83 0.001 0.02 0.002 0.06 0.008 0.20
90 0.001 0.02 0.002 0.06 0.008 0.20
Compression ring end gap
78 0.008 0.20 0.016 0.40 0.039 0.20
83 0.008 0.20 0.016 0.40 0.039 0.20
90 0.008 0.20 0.016 0.40 0.039 0.20
Scraper ring end gap
78 0.008 0.20 0.016 0.40 0.039 0.20
83 0.008 0.20 0.016 0.40 0.039 0.20
90 0.008 0.20 0.016 0.40 0.039 0.20
Specification New Min New Max Service Limit
For Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com