Onan NHC Series Operator's/Service Manual And Parts Catalog page 151

Piston Ring Gap in Cylinder 0.010 0-020
Piston Ring Side Clearance (Top compression ring only) n oon
Breaker Point Gap (Full Separation) • • • " - " ^
Spark Plug Gap - For Gasoline Fuel . • • •
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Crankshaft Main Bearing Journal - Standard Size l.WW 2 0040
Main Bearing Diameter" . y y v '
Main Bearing Clearance • • • « • • , ,
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Crankshaft Rod Bearing Journal - Standard Size • • 1 - ° ^
Cylinder Bore - Standard Size i . M S J.aooo
* Set exhaust valve at .014 for. gaseous fuel operation.