June 4, 20197 yr I'm sure my old man used to quote so many thou per inch of bore. Had a quick google and turned up similar on Wisecos website Quote Once the piston ring is located and squared up, measure the end gap using the feeler gage. A rule of thumb for ring end gap measurement is to use the bore size in inches x .005”. In the example here, a KTM150, the bore is 56mm (56 divided by 25.4 = 2.2047”). If you multiply 2.2047” x .005”, the result is .011”. This would be the minimum installed ring end gap. A typical high measurement for the piston ring end gap would be the bore in inches x .007” (2.2047 x .007” = .015”). These calculations are a general guideline, and your OEM service manual will also provide further detail. If anyone has a manual it might specify a certain value but the above would be a good starting point I would say.
June 4, 20197 yr Author Bore is 76 mm so Im getting a ring gap of 14 thou. Sounds about right. Thanks
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