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Is this a cylinder leak-down test? Or do I pressurize the crankcase somehow and do a leak-down test on that?

I bought a 2009 Superjet (701) new from a dealer and have ridden it regularly (maybe 20-25 hours per season) for 15 years. I've done a little ocean riding but always rinsed it well. Always used good quality oil and run 40 or 45-to-1. I was planning to do a ring replacement this winter thinking...