If it were me, I'd just replace the LH crank seal (p/n 91202-357-003, still available from Honda) while the flywheel's off - you'll definitely have to do it eventually, might as well be now while it's easy. If you want to test the RH seal while the motor's on the bench, I'd suggest sealing up the clutch cover and spraying some soapy water around the seal where it meets the crank, then lightly pressurize the gearbox as you mentioned (3-5 psi should be fine, no real need to go higher IMO). It's kind of a backward test, but if you get bubbling at 3 psi the seal's definitely bad, and if it holds 60% or more of the original pressure for a couple of minutes or more w/no bubbling at all, the seal should be OK (depending on how many hours are on it, of course).
Ray
_________________ '74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric
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