Re: Pre-purchase tests
Hmm...personally, I'd skip it. If the clutch cables are adjusted right, the dog clutches are fine, but, if they're out of whack a bit...good luck. In 1993 Volvo Penta bought OMC and their outdrives from 1993 on were the cone clutch style which are vastly improved and very reliable.
But if you're hell bent on checking it out anyway, a couple words of advise. Muffs and water tests. Be sure the engine starts easily when cold, warms up fine, doesn't over heat, shifts without problems. When on the water, keep an eye on the temperature guage. Go through the rpms, shut it off, restart it up, etc.
As for the outdrive, check the drive fluid, look for cracks in the skeg/lower and upper unit. Be sure the tilt/trim works freely, steering doesn't bind, etc. Ask the owner for receipts of winterization that should include lubing the ujoints and gimbal bearing plus changing the drive oil, checking the bellows for leaks, etc. If he doesn't have receipts, ask him where he serviced it and talk with the shops mechanic on the boat.
Good luck...!!