I have the EXACT same problem with my 95 130 Yamaha! Runs fine in water but on muffs the alarm goes off after a few minutes. I put a bungie around the muffs to tighten them up and better seal around the intake but basically I dont run it long and dont rev it.
Had a mechanic say this is typical with Yamahas, too much water leaks out where as it doesnt in water or a barrel.
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Until last year I never had issues on muffs. Run (Mercs/JohnRudes) until the thermostat opens and consider the flush complete. That said my new to me Yami 130 2 stroke (first yami for me) will not run on muffs. It runs, a few min pass, and the overheat alarm goes off. After replacing 100% of all cooling related parts the solution was....you need to run it in a barrel  . For some reason on muffs the bypass wont open allowing water to heads. The one upside to this is my neighbors and I learned how much more quite running in a barrel is  . This year I make a dedicated flush tank.
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