From one Blue to another - congrats!
On the RPM's, 5300 sounds more like what it should be. I don't know about the merc 150's but the Yamaha 150 2-stroker should run somewhere b/t 5000 - 5500 WOT depending on prop.
Glad you are back on the water! I know the feeling well.
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1994 Wellcraft V21
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