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Probably has some baked in mud/crud/crap. Is there a drain hole on the bottom of the riser anywhere? I used to need to rod out the one on my old 165 Mercruiser every season. Might be able to get in there with a length of wire and do some probing/flushing.It also looks like the port exhaust riser has a restriction as it is running much hotter then the starboard and steams after a hard run..
Looking good! Hopefully I'll run into you on Quinsig sometime this year.