Current owner was under the boat this weekend (with scuba gear) to switch props. Think he would have seen a crab pot if one was present. In this area (Chesapeake Bay) you have to be real careful, or you will end up with one.

Will check the mixing elbow and water trap. Will also (carefully) check the air inlet. Wasps have been known to take up residence there.

One other bit of information, the engine has about 100 run hours since rebuild, most running well, so it is unlikely to be a bad assembly issue.