As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RUBBER IN THE ADEL CLAMP DETERIORATED UNTIL THE CLAMP WAS NO LONGER SECURE AROUND THE THROTTLE CONTROL CABLE. WITH NO RESISTANCE ON THE HOUSING AND THROTTLE MOVEMENT, THE CARBURETOR BUTTERFLY ENDED AT THE 1,500 RPM LOCATION. WITH ONLY PARTIAL POWER, THE AIRCRAFT LANDED IN LAKE MICHIGAN. NO INJURIES.