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Another vote for solenoid going bad, it will stick "on" (plunger pulled in on solenoid so gears pushed out/engaged with flywheel) resulting in the situation you describe. There is also an outside chance that the actual shaft that your starter gear slides on might be gunked up, but usually that would result in a failure where the drive does not engage whereas yours won't disengage.
On my outboard (late 90s Mercury Offshore 125 2smoke) the starter solenoid died this way and I was able to locate an entire starter including solenoid for around $100, but you can buy the solenoid as a standalone item as well. Not rocket surgery to replace but do be sure to disconnect power (including from any sort of house battery/ACR system!) before you start spinning wrenches.
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Grant
In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 2011 Pursuit 315 OS, 2022 Tesla Y
Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S
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