Honda GXV140 hard to turn with plug out and brake off

Dunk

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  • / Honda GXV140 hard to turn with plug out and brake off
Hi I'm really stumped with this one.
Engine seemed to be running fine. Took it off to put it on different mower.
When I went to start it it would not turn. Took plug out and checked brake was disengaged.
still needs a spanner to turn shaft. I can see piston moving and valves also move normally.
I really didn't want to take the engine apart as it seemed to be running so well.
Details Honda GXV140. GJAB-8054370.
Any ideas what could be wrong or what i should check?
Many thanks for your time.
 
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