Craftsman wheeled weed trimmer 917.773740

so a friend borrowed my wacker ... mentioned it was running sluggish so she had tweaked it to speed it up... I guess she then proceeded to wack away and something bad happened. when she finally brought it back it would not run, she said she had had it cked and mentioned valve problem ... I took it in for repair and sure enough low compression. So I am out a weed wacker as it wouldn't be cost effective to repair. I notice she apparently had trouble with the mow ball as there had been an adapter put on the shaft. I use my operator manuals and heed warnings ... manual states engine speed factory set do not make adjustments and DO NOT tamper with governor (special tool needed) ...

so, here is my question ................... if adjustment had been made to speed up the engine and weeds got wrapped around mow ball shaft to mess it up could the torque have caused too much pressure and mess up the values??