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Engine valves need adjusting.
symptoms: starts ok, runs until engine reaches max temp loses power then stops. can't restart when hot. once restarted runs for a while stops again.
There is very little clerance in these valves and temperature alters the lenth by a few thou and the valve don't close fully losing compression, once cold the valves shrink back enough to create enough compression to start again.
You need to remove the rocker arm cover. Then most engines have a set screw and a locking nut that hold the valve rocker arm on. Loosen the locking nut and with a feeler gage make whatever adjustment you need (tighten or loosen) then holding the adjusting screw from turning, tighten the lock nut. It is not very hard to do and remember that they are all metric fasteners.
Check solenoid on the back of carb! I just had a similar issue with the same motor, would start rite up but had no power! new fuel pump coils, plugs ect I found the ground wire going to the coils were zip tied to manifold and rubbed through on the underside of wire never saw it 2 days later ripped it apart again and bingo found it taped it fixed problem.
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