McCulloch MAC 3516 acting up when warm

[jammy]

My MAC 3516 starts relatively easy, but once it has warmed up, it acts up. It hesitates and/or dies out if I apply full throttle. If I keep the throttle at half, it will run fine for a while until it gets hot, then stalls out. Impossible to start when hot; has to cool down.

The L and H screws have stops that link to each other so I can only turn about a quarter turn each.

Is it running too rich or lean? What adjustments should I make? Do I need to clean out the carb? Help!!! Thanks.

 

[Bob Hedgecutter]

Could possibly be nothing to do with fuel and be an electrical problem.
Coil could be breaking down, working at low temperatures and loosing electrical contact when heated.