Small Engines (Lawn Mowers, etc.): stihl hedge trimmers hs 45, piston rings, c case

Question
cant keep my hedge trimmers running unless i close choke about half way then they only run for a little bit then ccut off. have to choke them to get started again wont run with choke in normal position

Answer
hi mike

sounds like the carby needs rekiting with repair kit  and fuel lines and f/filter need replacing
provided  
1  ex is not blocked,   no exhaust out  no fuel in
2  compression is good , no damage to piston / rings / cylinder  
3  spark is good loaded and un loaded-  physically  check  
4, c/case has not leaks  ie  @ barrell mount bolt, c/case seals , manifold block or boot
needs c/case vacuum / presure to operate carb and pump mixture to cylinder

5  flywheel timming key is not sheared / broken

if all these are ok  

carb repair kit and fuel lines and filter may be all that is required  


cheers  paul