have an berg-99.its misfiring on higer rews like half on the trottle and more.it sounds like ignitions problems.how to locate the problem. it runs ok on lower rpms and starts easy :roll:
first :have you replaced the spark plug if not do so .
secondly: try replacing the ignition lead
third ull carby apart and clean very well take jets out excetera run fine wire through all the jets
forth ull magneto cover off and make sure it is clean and dry inside
I change sparkplug,clean the carburator wery careful,there is no dirt or moisture in the magneto.i try to change ignition cable. 8) i say thanks wey much walle
yes, change the ignition cable and have a look to the little screw
at the ignition coil. Maybe there lays your problem.
Or the iginition coil is damaged. Electronical misfunction.