Originally Posted by dboyd351
Take your trimmer in to the dealer again and ask him to show you how to adjust the carb. If it isn't adjustable, ask him for one that is. Also mention your trimmer is still under warranty.
There is also the possibility a gas line is cracked or you have an air intake leak (i.e. carb intake missing a gasket, cracked, or isn't tightened sufficiently).
It more than likely has tamper proof caps installed over the adj. screws. If the dealer did
adj. the carb, then he is required by law to replace the tamper caps. The dealer cant legally show the consumer how to adj. the carb anyway!