i bought one last year,had the same problem,amongst others.what i did was leaned out the high speed about 1/8 of a turn and it helped.new motors are quite finicky,gotta play with them until they are fully broken in.when they do run well,they are a blast.great handling boat.i liked mine so much i bought another one.cant wait til it warms up here,still too cold to run them.good luck with it.