Im no perfect tuner, but, by reading the bibles as well as listening to pro racers, I have learned and still learning about the way engines operate. Its hard for people to GUESS whats wrong with an engine. And I myself honestly dont want someone I dont know to GUESS when it comes to a 200 engine. Thats why I said read the bible. it should really help you understand the reactions of the rc which will help you determine how to tune. IMO