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In this video we will try to explain in a very summarized way some points to take into account and consequences when wanting to manipulate, regulate the rpm, idle in some YAMAHA motorcycles such as the XTZ250 - FZN25- FZ S among others that have this air passage screw in the throttle body. These are just some consequences of manipulating this screw: 1. The RPM or engine revolutions change 2. Affects polluting emissions CO, HC - O2 3. Directly affects performance or fuel use (CO2) 4. Affects the electrical charging system (battery) 5. Can cause excess temperature or overheating in the engine (lean mixture) 6. Can directly affect the engine oil (lean mixture or rich mixture) For this reason it is important to perform these procedures in a technical way, using the indicated equipment and that the technician is trained to interpret all the data and behaviors of the vehicle and thus be able to give a correct tune-up. Motopro Fuelinyeccion is located in the municipality of Villamaría - Department of Caldas, Colombia. Make your appointment.