Y yasin0026 New Member Sep 16, 2011 20 0 0 turkey Sep 17, 2011 #1 After I put renewed my bike back to burst upon the engine sound of the engine speed dropped narrowed to 40 mph to 32 mph but the engine power dropped to the same speed, I wonder why the sound narrowed? Last edited: Sep 17, 2011
After I put renewed my bike back to burst upon the engine sound of the engine speed dropped narrowed to 40 mph to 32 mph but the engine power dropped to the same speed, I wonder why the sound narrowed?