2013 250 pro xs ser# 2B012044. 859 hrs. Ranger 520c 25p fury (prop was on it since new)
last fall boat ran 73-75 fast forward to this spring boat will only run 68mph and rpm 5400-5500
compression 100psi on all six. All reeds are good no cracks. Air box gasket was replaced after inspection of reeds. Power head was pulled to check gasket (replaced gasket). Adaptor was checked and tuner also was checked. Gaskets where replaced after checking. Thought we seen a spun cylinder sleeve with a bore scope so heads where pulled and all six are good. Gaskets where replaced. Checked vst for a cracked grommet on high pressure pump it was ok. Checked small grommet on return line and it was ok. Pulled the tracker valve and it’s fine. Tried a new crank sensor today and it didn’t help. Motor has been too two different mercury mechanics and still not running right. So I turn to bbc for help.