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NOTE: Power Valve cable adjustment is critical to the operation and performance of your engine. If the APV cables are out of adjustment you will experience lower power levels as well as lower RPM's Make sure the power valves are installed correctly. Please read the section on Power Valves in this handbook. If the Power valves are installed upside down, the piston may come in contact with the exhaust valve and damage to the piston and cylinder will result! This will not be covered under warranty! It is the mechanic who is assembling the engine responsibility to make sure that the power valves fit correctly. Before assembling the cylinder to the engine, pre-assemble the power valve assembly and install into the cylinder. Then take a straight edge ruler and make sure you have a minimum of .020 to .030 clearance between the power valve and the straight line of the cylinder bore. If needed the mechanic can remove the power valves and grind on it with a die grinder to make sure there is enough clearance.