1. GENERAL INFORMATION K-PIPE 50 POOR PERFORMANCE (AT HIGH SPEED) Inspection/Adjustment Symptom Probable Cause Check ignition timing Faulty CDI unit Correct Incorrect Faulty pulser coil Check valve clearance Improperly adjusted valve clearance Correct Incorrect Worn valve seat Check fuel filter for fuel supply Empty fuel tank Fuel flows freely Fuel flow restricted Clogged fuel filter or tube Clogged fuel tank cap breather hole Check carburetor for Cracked fuel pump vacuum tube clogged jets Not clogged Clogged Clean and unclog Check valve timing Correct Incorrect Cam timing gear aligning marks not aligned Check valve spring tension Not weakened Weak spring Faulty spring 1-20