Handlebar shakes or excessively vibrates: Handling and/or Stability Unsatisfactory: O-ring at the oil pipe in the crankcase damaged Neutral positioning pin spring weak or brokenДrive shaft, output shaft, and/or gear splines wornД¬onnecting rod small end clearance excessiveД¬onnecting rod big end clearance excessiveД®xhaust pipe leaking at cylinder head connectionД¬lutch housing/friction plate clearance excessiveД«racket, nut, bolt, etc. Valve not seating properly (valve bent, worn, or carbon accumulation on the seating surface.)ДЇuel level in carburetor float bowl too lowДoesnвЂ™t go into gear shift pedal doesnвЂ™t return: Spark plug cap shorted or not in good contactД«leed holes of air bleed pipe or needle jet cloggedД¬ylinder head not.sufficiently tightened down

Piston ring bad (worn, weak, broken, or sticking) Spark Plug cap shorted or not in good contactДЄir cleaner clogged, poorly sealed, or missingДЇuel level in carburetor float bowl too high or too low Valve not seating properly (valve bent, worn, or carbon accumulation on the seating surface) Piston ring bad (worn, weak broken, or sticking) Neutral, starter lockout, or side stand switch troubleД¬ylinder head not sufficiently tightened down Spark plug cap or high tension wiring trouble (When flooded, crank the engine with the throttle fully open to allow more air to reach the engine.) Starter motor rotating but engine doesnвЂ™t turn over:ДЇuel level in carburetor float bowl too high Starter lockout or neutral switch trouble Also check out the Spark Plug Troubleshooting guide from our friends at NGK.Д®ngine DoesnвЂ™t Start, Starting Difficulty:

While this Motorcycle Troubleshooting Guide is not a complete guide of every possible cause for each problem listed, it will help assist mechanics in troubleshooting some of the most common difficulties they will face.

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