1. GENERAL INFORMATION SUPER 9 50 ENGINE LACKS POWER Inspection/Adjustment Symptom Probable Cause Start engine and accelerate lightly for observation. Clogged air cleaner Engine speed Engine speed does Clogged fuel filter increases not increase Clogged exhaust muffler sufficiently Faulty auto bystarter Faulty charcoal canister Check ignition timing (using a timing light). Faulty CDI unit Correct timing Incorrect timing Faulty A.C. generator Test cylinder compression (using a compression gauge) Worn cylinder and piston Normal Abnormal rings compression compression Blown cylinder head gasket Faulty reed valve Check carburetor for clogging Not Clogged Clogged Clogged carburetor jets Remove spark plug and inspect Plug not fouled or Plug fouled or Fouled spark plug discolored discolored Incorrect heat range plug Check if engine overheats Mixture too lean Poor quality fuel Engine does not Engine overheats Excessive carbon build-up in overheats combustion chamber Ignition timing too early Rapidly accelerate or run at high speed Excessive carbon build-up in Engine does not combustion chamber Engine knocks Poor quality fuel knock Clutch slipping Mixture too lean 1-27