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Engine hunting, shotA. The air inlet system: ① if air filter elements clean or not; ② if it is loosened between these spare parts: air filter, carburetor,insulation board and their gasket; B. The oil level; C. If the tensioner spring,including the governor spring and idle spring, work or not; D. If the exhaust vent of silencer be blocked or not; E. If governor lever, throttle linkage and other related parts be blocked or not; F. Test again after change a new carburetor. |