Joyner JNSZ1600QL, Owner'S Manual

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(4). Mail measuring orifice blocked Check and clean mail measuring orifice
(5). Idle cut-off valve damaged and not open Check circuit and solenoid
(6). Idle speed too low Adjust engine idle speed
(7). Idle speed fuel outlet port or transition port blocked Check and clean
7.Rough engine idle speed
Cause Correction
(1). Air filter core blocked Clean or replace
(2). Vacuum leakage in Intake manifold or relevant hose Check and service
(3). Spark plug corroded, damaged or
Spark plug gap not correct Replace spark plug
(4). Hydraulic valve lifting rod damaged Replace the lifting rod
(5). Idle speed fuel outlet port or transition port blocked Check and clean
(6). Fast idling adjustment not correct Check fast idling spring for fallout,
readjustment.
(7). Low or unstable Cylinder compression pressure Check and service
(8). Timing belt tightening incorrectly Adjust timing belt tension
(9). Idle mixture too rich or lean Adjust carburetor idle mixture
adjustment screw
8. Engine Stalls during idling:
Cause Correction
(1). Low idle speed Adjust idle speed
(2). Fuel outlet port or transition port for Idle speed blocked Check and clean
(3). Choke not open or out of work Check choke system
(4). Carburetor float position not proper Check carburetor float or needle valve
(5). Spark plug corroded, damaged or Spark plug gap not right. Replace spark plug
(6). High tension wire damaged Replace high tension wire
(7). Ignition timing not correct Adjust ignition timing
(8). Hydraulic valve lifter damaged Replace Hydraulic valve lifting rod
(9). Low or unstable cylinder compression pressure Check and service