• 1985 Honda 125 Fourtrax

Related Honda TRX125 Searches: VALVE CLEARANCE Inspect and adjust valve clearance while the engine is cold and the piston positioned at Top Dead Center (TDC) on compression stroke. Remove the seat. Remove body panels and fuel tank as necessary to gain access to valve cover. Remove the spark plug high tension lead and remove the spark plug.

CAUTION: Place a clean shop towel into the spark plug cavity to prevent dirt from entering. Remove plastic valve plugs. Remove timing inspection plug from recoil housing. CAUTION: Failure to position the crankshaft at TDC on compression stroke will result in improper valve adjustment. Rotate engine slowly with recoil rope, watching the intake valve(s) open and close. NOTE: Observe the intake valve closing and then start to open, continue to rotate until the “T” aligns with pointer.

The camshaft lobes should be pointing downward. Verify accurate TDC positioning by observing the “T” mark aligned with the pointer in the timing inspection hole. In this position there should be clearance on all valves. INTAKE VALVE CLEARANCE ADJUSTMENT 1. Insert a.006″ (.15mm) feeler gauge between end of intake valve stem and clearance adjuster screw. Using Valve/Clutch Adjuster (PA-44689), loosen adjuster lock nut and turn adjusting knob until there is a slight drag on the feeler gauge.

Hold adjuster screw and tighten adjuster lock nut securely. Re-check the valve clearance. Repeat adjustment procedure if necessary until clearance is correct with locknut secured. EXHAUST VALVE CLEARANCE ADJUSTMENT NOTE: The exhaust valve is adjusted thesame as the intake valve. Insert.006″ feeler gauge between end of exhaust valve stem and adjuster screw. Loosen locknut and turn adjuster screw until there is a slight drag on feeler gauge. When clearance is correct, hold adjuster screw and tighten locknut securely 4.

Re-check the valve clearance. Repeat adjustment procedure if necessary until clearance is correct with locknut secured. Inspect o-rings on the plastic valve plugs, replace if damaged. Securely fasten valve plugs.

Reinstall fuel tank and any body panels that were removed to gain access. EXHAUST VALVE CLEARANCE: 0.006±0.0008I (0.15±0.02 mm) BTDC on compression.

1985 Honda 125 Fourtrax

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