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How to adjust the valve to the moped

How to adjust the valve in a moped

Operating Instructions four-stroke moped recommend to adjust the gaps for achieving the first 1,000 kilometers, and then every 4000 km.

In addition, the need to carry out the adjustment with the appearance of abnormal noise in the engine after dismantling the cylinder head or replacing the timing chain.

You will need

  • - Set schupov-
  • - A set of spanners and socket golovok-
  • - Pliers and pipe wrench.



Completely cool the engine. If the valve clearance adjustment is carried out after the repair of the engine of the slide valves on the removed engine. In engines with timing type SOHC clearances are governed by screws located at the ends of the rocker arms.


Unscrew the cap nuts from the motorskuternogo type or threaded hatch in the cylinder head of the engine and gearbox. The valves are set at the position of the top dead center end of the compression stroke. To get this special mark on the sprocket and the timing chain on the cylinder head.


Turning the crankshaft of the power unit,aligning these labels. Crankshaft rotate tubular key, put on the generator rotor nut. To get to this big nut with a screwdriver, unscrew the plug on the generator cover (on the moped engines) or disassemble the fan housing (skuternyh on motors). Pre unscrew the spark plug.


Rotate the crankshaft to complete alignmentTiming marks on the cylinder head and on the sprocket. Check the correctness of the valves in the position of the top dead center. For this crankshaft rocking sideways. At the same time the rocker valves must remain stationary and have a small gap (free running). Flat probes set the exact magnitude of thermal backlashes.


alternately Insert probes of different thickness in the gapbetween the valve end and the adjustment screw mounted on the yoke. If necessary, bend the probes. If the probe is part of the gap with a little effort, and the next in size probe into this gap is not included, read the value of the gap equal to the thickness of the first probe. In most engines of 50 cubic meters. cm clearance should be 0.05 mm, if other information is not covered by the operating instructions.


To change the size of the gap holding headscrew wrench or pliers. At the same time loosen the locknut. By inserting a probe into the gap desired, rotate the adjusting screw to pinch a weak probe. Then hold the probe in place, tighten the lock nut. Adjusting screw with lock pliers or a wrench of bias.


After that, be sure to check up correctness of installation of a thermal backlash. In reverse order of install all previously removed parts.

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