Routine Maintenance
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Routine Maintenance
You can do daily maintenance easily by yourself. Engine performance will be improved by daily maintenance, and
engine life will be prolonged and overhaul cost will be reduced.
Replacing engine oil
1.Check engine oil and oil level before operation.
1) When checking engine oil, the machine shall be stopped and be placed on a horizontal plane. 
2) Loosen engine oil dipstick and wipe it clean. 
3)Insert engine oil dipstick into oil filler opening, but do not tighten it up. 

4) Check whether the oil level is between the upper scale and lower scale. If the engine oil level is too low, engine oil shall be filled to required oil level. 
5) Re-insert the oil dipstick and tighten it. 
2.Replacement of engine oil
To reach the desired effect, engine oil of your small engine shall be replaced after 25 hours or after one month after its first use, and it shall be replaced every 50 hours or every 3 months afterwards. 
1) Preheat the engine for 2-3 minutes and stop the engine. 
Warning: ensure that the sparking plug wire has been disconnected and keep it far away from sparking plug to prevent accidental starting. Clean around the oil filler opening and oil drain cock and prevent dirt and scrap to fall into crankcase
2) Place a can for oil under the engine.
3) Loosen and remove oil drain bolt and drain the engine oil. 
4) Pull the starter by hand for several times to help drain all the residual oil. 
5) Put back the oil drain bolt and tighten it. 

Engine Oil Recommendation
In order to get perfect engine operation, we suggest you to use quality engine oil. Usually SAE 10W-30 is recommended or you may choose engine oil with viscosity according to Oil Viscosity Chart and temperature in your area.  

Replacing air filter

If the filter element of the air filter is too dirty, air intake will be seriously affected and the power of the engine will be decreased and engine performance will be reduced.
Dismantle air filter housing to check the air filter, clean or replace dirty or damaged air filter element. If there is oil-bath air filter, check the oil level. 
Please clean the air filter every 50 hours and replace the foam and paper filter element on the air filter every 100 hours or every 6 months. 
  • 1
    Cleaning paper filter element 
    Please slightly tap the filter element on hard plane for several times to remove dust accumulated on it, and then blow from inside to outside with compressed air whose pressure is no more than 207KPa. Please replace the filter element in time if the filter element is too dirty or broken. 
  • 2
    Cleaning foam filter 
    The foam filter can be rinsed in hot water with detergent or can also be cleaned in non-inflammable or high-flash-point solvent; after it is dried, immerse it into clean engine oil, knead evenly and squeeze out engine oil in excess. 
  • 3
    Cleaning the oil-bath air filter
    Please replace the engine oil in time if it is too dirty. Evacuate the engine oil in the air filter; thoroughly clean the accumulated dust in the air filter with non-inflammable or high-flash-point solvent, dry the air filter box and pour into the same lubricating oil as gasoline engine until it reaches the oil level mark. 

Adjustment of valve clearance

Note: Unless the user has special maintenance tool and maintenance skills, the adjustment of valve clearance shall be maintained with the professional skilled workers.
The size of valve clearance has great impact on the performances of engine on all aspects: If the valve clearance is too small, the expanding of valve rod in thermal state of the engine may lead to valve leakage and power coast down or even burn out the valve; If the valve clearance is too big, there might be collisions between different transmission parts as well as between the valve and the valve seat, and meanwhile, the valve opening duration will be reduced and cause insufficiency of air intake and exhaust and will also directly affect the normal operation of engine. 
General speaking, valve clearance of gasoline engine must be checked and adjusted after it is used for 1 year or 300 hours. The valve clearance must be adjusted in cold state and when the valve is totally closed. Place the piston on the dead point of the cylinder combustion chamber, and the positive related position between flywheel magnetic steel and flame igniter is positive point. Insert the feeler in the clearance between the valve rocker and the valve and measure the clearance of the lifter. 
Valve clearance:
Intake valve: 0.10 ~0.15 mm
Exhaust valve: 0.15 ~0.20 mm


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