Hyundai 1 inch, Owner'S Manual

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3) Engine Oil Recommendations
Engine oil is a major factor affecting engine performance and service life. Non-
detergent and 2-stroke engine oils will damage the engine and are not
recommended.
The recommended oil is a 4-stroke petrol engine oil is SAE15W-40 or
equivalent to SG grade. The recommended operating temperature of this
pump is between -5 ⁰C and 40⁰C.
4) Air Filter Service
A dirty air filter will restrict air flow to the carburettor, reducing engine
performance. If you operate the water pump in particularly dusty areas, the air
filter will need to be cleaned more regularly than specified in the maintenance
schedule.
Never run the engine without the air filter or use a damaged air filter. This
will result in damage to the engine.
Screw off the butterfly nut and remove the housing. Screw off the next set of
butterfly nuts and remove the air filter.
1. Wash the foam air filter with a home detergent (or other non-flammable
or high flash-point cleansing solvents) and warm water and then dry it.
2. Soak it in clean engine oil until it has saturated and then squeeze out
excess oil.
3. Clean the lower body of the air filter, housing and rubber cushions. It is
important to prevent dust from entering into the path of the oil
carburettor.
4. Replace the air filter and screw on the butterfly nut.
*N.B. If fitted with a paper air filter, clean with a high pressure air jet.
5) Spark Plug Service
Recommended spark plugs: NGK BP6ES or equivalent