Oil Circuit - KTM 400-660 LC4 1998-2005 Repair Manual

2-4E

Oil circuit

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The oil pump pumps the engine oil past the by-pass valve through the oil filter . After the oil filter, an oil lead branches
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off to a jet which sprays engine oil onto the piston pin bearing and piston head. The second oil lead takes the main flow of oil
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to the microfilter , which filters out even the finest impurities. The cleaned engine oil is pumped through the oil lead and the
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clutch cover into the crankshaft to the connecting rod bearing and drips into the crankcase. An additional oil pump sucks
the engine oil out of the crankcase and pumps it through the oil line 8 to the gear wheels of the 4th and 5th gear. Via the gear
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wheels, the engine oil reaches the oil sump. The timing chain runs through the oil sump and transports the engine oil upwards
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to the cylinder head. Through the bore the oil reaches the camshaft and the valves.
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