SG250 Owner’s and Service Manual
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When the oil strainer cap is removed, there will be a spring
inside of it, as shown below.
Usually, the oil strainer remains in the engine when the oil
strainer cap and spring are removed. You’ll have to reach
into the engine with a pick or a screwdriver to get the oil
strainer out of the engine.
When you remove the oil strainer for the first couple of oil
changes (as the engine is breaking in), you will see more
than a few metallic particles and plastic adhesive material
(the green stuff) on the strainer. This is normal.
Clean the strainer. WD-40 works well, because you can
direct the spray into the strainer from the inside and blow
the filtered particles off. If you wipe them off with a shop
rag, take care not to deform the strainer.
After all of the oil has drained from the crankcase, insert the
cleaned strainer into the spring/cap assembly, as you
see below.
Reinstall the strainer, the spring, and the strainer cap.
Reinstall the oil drain plug.