wr 400 engine oil

does anyone know how much oil to put in the engine and will silkolene fully synthetic 15w50 be alrite wr 400 1999 this is my first thumper always had 2 strokes

Total amount 1.7L, periodic change 1.5L, with oil filter replacement 1.6L. Put 10w 40 in mine today, but 15w50 should be ok.

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