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Is it definitely oil and not coolant? I think it looks like coolant. Check all hose clamps for starters. Do you know what colour coolant is used in the bike? I dont yet! Most cars these days have a pink coloured coolant,if it is a coolant leak and the same spec as used in cars then it usually leaves a tell tale residue when it dries up,almost like a dye. Let me know what you find. I had a loose clip on the breather pipe in the middle of the V of the engine and that leaked a small amount of oil,but your leak there is at the front of the engine way away from that hose,but do check that though,assuming it is oil. It should have a sweet taste if coolant too,check a little dab. Take it easy.