Possible antifreeze leak?

[Fazerjon]

i was just stripping my exup valve down and copper slipping it when I noticed a small drip of green antifreeze under the generator cover on the left hand side of my he engine. I've checked all the hoses, the level in the reservoir was just above minimum. Am I right in thinking there should only be oil in the left hand cover? I looked over the whole engine but cannot see any sign of a leak? It's a 2003 fazer 1000 with only 6500 miles on the clock.