Coolant in cylinder?

lundi 30 janvier 2017

I got a 2000 Polaris classic 500 that just got a full rebuild done by a friend. I put maybe 20 miles on it so far. I just went to change the plugs out and noticed one piston and plug looks normal for running mix in the tank. The other piston has a milky film on it along with the plug. Coolant leak issue? Base gasket? Any ideas.

Thanks