I fixed the leak in my pull start tree farmer was right it was the seal. Now there is another leak that is coming out of air fins where the cylinder is located in. Where that piece is put together is where it is leaking is that possible to fix without taking the engine out.

 

I have an ATC 200 and I think I might have had the same problem and if it is it is you gaskets they probley need to be replaced becouse thats what I had to do to mine the gasket set will cost you around $20.00 to about $25.00 that is the whole set it would be smart to replace all of them it is really easey to do all you really need is a torque wrench and you probley will need to replace the spark plug! Good Luck!