Hi Erik,

There are 2 ways I use to search out leaks.

First is to clean the outside of the engine, take off the exhaust and blank out the ports in the barrel, put both pistons at mid stroke then fill the engine with petrol from the carb or plug holes, and it will seep out of any leak points.

The other way is to spray the running engine with soapy water and it will blow bubbles at any leak points.

Cheers,
Rich