Leak is a leak. Just tighten the screws on the head, once you do that it will be fine, careful not to over do it. On Rossi's you will need to shim it if your nitro content is high. My Rossi 53 was running fine on 5% nitro then I went to the field with 15%, brought the wrong jug. It would not tune at all with the 15%. That's Rossi for you but they are lovely engines.