I have ran my keep off 4 for probably more than 5 or 6 gallons without ever opening up or maintaining, nor have I ever used after run oil. She still runs like a champ but compression getting a bit low so getting it resized. On every single novarossi I have had I never ever replaced a single rod nor bearings nor did i ever clean the internals, nor did I ever use after run oil. I have messed up proper break in, ran too lean at times ran over 310 degrees but the damn thing never dies. Its the most heavy duty reliable engines I have ever used. The only cons I feel is fuel mileage. Novas arent the best when it comes to fuel mileage. Not everyone drives like Drake. The quality of novarossi engines are true craftsmanship.

3 key things i make sure to do is front Buku cap, tightly fit air filter, and byrons fuel.