GY6 61mm Top End Test Gaskets - LOW GRADE

There is a lot of different engines out there some very very similar to the QMJ157. If you don’t know your engine type, and there is no stamps or way to identify it. Before purchasing our 172cc big bore kit, get these to verify. These are low-grade test gaskets, we would never use these for a build. We use these to ensure a direct fitment if you don’t know your engine type for our 61mm 172cc big bore kits. if these gaskets fit your engine, you do in fact have a QMJ157 engine and our 172cc drop in big bore kit will fit