Well a 800 RPM gain is good... I would say! My Friend has a 1.20 Webra, called a Bully. It has twin Glow plugs. He has 2 or 3 Webra 1.2 engines. I put a Frank Bowman piston ring in it and what a difference that made. The compression is way better than his other Webras! It will flip start now...it has very good compression with that ring. Best Regards Capt,n