No the reason I asked is because I was reading the grid on the novarossi thread and I must of seen 10 people telling to check on this motor or that. I never messed with my vzb's or my bf21 or any motor Ive owned for that matter. I did check for pitting on the head and piston but never found any. You know I have a hard time just cleaning my RC's, adding fluids, ect. I dont need more to do. Was just wondering how they did it. I thought I saw someone say they squished a piece of sotter between head and piston and I thought that didnt sound like a good idea to me. I dont see the average RC dude having a depth gauge in the pit box, vernier maybe, but what to squish?