A few weeks ago I asked for info on my 4.2. I asked, what RPM's should I look for swinging a Mejlik 24x10. I got one reply stating I should look for 6800 to 7200 RPM's. WELL I started the 4.2 today I bought it used I'm not sure if it is broken in. It started easily and after some needle adjustments I was only able to get 6540 RPM's. At this RPM the engine sounded like a monster like it wanted to rip itself off the firewall, the prop tip speed was ripping. I was holding this weeks solution by the stab, the pull was incredible, I cannot imagine this engine turning 6800 let alone 7200. Any reply on this would be appreciated