But there are some practical considerations when using a pipe...

I run the engine open exhaust to get a base-line RPM reading before putting the pipe on. I find it helpful to know what the engine was turning without the pipe, so I may know how much gain I am getting with the pipe, as well as where to stop when getting the pipe set.

So if I am running the engine at a fairly good clip with open exhaust, I am running my engine in.

Then I mount the pipe and set it....this takes a few more runs, and the engine will cool down in between runs....just like breaking one in, no??

As for Deadmeat and the Rossi...these are the easiest engines to break in IMHO...fire it up, get it running WFO, back off a few clicks, let it run, shut it down, repeat. Then mount it up and fly.

I've done this with every Rossi I have ever run, modified or not, and have never shelled one. They have very large con-rods, and the cylinder/piston are about as bullet-proof as possible.

Take this post with a grain of salt (or a cold beer), I'm not trying to tell anybody that they have to do it this way, but it has worked for me. YMMV