I would really like to understand the circumstances surrounding this issue. The engine would only be subject to warranty replacement if the components were deemed/proven to be faulty and outside of manufacturing tolerances. Also how can they be sure you fitted the replacement rod correctly with a new wrist pin and clips? There is a piece of paper in the box that states this and I believe is the same policy for all engine manufacturers.

That said, I personally have never had a conrod or bearing fail in any of the Novarossi's I've owned (The Novarossi 359 series engine being the exception however this had a peculiar small size crank pin which failed and was a known problem - NR quickly discontinued that engine!). I have seen Novarossi engines fail when people use poor quality fuel, run them overly lean or employ a poor break in technique (running in at too low temperature) which would be the case with any nitro engine!

Like I say I would be interested to hear the circumstances surrounding your issue as your post wasn't clear and would've been useful to post. I mean I've got a Keep Off 4 in my box as a wet engine that has over 7 gallons on it with the original rod and bearings (same rod P/N as Mito).