Here I'll say it..... Nitro's require a whole different skill set for tuning and espically diagnosing problems.
I recomend nitros to teenagers and above that have someone to mentor them and be there mechanic, or to people that have a mechanical background and can self teach.
my learning curve cost me 3x piston and liner sets at around $70 a peice.... But I now I'm very confident in tuning and diogoising, since I have had 2 other nitros for a few years that were still running when I sold them