I have a question on Novarossi P5. I am in the process of breaking in a new one. The engine is smooth on idle and generally makes good impression except for bering bump box killer.. It needs now to be preheated to min 90 C to get turnover... Yesterday, I dismantled it to examine how the break in process was going on. The piston/sleeve both are a mirrow, however there are several hairlines and a couple of more serious dings on the backplate and conrod.



I am quite technically literate but do not have much experience in nitro engines, however my idea is that rubbing the concord against the backplate might be something wrong as the aluminium powder might be pumped into combustion chamber causing premature wear of the working surfaces of the piston/sleeve..

Please let me know how yr backplate/conrod looked like after the break in especially on Novarossi. Other comments on what might be wrong and how to correct it are welcome!