[QUOTE=GPXJOE;12926676]guys my nova flash pt has bubbles on top of the piston and in the combustion chamber on top of the piston. and the engine sound has a rattling noise that sounds as if there is something wrong with the engine. but the engine does not flameout and is running ok. what should i do?

change the bearings?how?[/QUOTE

Try to post some pics to pin point the problem .