my frenz has this BRB, fitting into Nova RB crankcase, use nova LL5 crankshaft, OS P6 turbo, with RB carb. ok, recently, he got his needle mixture mixed up, so our frenz help him to retune, we found that his LSN is only 1/2 turn, then he changed a new glow plug, ran for 1 round, and the plug blew off. so may i ask wats the problem here. previously it was ok for him, powerful engine, but now, i help him open up his engine, there is these vertical scratches on the piston. and turbo head is very slightly rough (meaning overheat i assume). so how can we help him out? thanks.