The engine is easy enough to tune.My freind bought one as his first R/C and he tuned it with no problem.All I did was tell him what temps to keep it at and he did the rest himself.The whole buggy is kinda weak as far as buggies go.He has bent the chassis 3 times,went through 4 shock towers,2 sets of hub knuckles,and a set of brake discs.We solved the chassis issue by adding a Y brace from another Ultra type buggy and added a shock tower from an MBX R2.The shock tower and chassis are holding up nice but the axles and hub knuckles still bend after a hard day of bashing and we haven't found an altenative to those parts just yet.