There is one reason I give average: Because I have this engine from before the nineties, and at that time, the spark plugs were lights that glow, and there was an electric engine to make it work automaticly... This was a downgrade of the original one... and Renwall made this, together with the visible chassis... From all the models I have built, this is the only one I recomend not to build. Not because its hard, not because its difficult to match everything, but because It is cheating to sell it donwgraded it... get an older edition one, with the sparkplugs and the electric motor.