| Redesigned during production.
There are at least 2 different versions of instructions for this set. The differences for the second version are indicated in this inventory in the Alternate Items section with Match ID 99.
Quick overview of redesign: An additional pearl gold 4073 Plate, Round 1 x 1 and an additional tan 6541 Technic, Brick 1 x 1 with Hole are added to stabilize a gear that can slip off an axle under load when the engine is converted over to Power Functions. | 
inventoried this Set on Apr 17, 2009