The engine runs fantastic after I tightened all of the loose screws that held all of the moving parts there were 4 or 5 loose now I love it
The engine is made to pull a lot of cars and it does but you have to watch so all of the parts are oiled and all of the screws tight there were about 4 or 5 screws loose that caused the gears to slip and not being able to turn the wheels so the gears would slip tighten them up and you have a FANTASTIC engine that runs and pulls FANTASTICLY