Have the engine serviced before you pull the first tube of the season. Just as your car's engine may bog down a bit when you tow your boat, your boat's engine bogs down when you pull a tube. Ensure the point of attachment for the tow rope, whether a ski pole, towing cleat or other attachment point, is well-attached to your boat. Test your boat's kill switch, if it's so equipped, and experiment with tow rope length. The tow rope should be at least 20 feet long, to keep riders out of the engine exhaust.