MasterCraft 2007 X-Series User Manual

2007 MasterCraft Owners Manual - Page 10-3
If the WOT RPM is lower than the minimum RPM in your engine’s WOT operating range, the boat is over-
propped. Installing a lower-pitched propeller will increase WOT RPMs.
An engine that is under-revving is “lugging.” This places a tremendous load on the pistons, crankshaft and
bearings and can cause detonation, piston seizure and other engine damage.
Elevation and weather also have a very noticeable effect on the wide-open-throttle power of an engine. Since
oxygen gets thinner as elevation increases, the engine begins to starve for air. Humidity, barometric pressure and tem-
perature have a noticeable effect on the density of air since heat and humidity thin the air.
This phenomenon can become particularly apparent when an engine is propped out on a cool, dry day in
spring and later, on a hot, humid day in summer, and does not have the same performance. Although some perfor-
mance can be regained by dropping to a lower-pitch propeller, the basic condition still exists. The propeller is too large
in diameter for the reduced power output. An experienced marine dealer can determine how much diameter to remove
from a lower-pitch propeller for specifi c high-elevation locations.
MasterCraft’s engine manufacturers suggest that consumers consult with the dealer from whom you purchased
your boat regarding the best propeller for the application in which you expect to run your boat. However, you
should be aware that changing your propeller may void your warranty. Again, working with your
dealer is your best bet to ensure excellent performance.
Unusual Operating Conditions
If the body of water is unknown, talk to the local boaters about the type of obstacles you may encounter be-
neath the water’s surface. Rocks, tree stumps and sandbars are all dangerous and damaging. Be especially wary of
rivers and man-made lakes. Rapidly changing conditions can cause daily changes in underwater hazards.
Stay well clear of fl oating debris. What looks to be a small branch in the water may well turn out to be an
entire tree.
When traveling through weedy areas, keep an eye on the engine temperature gauge. Weeds caught up and
blocking the water fl ow through the raw water intake or transmission cooler will cause trouble. Also, after leaving the
weedy area, shift to neutral for a few seconds and then to reverse for a few seconds to unwind any weeds that may
have wrapped around the propeller.
Docking and Tie-Up
Approach the docks slowly, with the
starboard side of the boat if possible. The nat-
ural tendency to torque steer with the rotation
of the propeller at slow speeds makes docking
easier on that side. Also, use wind and current
to your advantage when docking.
Before tying up the boat, be sure to use
enough dock bumpers to protect the boat from
damage. If possible, tie-up with the bow toward
the waves. Use good quality double-braided ny-
lon line. Tie- up only to the lifting or tie-down
eyes. Never use the handrails or ski pylon.
If the boat is to be moored for a long
period of time, use chafi ng protectors to protect
the gel coat fi nish. Leave a little slack in the
lines, allowing for some wave movement or tidal
action where applicable.
If the boat is to be kept in or near water for the season, consider the purchase of a boat lift. These lifts prevent
the build-up of marine growth on the hull as well as protecting it from damage typical of on-water storage, such as
blistering. Make sure the boat lift supports to the hull correctly. See the next section, Lifting the Boat.

MasterCraft 2007 X-Series Specifications

General

Brand	MasterCraft
Model	2007 X-Series
Category	Boat
Language	English