Things You'll Need
One quart, aluminum-safe ethylene glycol antifreeze
One quart, distilled water
Two-quart resealable plastic containers
Wheel chock
Allen wrench set
Ignition key
Torque wrench
Shop towels
Phillips screwdriver
The RS125 was a small 125 cc liquid-cooled two-stroke-engined sport motorcycle produced by Aprilia, an Italian manufacturer. Production of the RS 125 commenced in 1992 and, as of 2011, it continues to be a popular choice for beginning motorcycle riders and racers around the world. As part of the RS125's maintenance schedule, Aprilia recommends a complete change of the antifreeze coolant every two years. But the coolant should be changed after every race, if the RS125 is used in competition.
Step 1
Mix one quart of aluminum-safe glycol ethylene antifreeze with one quart of distilled water in a two-quart plastic container.
Step 2
Select a level work space and mount the motorcycle on a wheel chock to support it in an upright position. Let the engine cool for a minimum of one hour.
Step 3
Remove the two bolts above the left front turn signal, followed by the three bolts joining the left side fairing to the left lower fairing, using an Allen wrench. Remove the bolt from the left inner fairing panel, near the front wheel, and the bolt behind the left side fairing air duct. Pull the left side fairing away from the motorcycle and unplug the front turn signal connectors from the motorcycle's wiring harness.
Step 4
Insert the ignition key into the seat release latch, located below the left side of the fuel tank. Turn the key counterclockwise and pull the seat off. Remove the mounting bolt from the front of the fuel tank, near the handlebars, using an Allen wrench. Lift the tank up and away from the frame, then support it in its fully raised position using the prop rod included with the motorcycle's tool kit.
Step 5
Remove the filler cap from the coolant expansion tank, located between the main frame rails above the engine near the battery. Place a two-quart resealable plastic container below the coolant drain plug, located on the left side of the engine near the front engine mount. Unscrew the drain plug using an Allen wrench. Let the coolant drain to a light trickle, then screw the drain plug into place. Tighten the plug to 17 inch-pounds using a torque wrench.
Step 6
Fill the coolant expansion tank with your pre-mixed antifreeze until the fluid level is flush the "Full" mark imprinted into the side of the tank.
Step 7
Place a shop towel around the drain screw on the top left corner of the radiator. Loosen the screw using a Phillips screwdriver. Tighten the screw once antifreeze begins to seep out from the loosened screw. Soak up any antifreeze released from the screw using the shop towel.
Step 8
Refill the coolant expansion tank, if the fluid level has decreased to the "Fill" mark.
Step 9
Place a shop towel around the radiator union drain screw, located directly below the left side of the coolant expansion tank. Loosen the screw using a Phillips screwdriver. Tighten the screw once antifreeze begins to seep out from the loosened screw. Soak up any antifreeze released from the screw using the shop towel.
Step 10
Refill the coolant expansion tank, if the fluid level has decreased to the "Fill" mark.
Step 11
Lower the fuel tank onto the motorcycle's frame and screw the mounting bolt into place. Tighten the bolt to 5 foot-pounds. Reinstall the seat, then push down on the front of it until the seat latch clicks into place.
Step 12
Hold the left side fairing panel against the motorcycle. Reach behind the fairing and plug the front turn signal connectors into the motorcycle's wiring harness. Screw the left side fairing panel bolts into place.
Warning
Store used antifreeze in a sealed container away from the reach of children or animals until it can be taken to a recycling center for disposal. Antifreeze contain ethylene glycol alcohol, which has a sweet scent that attracts animals but is extremely poisonous. Used anti-freeze also may be contaminated by heavy metals, increasing the fluid's hazardous properties. Never dump used antifreeze down a drain or into the environment.