diff --git a/demos/car.html b/demos/car.html
index 0c5e7795..99411416 100644
--- a/demos/car.html
+++ b/demos/car.html
@@ -78,8 +78,8 @@
             world.addConstraint(revoluteFront);
 
             // Enable the constraint motor for the back wheel
-            revoluteBack.motorEnabled = true;
-            revoluteBack.motorSpeed = 10; // Rotational speed in radians per second
+            revoluteBack.enableMotor();
+            revoluteBack.setMotorSpeed(10); // Rotational speed in radians per second
 
             this.frame(0, 0, 8, 6);
         });
diff --git a/demos/piston.html b/demos/piston.html
index 563eec16..22393933 100644
--- a/demos/piston.html
+++ b/demos/piston.html
@@ -47,8 +47,8 @@
                 worldPivot: [0, 0],
                 collideConnected: false
             });
-            c.motorEnabled = true;
-            c.motorSpeed = 5;
+            c.enableMotor();
+            c.setMotorSpeed(5);
             world.addConstraint(c);
 
             // Create arm
diff --git a/demos/segway.html b/demos/segway.html
index c57008c8..6daf2443 100644
--- a/demos/segway.html
+++ b/demos/segway.html
@@ -65,7 +65,7 @@
                 collideConnected: false
             });
             world.addConstraint(wheelJoint);
-            wheelJoint.motorEnabled = true;
+            wheelJoint.enableMotor();
             var m = 40;
             wheelJoint.motorEquation.maxForce = m;
             wheelJoint.motorEquation.minForce = -m;
@@ -106,7 +106,7 @@
 
                 // this is the only output
                 var targetAngularVelocity = -targetSpeed / (2 * Math.PI * wheelBody.shapes[0].radius); // wheel circumference = 2*pi*r
-                wheelJoint.motorSpeed = targetAngularVelocity;
+                wheelJoint.setMotorSpeed(targetAngularVelocity);
             });
 
             app.frame(3,5,16,16);