diff --git a/js/msp/MSPHelper.js b/js/msp/MSPHelper.js
index 78cf30590..8fc009868 100644
--- a/js/msp/MSPHelper.js
+++ b/js/msp/MSPHelper.js
@@ -297,14 +297,14 @@ var mspHelper = (function () {
 
                 // stabilized
                 FC.RC_tuning.RC_EXPO = parseFloat((data.getUint8(offset++) / 100).toFixed(2));
-                FC.RC_tuning.RC_YAW_EXPO = parseFloat((data.getUint8(offset++) / 100).toFixed(2));
+                FC.RC_tuning.RC_YAW_EXPO = parseFloat((data.getInt8(offset++) / 100).toFixed(2));
                 FC.RC_tuning.roll_rate = data.getUint8(offset++) * 10;
                 FC.RC_tuning.pitch_rate = data.getUint8(offset++) * 10;
                 FC.RC_tuning.yaw_rate = data.getUint8(offset++) * 10;
 
                 // manual
                 FC.RC_tuning.manual_RC_EXPO = parseFloat((data.getUint8(offset++) / 100).toFixed(2));
-                FC.RC_tuning.manual_RC_YAW_EXPO = parseFloat((data.getUint8(offset++) / 100).toFixed(2));
+                FC.RC_tuning.manual_RC_YAW_EXPO = parseFloat((data.getInt8(offset++) / 100).toFixed(2));
                 FC.RC_tuning.manual_roll_rate = data.getUint8(offset++);
                 FC.RC_tuning.manual_pitch_rate = data.getUint8(offset++);
                 FC.RC_tuning.manual_yaw_rate = data.getUint8(offset++);
diff --git a/tabs/pid_tuning.js b/tabs/pid_tuning.js
index 196e017cd..bef91b859 100644
--- a/tabs/pid_tuning.js
+++ b/tabs/pid_tuning.js
@@ -50,7 +50,7 @@ TABS.pid_tuning.initialize = function (callback) {
     function drawExpoCanvas(value, $element, color, width, height, clear) {
         let context = $element.getContext("2d");
 
-        if (value < 0 || value > 1) {
+        if (value < -1 || value > 1) {
             return;
         }
 
@@ -284,14 +284,14 @@ TABS.pid_tuning.initialize = function (callback) {
         GUI.sliderize($('#rate_yaw_rate'), FC.RC_tuning.yaw_rate, 40, 1000);
 
         GUI.sliderize($('#rate_rollpitch_expo'), FC.RC_tuning.RC_EXPO * 100, 0, 100);
-        GUI.sliderize($('#rate_yaw_expo'), FC.RC_tuning.RC_YAW_EXPO * 100, 0, 100);
+        GUI.sliderize($('#rate_yaw_expo'), FC.RC_tuning.RC_YAW_EXPO * 100, -100, 100);
 
         GUI.sliderize($('#rate_manual_roll'), FC.RC_tuning.manual_roll_rate, 0, 100);
         GUI.sliderize($('#rate_manual_pitch'), FC.RC_tuning.manual_pitch_rate, 0, 100);
         GUI.sliderize($('#rate_manual_yaw'), FC.RC_tuning.manual_yaw_rate, 0, 100);
 
         GUI.sliderize($('#manual_rollpitch_expo'), FC.RC_tuning.manual_RC_EXPO * 100, 0, 100);
-        GUI.sliderize($('#manual_yaw_expo'), FC.RC_tuning.manual_RC_YAW_EXPO * 100, 0, 100);
+        GUI.sliderize($('#manual_yaw_expo'), FC.RC_tuning.manual_RC_YAW_EXPO * 100, -100, 100);
 
         updatePreview();