Removing the grip from the handlebar is required to change the handlebars. One method that uses common household items is described here.
First, pry the end plug out of the handlebar.
Slide a zip tie under the grip to create a gap, then flood the gap with rubbing alcohol. the zip tie only needs to go in about 1.5" to provide the gap required. Pinching the grip to open a starting place is helpful. The alcohol lubricates the grip which can be twisted and slid off the end of the handlebar. Remove both grips.
With the grips removed, loosen the stem clamp at the handlebars using a 6mm allen wrench:
Then rotate the bar so that the clamping bolts are more accessible. Lightly re-tighten the 6mm bolts shown above.
These are the 3 clamps on the Left side (throttle, brake lever, and control buttons)
Using 3mm and 5mm allen wrenches, loosen the clamps for the throttle and brake lever. Slide them off the handlebar and let them hang.
For the buttons, remove the bolt and set it aside. Gently flex the clamp to remove it from the handlebar.
Remove the display panel by removing the two 3mm bolts and flexing the clamps as shown:
On the right side of the handlebar, there are two more clamps-- one for the shifter and one for the brake lever.
Loosen the clamps as shown, and slide the shifter and brake lever off the handlebar.
With the handlebar clear of all accessories, remove the 6mm bolts and face of the clamp to remove the
original handlebars. Install the replacement handlebars, taking care to center them in the clamp. Replace
the face of the clamp, and lightly tighten both 6mm bolts.
Working in reverse of the above steps, replace the right brake lever, the shifter, the center display, the 3 control buttons, the left brake lever, and the throttle. At this point, DO NOT tighten the clamps. You will fine-tune and customize the position of each shortly.
In order to establish a reference position for all the other components, install the handlebar grips and end plugs.
Again, rubbing alcohol can be a useful lubricant.
Tighten the 6mm bolts in such a way that you can rotate them, but they stay in place when you let go.
Stand astride the bike, and rotate the bars to a position that is comfortable for you. Securely tighten the two 6mm bolts.
On the left side, bring the throttle against the grip, and secure the clamp's 3mm bolt.
On the right side, position the shifter so that the orange icon is easily visible, slide it against the grip, and secure that clamp's 3mm bolt.
Now rotate both brake levers so that they are at a comfortable angle, slide them up against the throttle and shifter respectively, and secure each of the 5mm bolts.
Position the Display panel so that it can be seen from the riding position. Tighten the two 3mm bolts.
Move the 3 control buttons close to the left brake lever and tighten the 3mm bolt.
Lastly, make sure the grips are firmly in place before riding, if you used alcohol, this can take a few hours.
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