How to change drive belt on Honda mower HRR2168VYA

you cant unless you split it.

If you remove the wheels, there are little keys under spring pressure. The grease lubricating them hardens over time. Clean this out with toothpicks and brake cleaner, reassemble with some wheel bearing grease or grease from a lube gun, and it should work just fine, otherwise maybe the trans has a problem.

Check with PartsTreeRepairClinic they may have a video

The drive belt may be worn and slipping on the pulley. (assuming it is a belt driven model). This would cause the mower to lose a great deal of power to the wheels. By adjusting the cable only, you are effectively adding a little more friction to the belt/pulley interface which in turn will provide a bit more power but the belt may still be slipping on the pulley(s) which is where you could still be losing the majority of your mowers self propulsion. Some Honda models may also employ a belt tensioner that simply adds tension to the belt even if the belt becomes stretched out & worn but the pulley's can become glazed (slippery). If it is a direct "pulley to pulley" drive with a single drive belt (no tensioner) the worn belt can also glaze the pulleys and cause further slipping. You can reface your pulley(s) contact surfaces with a very light grade wet sand paper (1000 grit), a coarse grade steel wool or a scotchbrite abrasive pad, thereby giving the belt more "purchase" on the pulley(s) contact surfaces. If you do perform a refacing of the pulley(s), it is strongly advised that you replace the drive belt as well. Your mower will then function as it did when it was new. Hope this helps.

Remove the plastic cover for the drive belt. Replace the belt.

Replace belt, clean pulleys.

They may make a Kevlar belt that fits your mower, which may stop the breaking. But may cost twice the amount of the original belt. Seems like it may be worth it to me?

the should be a plastic cover under the engine

First, you need to make sure you have the right tools for the job. You'll need a wrench, work gloves, mower blade clamp, drain pan and fresh fuel. Check your owner's manual for the correct belt to your specific lawn mower. Belts that are not specifically designed for your mower will not fit properly and may wear down prematurely. Next, remove the spark plug wire. This is a safety precaution to prevent the mower from accidentally starting.
Now you can remove the screws that secure the drive cover to the mower deck. Once you've taken off the drive cover, loosen the screw that holds the belt tension spring to the transmission. As the screw is loosened, tension on the belt is released allowing you to remove the belt off of the front transmission pulley.
At this point you'll need to turn your mower on its side to take off the mower blade. Be sure to use a work glove to protect your hand when removing the mower blade. You can use a lawn mower blade clamp over the blade to secure it. Unscrew the bolt to remove the blade and then the engine baffle. Once the pulley unit is exposed, you can remove the entire drive belt. Insert the new drive belt and place one end on the rear pulley and re-attach the engine baffle. Then, place the mower blade back (making sure it's facing the correct way with bottom of the blade facing the ground) and tighten the bolt. Remove the clamp and return the mower to its upright position so you can place the other end of the belt to the front pulley. Remember to tighten the screw to the tension spring.
Put the front drive cover back on, tighten the screw that secures the cover to the deck and reconnect the spark plug wire. Add new fuel to your mower and you're done!

The drive belt will not be a Honda part but a Husqvarna part. 532408031 You can also get the same belt as an AYP part by dropping the "532" and using 408031. Hope this helps.