It is extremely important to properly clean and lubricate the sprocket bearing.  A bearing that is dirty or dry will waste horsepower because the tiny rollers inside the bearing skid rather than roll.  That increase in friction causes a lot of heat that diminishes acceleration.

Clean the sprocket bearing with chlorinated brake cleaner.  It’s convenient to use, inexpensive, an excellent solvent, dries quickly and it’s non-flammable.

Do not use acetone or non-chlorinated brake cleaner. They pose a serious fire hazard.

Apply a small quantity of Mobil 1® Synthetic Grease to the needle rollers.  This grease is typically used for wheel bearings on cars with disc brakes. It has a 350 degree temperature capacity, resists moisture and contaminants.  It’s inexpensive and available at most auto parts stores.

Do not use Vaseline®. It is a skin lubricant not a metal lubricant and melts at only 165 degrees.