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Last minute front fender freehand

Other than a possible sprague clutch failure. If the bike has the original 2 brush starter it can give these types of symptoms or if it has a weak battery and/or dirty connections. My symptoms went away once I installed a four brush starter. The whine upon decelerating in gear is most likely coming from the drive pumpkin and is not all that uncommon nor is it always something to worry about. The sound is caused during deceleration because at this point the crown gear is placing thrust on the pinion gear, versus acceleration when the pinion is place thrust on the crown gear. The intensity of this whine is based on the backlash between the two gears which can based on how the backlash was set up during a rebuild to worn bearings. Drain the oil into a clean container check for a metallic appearance and/or fish around in the oil and the diff through the fill and drain holes looking for an abnormal amount of metal pieces or fillings. Don't be alarmed if you come with a small dusting amount of metal this is normal. What you are looking for is an unusual large amount or size. If nothing worrisome is found refill with clean oil, forget it , just ride and learn to ignore the noise.

Sounds like the starter clutch is coming apart. Common issue. Here’s a link.