Grease Fitting WARNING!
I am not trying to scare anyone. But in case you haven't looked under your bike recently, there are 3 little grease zerks on the rocker arm that connects the frame to your rear shock absorber. The rocker is made of cast aluminum.
Since these little fittings are the lowest point on the bike, if you hit a speed bump or bottom out in any way, you will probably rip at least one of them out of the casting. At this point there is no easy fix to the missing fitting because it probably took part of the casting with it. This is not a ride ending deal, but over time the grease will leak out and water will get in and eventually the shaft inside will probably start to squeak and may even sieze up.
Many riders I have spoken with recommend to replace these zerks before they get ripped out the hard way. You can buy M6-1.0 stainless steel socket head set screws that will replace these zerks. Just grease up the zerks in place, then remove them and screw in the set screws. Keep the old zerks so that when you need to re-grease, you can just screw them in. If it is already to late for your bike, join me in the joy of trying to re-tap the hole for an M8-1.25 set screw.
I hope this is helpful to everyone.
'07 VN900 Classic
Horsepower is an illusion.
Torque is the source of all good things.