Originally Posted by captain america

Things to pay attention to:

-stripped threads/worn screws/rusted screws
-stripped threads in plastic parts
-cracked, sloppy-fitting or severely worn plastic parts
-gear mesh/condition of gears
-hinges should be free-moving, little slop and not bent
-shock shafts/replace shock O rings & oil
-bearings should be free and not notchy or scratchy when turned
-replace main chassis if bent/severely worn/cracked
-rebuild CVDs; replace worn pins and if necessary, worn drive cups
-check/replace worn shock springs (they lose tension over time)
-inspect clutch, de-burr shoes, keep inside of bell free of aluminum buildup
-inspect pipe for obstructions/oil buildup; hammer out dents as needed
-make sure pipe/header springs have sufficient tension; replace as needed