Common Maintenance Parts
Based on the owners manual maintenance chart...
Spark plug 12000 miles (Iridium optional)
Oil Filter 3500
Air Filter 7500
Vapor and Brake hose 4 years (but I'll extend that to every hose every 7 years)
O-rings that could be replaced are:
valve inspection
oil fill
oil filter
timing inspection
clutch cover
(red silicone rubber replacements preferred)
Head Plug
And numerous sealing washers.
(old ones make excellent washers on bolts/screws that normally fall off)
Brake pads 5000 ( I would never get oem... kevlar preferred 2x mileage too)
Some of these parts it's common never to replace them (sealing washers), while others are mandatory(brake pads).
With some thought, a couple of kits should sell well.
Yearly kit; 1 sparky, 2 OF, 1 AF, 1 BP
10x kit; All O-rings, HP, Hoses, BH (steel braid)