Of course I do have a good amount of slightly used parts that will fill in at a pinch. Had a spare crank that had maybe 100 miles on it. Bummer I had to use it up, as now I don't have a spare anymore.
But I tend to make sure I have at least 2 of everything new that I generally go through on a regular basis.
Top ends
brake pads
chains
set of plugs
reed petals
clutch plate packs
beyond that I have new spares of carb seals, side case seals and pretty much anything else that I just might need that will be needed to do a quick rebuild/repair.
I then have any spare that I take off prior to being warn out just in case I need it in a pinch.
beyond that I have a spare shock, radiator, complete set of internal and external gears (yes, I have pretty much every optional internal gear), cables, bolts, nuts, dowel pins, bearings, spacers, brackets, body work, levers, rims, etc.
All that generally goes to the track with me. It wasn't until I broke a frame that I realized I missed one or two important items in my spare package. Figure a second back up bike would simple take care of that. Just don't have the funds to come up with another bike (or can justify it for a sometime wannabe club racer).
As for the ebay link.
That's pretty expensive for a buy it now price. I think the seller is looking for someone from Europre to buy it and have it shipped. That's the only way they will sell that bike for such a high US $ amount (for 6500 GBP, it's not a bad deal, but $10500 USD?).
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Charles Gallant