Yep, you'll need that list to tell them what to remove from your old bike. That stuff has
zero value to the dealer. And some of it might actually bring the trade in value down if it's changes from oem stock configuration. They don't want to have to explain why your used bike has flashers or flash to pass and the other used, (or new), bike doesn't.
Besides, they won't give you much for that old junker.
I remember when I asked if they had a loaner I could use. :
)
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You'll take less of a hit if you strip the farkles off yourself and collect them for use on the new bike, then sell the old bike when it gets fixed. Still more outlay up front though, that's for sure.