1. Nope. Why buy yourself trouble? Bargains come and bargains go. Don't vote with your heart! Use your head. The big one!!
2. Now thats over with . . . is the bike under warranty? If so, would your seller mind riding over to the local Triumph shop for a look see at its meatballs and sausage area? At the very least you could learn some good stuff from a Triumph mechanic for free and get a more detailed look at the bike for free, etc. Milk it, milk it!!
3. While you're milking it, this might be a way to squeeze a bit of a concession in the price from the seller who probably knows **** well whats wrong with the bike and thats why he's selling it. Hmmmmmm. If he thinks he's going to have to go through #2 for every potential buyer that comes along he may accept less just to be rid of the "problem".
4. Not happy with the deal? Remember #1.