So I'm looking at my old photobucket pics and I find this shot of the bottom of my topcase.

I ride an '06 Sprint ST with the undertail exhaust. I've had it for a few years, and the topcase is almost always on it, as I commute to work whenever it's 40F+ and less than 30% chance of rain (at least no rain on the way in).

The locking mechanism on my last top case stopped functioning - don't really know why. It would lock shut, but it wouldn't lock to the bike. I assumed (apparently correctly) that it melted.

For the replacement, I added some adhesive heat shielding to avoid a repeat. Take a look at this pic - one season of riding, and you can see markings from either the exhaust gases or heat, not sure which.

Moral of the story? Undertail exhausts are not the best mix with top cases... hopefully the heat shielding will do the job.

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- Dan

Sounds like a Sprint issue.   

Surprisingly, no heat problems since I had the heat kit installed.

- Dan

Not so drastic measures. Heat resistant foam in certain spots to ensure proper air flow and no leaks of heat to the body.

That under tail exhaust sure looks good tho.

I've heard that heat was an issue on those Sprints. That was supposedly one of the reasons Triumph went with a traditional side exhaust on the Sprint GT.

I love the looks of the undertail exhaust, and thankfully have not had a problem with them on my VFR. I don't use a topcase, though, just the side cases, which I haven't taken off in years except to wash the bike.