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Author Topic: Sport Touring with an Undertail Exhaust  (Read 2792 times)

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Offline Dan K

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Sport Touring with an Undertail Exhaust
« on: April 11, 2014, 03:04:36 PM »
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
Sometimes, the only answer is defenestration.

Offline chornbe

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Re: Sport Touring with an Undertail Exhaust
« Reply #1 on: April 11, 2014, 03:57:22 PM »
Yikes!

I'll have to check Liz's, though she's got aftermarket mufflers that are smaller diameter and give more of an air gap. The end of the mufflers are WAY lower than the top case bracket; hopefully it's a non-issue.

Thanks for the heads up.
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Offline motormike

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Re: Sport Touring with an Undertail Exhaust
« Reply #2 on: April 11, 2014, 04:19:48 PM »
Sounds like a Sprint issue.   :bigsmile:

Online Cablebandit

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Re: Sport Touring with an Undertail Exhaust
« Reply #3 on: April 12, 2014, 08:58:26 AM »
Under-seat exhaust = winter bike.

Offline Dan K

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Re: Sport Touring with an Undertail Exhaust
« Reply #4 on: April 12, 2014, 10:16:53 PM »
Surprisingly, no heat problems since I had the heat kit installed.

- Dan
Sometimes, the only answer is defenestration.

Online Cablebandit

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Re: Sport Touring with an Undertail Exhaust
« Reply #5 on: April 13, 2014, 09:54:53 AM »
Surprisingly, no heat problems since I had the heat kit installed.

- Dan


Ceramic drawers? 

Offline Dan K

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Re: Sport Touring with an Undertail Exhaust
« Reply #6 on: April 13, 2014, 11:26:12 AM »
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.
Sometimes, the only answer is defenestration.

Online bedlamite

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Re: Sport Touring with an Undertail Exhaust
« Reply #7 on: April 13, 2014, 01:10:23 PM »
Install some slightly longer carbon mufflers. They run very cool. Did that to a friends VFR a few years ago:


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Offline Bryan.VFR

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Re: Sport Touring with an Undertail Exhaust
« Reply #8 on: April 14, 2014, 07:57:33 AM »
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.

Offline tyrroneous

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Re: Sport Touring with an Undertail Exhaust
« Reply #9 on: April 15, 2014, 11:15:13 AM »
Years ago, shortly after I had gotten my '02 VFR, my brother and I took a trip to the Smokey Mtns where he proceded to low side his YZF into a guard rail on the Cherohola Skyway.  He was unhurt and so we ended up riding two-up on my bike for the 10 hr ride back to MS.  I had soft luggage at the time as did my brother.  We just threw his luggage over mine for the ride home.  The extra weight caused the exhaust on the VFR to melt completely through my set of soft bags.  I had a couple of t-shirts with holes burned through them!   :o