Yoshimura R77 exhaust melting Givi v35 panniers

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Yoshimura R77 exhaust melting Givi v35 panniers

Post  Dazza18 on Sat 07 Dec 2013, 3:06 pm

Hi, guys any assistance on this please would be much appreciated.
Bought my Bandit a few weeks ago and went for a long ride and came back to discover that the exhuast had melted the pannier.

Any suggestions on how this can be rectified .

The exhaust is a yoshimura R77. The guy I bought it off obviously didn't do any long rides.

Is there some kind if bracket I can make to direct exhaust fumes away from pannier?

Thanks.
Darryn

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Bosco15 on Sat 07 Dec 2013, 3:43 pm

Hey Dazza. Is it heat from the gasses leaving the end of the exhaust tip that has done the damage?
Or is it possible that radiated heat from the hot can has melted the pannier? I don't know the exact setup of your Yoshi, but I would think that the tip would have to be pretty close for hot gas to melt pannier. 
The reason I ask is that if it's hot gasses, you may be able to put some sort of diffuser or angled piece on the end of your can. If its radiant heat, then a heat shield similar to Harleys may help. It's just a chromed bit of tin that sit over your end can and gives an air gap between hot surface of exhaust and shield. Usually to stop people melting themselves on the exhausts. I had one lying around somewhere. If I can find and it will help, you can have it.

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Dazza18 on Sat 07 Dec 2013, 3:59 pm

Hey Bosco,
Thanks for the reply. I will try upload some pics today so you can see the position. It's the heat of the gasses leaving the exhaust tip that's has caused it to melt. The clearance between the tip and the pannie rid bout an inch or two so there is a lot of clearance.

Awesome thanks for your help much appreciated.

Cheers,

Darryn

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Hammy on Sat 07 Dec 2013, 4:19 pm

Obviously the R77 is not long enough. You may have to go with a slightly longer can to clear the pannier. You could swap with someone who has one that would suit. Mmmmmmmm. who could have one ?????    I know !  ME .   Very Happy   I have a Delkevic Carbon Fibre one that would probably do the trick just nicely.  Interested ?

The delkevic is 390mm to the exhaust tip from the centre of the mounting bolt.
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photos

Post  Dazza18 on Sat 07 Dec 2013, 4:34 pm


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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  barry_mcki on Sat 07 Dec 2013, 4:36 pm

Darryn - I've seen photos of the result of an exhaust melting the pannier, but never experienced it.  I've just finished a pretty long trex to Cowra and back, with a bit of Melbourne stop start traffic in the middle, my panniers are ok (same setup as you, i.e. R77 with V35's):



A couple of other members have made a small exhuast holder extender that pushes the whole can down about an inch, this is a photo of Kewwig's setup:



Bosco is on the money as far as the exhaust gas, my carbon R77 can be touched by hand as soon as I turn off the bike so I can't see it being the can's radiant heat.  The exhaust sould be positioned so it is not directed at the pannier, on my R77 it seems to miss it fairly easily.

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Dazza18 on Sat 07 Dec 2013, 4:43 pm

Hi,
That's weird how you have the same set up with pipe and panniers and don't experience the problem. I may have to take the pipe off and play around with it. Or as you suggest try and make up the extender like Kewwigs setup. Wonder if I can contact him and see if he can give me the measurements of the bracket that he made..

Darryn

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Dazza18 on Sat 07 Dec 2013, 4:44 pm

I have just posted three photos of the damage..

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Kiwisteve on Sat 07 Dec 2013, 4:47 pm

You probably could contact Kewwig, but it'd be nice if you went to intro's & let us know a bit about yourself. IE: the fact you're from WA etc


Last edited by Kiwisteve on Sat 07 Dec 2013, 4:55 pm; edited 1 time in total

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Hammy on Sat 07 Dec 2013, 4:51 pm

My offer still stands to swap cans.  Very Happy
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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  gus on Sat 07 Dec 2013, 4:56 pm

What about gluing some rubber matting to the underside of the pannier ?
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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Boatz on Sat 07 Dec 2013, 6:12 pm

Something like this should help.
 http://www.supercheapauto.com.au/online-store/products/Race-Series-Heatshield-Material-700mm-x-290mm.aspx?pid=121225&menuFrom=50605

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  kewwig on Sun 08 Dec 2013, 6:11 am

Dazza18 wrote:Hi,
That's weird how you have the same set up with pipe and panniers and don't experience the problem. I may have to take the pipe off and play around with it. Or as you suggest try and make up the extender like Kewwigs setup. Wonder if I can contact him and see if he can give me the measurements of the bracket that he made..

Darryn
The extension works well.  Never had an issue with bags heating and my Yoshi exits under the bags.  All I did was loosen the link pipe mount, then grabbed a piece of aluminium strap and drilled one end to fit the Yoshi mount.  I found rotating the link pipe slightly as it enters the can, plus pushing down a bit gave plenty of room.  I then marked the strap, cut it, drilled it and filed the ends.  Cost about $10, and only because i had to buy a metre of the stuff.  Best to make one up for your pipe as measuring mine only works for my Yoshi TRS and the angle the link pipe is attached and rotated.
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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Kaupy1962 on Mon 09 Dec 2013, 11:20 pm

A bit of heat foil?
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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  barry_mcki on Tue 01 Sep 2015, 6:16 pm

After my post above I have managed to melt the right pannier.  The repair is ongoing so instead of hijacking the Phillip Island thread too much I thought I'd put the latest info here:

madmax wrote:
barry_mcki wrote:
Chook wrote:He had 1 pannier dedicated to feeding Axle on the Parkes trip lol!

And the other side I used for making toasties  Embarassed  Embarassed  Embarassed


How'd you go patching that up?

Still working on it, thought I'd try my hand at plastic welding so I got some new feeder tips for my heat gun but haven't been able to get it right on the practise stuff yet, much like my metal welding Embarassed



I have installed a 38mm extension link on the rear mount, this has dropped the rear of the Yoshi by a couple of inches.



I've also got some stick-on heat shielding from one of the exhaust places down here, but I'm in two minds about using, adhesive fixing on something that subject to road and weather conditions, I'm not convinced it will last the distance.  I'm pretty sure (hoping like all fcuk) that dropping the muffler will do the trick.


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Re R77 Yoshi exhaust

Post  talon440 on Tue 01 Sep 2015, 8:24 pm

barry_mcki wrote:After my post above I have managed to melt the right pannier.  The repair is ongoing so instead of hijacking the Phillip Island thread too much I thought I'd put the latest info here:

madmax wrote:
barry_mcki wrote:
Chook wrote:He had 1 pannier dedicated to feeding Axle on the Parkes trip lol!

And the other side I used for making toasties  Embarassed  Embarassed  Embarassed


How'd you go patching that up?

Still working on it, thought I'd try my hand at plastic welding so I got some new feeder tips for my heat gun but haven't been able to get it right on the practise stuff yet, much like my metal welding Embarassed



I have installed a 38mm extension link on the rear mount, this has dropped the rear of the Yoshi by a couple of inches.



I've also got some stick-on heat shielding from one of the exhaust places down here, but I'm in two minds about using, adhesive fixing on something that subject to road and weather conditions, I'm not convinced it will last the distance.  I'm pretty sure (hoping like all fcuk) that dropping the muffler will do the trick.


These mufflers come with an insert to quiet them down, why dont you modify it so it just sticks out the end pointing down slightly away from the panniers
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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  talon440 on Tue 01 Sep 2015, 8:29 pm

Hammy wrote:Obviously the R77 is not long enough. You may have to go with a slightly longer can to clear the pannier. You could swap with someone who has one that would suit. Mmmmmmmm. who could have one ?????    I know !  ME .   Very Happy   I have a Delkevic Carbon Fibre one that would probably do the trick just nicely.  Interested ?

The delkevic is 390mm to the exhaust tip from the centre of the mounting bolt.

Hammy, the delkevic muffler has a much deeper note to it than the yoshi, i found the yoshi annoying on along ride and had to put the insert in it to make it sound better
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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  barry_mcki on Tue 01 Sep 2015, 9:51 pm

talon440 wrote:These mufflers come with an insert to quiet them down, why dont you modify it so it just sticks out the end pointing down slightly away from the panniers

The Yoshi/V35 setup had been on my rig for over two years, including a monotonous long 110kph trip down the Hume from Canberra to Melbourne during summer and there had been no sign of melting.  

I think the reason I sustained this damage on the Parkes trip was due to the hot weather, some good fast long Hay Plains straights and then having to stop for cattle.  During these stops, I just let the bike idle and I believe because there was no wind to draw the heat away it just rose out of the end of the pipe and with the pannier being so close it just melted.  

This happened in the first 500km of a 4000km trip and I never let the bike idle hot from then on, the hole got no worse.  In fact the plastic never got anywhere close to a soft gooey state, even though it had formed an inverse crater rim around the hole and was actually hanging lower than the pannier body itself.

So I don't think the main issue is the angle of the exhaust, but rather how much air is flowing (or in this case not flowing) along the bike to extract the hot exhaust gases away.  The modified mounting arrangement now allows the exhaust end not only to be significantly lower but also angled so that gasses coming straight out misses the pannier.

However as another safety idea, I have been looking for a way to mount a heat shield between the pannier and the exhaust end, so thanks Talon, I might be able to use the silencer insert pipe for that purpose.


Last edited by barry_mcki on Tue 01 Sep 2015, 10:17 pm; edited 1 time in total

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  madmax on Tue 01 Sep 2015, 10:05 pm

If plastic welding not working out for you what about fibreglassing it?

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  barry_mcki on Tue 01 Sep 2015, 10:19 pm

My expertise with welding I think I should fibreglass it anyway to stop the patch falling out Smile

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Re: Yoshimura R77 exhaust melting Givi v35 panniers

Post  Kiwisteve on Fri 04 Sep 2015, 8:06 pm

If you have the correct plastic to weld with, the plastic welding would be spot on. You can not use a different plastic to weld another plastic, it won't take. If someone on the forum has a stuffed pannier of the same make as yours, you should grab at least a small bit of it, then cut it into smaller bits to do the welding. 
Just to quantify my comments, I have done some plastic welding in the past.

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