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sparks from exhaust

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andyisavinit View Drop Down
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    Posted: 24 Oct 2018 at 12:41
so i haven't ridden my mille for about 3 weeks.

On the way to work during half term - so roads were v quiet and was able to ride quiet rapidly (you know within the speed limit of course)

As i was slowing down i check my mirror to see what looked like someone was taking an angle grinder to the back of my bike. Sparks pluming out of the exhaust. 

I pull over and sparks stop at idle, give it a few BIG blips of throttle and sparks come again. After about 5 or six blips they've gone.

I've got shotgun staintunes on. Now, on the lower can, I can see the chrome has discoloured from heat.

Obviously the wadding has broken up and caught fire and scorched the chrome from the inside. When looking into the end can, all i can see is the mesh that holds the wadding in place, which looks in one piece, but it has a white patch which i assume is where the fire/massive heat came from.

Should i be too worried about this? Get them re-packed? I've never had this before. The cans are probably quite old 


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Spoonz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Spoonz Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2018 at 12:49
Originally posted by andyisavinit andyisavinit wrote:

so i haven't ridden my mille for about 3 weeks.

On the way to work during half term - so roads were v quiet and was able to ride quiet rapidly (you know within the speed limit of course)

As i was slowing down i check my mirror to see what looked like someone was taking an angle grinder to the back of my bike. Sparks pluming out of the exhaust. 

I pull over and sparks stop at idle, give it a few BIG blips of throttle and sparks come again. After about 5 or six blips they've gone.

I've got shotgun staintunes on. Now, on the lower can, I can see the chrome has discoloured from heat.

Obviously the wadding has broken up and caught fire and scorched the chrome from the inside. When looking into the end can, all i can see is the mesh that holds the wadding in place, which looks in one piece, but it has a white patch which i assume is where the fire/massive heat came from.

Should i be too worried about this? Get them re-packed? I've never had this before. The cans are probably quite old 



Short answer yes.

The more the packing breaks up the more it will likely blow out so the process will accelerate and you will gradually lose performance as it does as the pockets of missing wadding will trap exhaust gasses etc.

Plus if a police car follows you and see's sparks you will almost certainly get pulled. Not that it's an offence but if gives them reason to scrutinise you and issue a rectification notice.
 
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andyisavinit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andyisavinit Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2018 at 15:18
yeh thought so - I looked into re packing a while ago for another exhaust. Seems its quite a difficult diy job. having to drill out rivets and then trying to re-rivet back up. And sending it off to get repacked would cost more than replacing with a second hand can.

Anyone know a reasonably priced way to sort out new packing? I like my shotguns Cry
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Af1 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2018 at 18:06

I put a ccm mx bike on the road in 1980. It was very loud.
I wired a brillo pad into the exhaust to silence it a bit for the mot.

Any two days later the brillo pad was melting and i accidently shot a dog and a pedestrian with the molten brillo pad , accidently of course.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote constant Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2018 at 19:08
af1 thats a beauty bet you had some fun on that and i bet you wished you still had it if you no longer have when i was a kid a feller had one at quarry where we used to ride at it sounded fantastic
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Spoonz Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2018 at 19:16
Originally posted by andyisavinit andyisavinit wrote:

yeh thought so - I looked into re packing a while ago for another exhaust. Seems its quite a difficult diy job. having to drill out rivets and then trying to re-rivet back up. And sending it off to get repacked would cost more than replacing with a second hand can.

Anyone know a reasonably priced way to sort out new packing? I like my shotgunsĀ Cry




It's not at all hard. The rivets drill out fairly easily if you use a nice sharp drill. If you buy blanket wadding then it's cheap and easy to wrap around the core. Just wire or tape it tight and it will slip back in easy. £5 for a cheapy rivet gun on ebay or borrow one and a few rivets and your done.
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andyisavinit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andyisavinit Quote  Post ReplyReply Direct Link To This Post Posted: 26 Oct 2018 at 12:03
Originally posted by Spoonz Spoonz wrote:

Originally posted by andyisavinit andyisavinit wrote:

yeh thought so - I looked into re packing a while ago for another exhaust. Seems its quite a difficult diy job. having to drill out rivets and then trying to re-rivet back up. And sending it off to get repacked would cost more than replacing with a second hand can.

Anyone know a reasonably priced way to sort out new packing? I like my shotguns Cry




It's not at all hard. The rivets drill out fairly easily if you use a nice sharp drill. If you buy blanket wadding then it's cheap and easy to wrap around the core. Just wire or tape it tight and it will slip back in easy. £5 for a cheapy rivet gun on ebay or borrow one and a few rivets and your done.


Well you've got me interested again - but I've just had a look and the cans aren't riveted - they're welded closed!




How do i get in there?


Heat damage pic below.


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426hemi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 426hemi Quote  Post ReplyReply Direct Link To This Post Posted: 26 Oct 2018 at 13:20
Send them to mhp exhausts, he can repack them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andyisavinit Quote  Post ReplyReply Direct Link To This Post Posted: 26 Oct 2018 at 14:18
Originally posted by 426hemi 426hemi wrote:

Send them to mhp exhausts, he can repack them.

Thank a lot - I sent him an email with a link to this thread. Cheers
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Spoonz Quote  Post ReplyReply Direct Link To This Post Posted: 26 Oct 2018 at 18:29
Didn't realise they were Staintune. I think they bond the end caps on those so I would imagine it would need a bit of a pain to get them apart without marking them up.

Aren't Staintune supposed to be maintenance free for life ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote legend88 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Oct 2018 at 18:45
They must be at the end of their life then Evil SmileCry
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andyisavinit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andyisavinit Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2018 at 13:44
Originally posted by Spoonz Spoonz wrote:

Didn't realise they were Staintune. I think they bond the end caps on those so I would imagine it would need a bit of a pain to get them apart without marking them up.

Aren't Staintune supposed to be maintenance free for life ?

Ive sent Staintune an email - seem they are only in Australia - i'll let you know what response i get. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andyisavinit Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2018 at 20:56
I got a reply...


Hi Andy,
 
Thanks for the e-mail,
 
The Staintune Mufflers are pack with a two stage Stainless steel packing, sometime on very rare occasions this can catch fire as you have experienced.
 
The Stainless packing can not ignite by its self it needs a fuel, this can happen when a motorcycle is running to rich and un burnt fuel is escaping though the exhaust port into
Exhaust system it can build up over time and then when the temperature is right like going for a fast ride then slowing down, boom fire works!
 
The Staintune mufflers are not chrome and the heat spot will polish out, they would need to cut open and re welded if you wanted to have them repacked.
 
You can still use them if the core is still intact.
 
Hope this has helped a little, I would check the fuelling of your motorcycle the main area would be running rich at lower RPM that seam to be a common issue that fuels up an exhaust core and packing.
 
Kind regards
Adam
Staintune




I had my bike tuned by griff (summer last year) with the same system on, so I don't think there should be a fuelling issue. The core is intact, so i think i'll just carry on.

Hope this helps someone else...
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