Is This To Be Expected?

[GettinBetter]

Looking at bikes...
saw this...

https://m.atcdn.co.uk/a/media/w800h600/4abd81fbe7314a429223cc0b4bc58630.jpg

Is that exhaust discolouration the norm' I thought this type of thing had been designed out by now?

Asking for a friend

[chickenstrip]

Looks to me like something that has been done deliberately. Usually, most exhaust discolouration happens at the hottest part, i.e. the down pipes where they exit the cylinder block. That looks like someone has introduced excess heat at a part of the exhaust that would normally be relatively cool by comparison.
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Chickenystripgeezer's Biking Life (Latest update 19/10/18) Belgium, France, Italy, Austria tour 2016 Picos de Europa, Pyrenees and French Alps tour 2017 Scotland Trip 1, now with BONUS FEATURE edit, 5/10/19, on page 2 Scotland Trip 2 Luxembourg, Black Forest, Switzerland, Vosges Trip 2017
THERE'S MILLIONS OF CHICKENSTRIPS OUT THERE!

[Kawasaki Jimbo]

Interesting. Saddlebags? Backfires?

[arry]

[Nobby the Bastard]

I suspect it's caused by diarrhea at the first corner the owner reached. The percentage of semen contained in said diarrhea would obviously depend on how hot they look in their arseless chaps.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[stinkwheel]

[GettinBetter]

[GettinBetter]

[Nobby the Bastard]

[chickenstrip]

I still think it's a deliberate effect. I think saddlebags wouldn't be so evenly distributed in colour, either along the length of the effect, or around the exhaust, but would change outwards from where saddlebags came into contact.

[stinkwheel]

[chickenstrip]

Can you actually thrash an engine like the OP's example, big, lazy v-twin - perhaps a lot of torque but not much in the way of peak power? Pinned at WOT for prolonged periods? I find that unlikely for numerous reasons!
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Chickenystripgeezer's Biking Life (Latest update 19/10/18) Belgium, France, Italy, Austria tour 2016 Picos de Europa, Pyrenees and French Alps tour 2017 Scotland Trip 1, now with BONUS FEATURE edit, 5/10/19, on page 2 Scotland Trip 2 Luxembourg, Black Forest, Switzerland, Vosges Trip 2017
THERE'S MILLIONS OF CHICKENSTRIPS OUT THERE!

[stinkwheel]

[GettinBetter]

[Nobby the Bastard]

To be honest I'm amazed that it managed to get that hot on a Harvey. I would have thought that it would have fallen off because of the vibration before it got hot enough to discolour.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[xX-Alex-Xx]

Looks like someone’s poorly taken a blowtorch to it to heat up the metal.
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DILLIGAF

[RhynoCZ]

I think someone drilled out the end baffle and removed whatever sound dampening material was there and then put the end baffle back in. It looks exactly like a 90's sports bike open exhaust system that needs some fresh ''wool''.

EDIT: Or it's just a bad design combined with an owner who enjoys revving the engine in neutral.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[ThunderRat]

I had a Laser straight through back in the 80's on an old GS550. The whole system looked like that. My Harris Works downpipes also on a GPz750a.

[Shaft]

[Easy-X]

[Kawasaki Jimbo]

1300.
Sold.
https://fasttrackmotorcycles.co.uk/used-2007-Yamaha-XVS-1300-A-Midnight-Star&id=4119

[NJD]

[trevor saxe-coburg-gotha]

welcome to dealers
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"Life is a sexually transmitted disease and the mortality rate is one hundred percent."

Mobylette Type 50 ---> Raleigh Grifter ---> Neval Minsk 125

[arry]

[NJD]