Pinhole leak in exhaust.

[Kawasaki Jimbo]

I’ve just noticed a pinhole leak in my ZX6R’s exhaust, obvious only because of a small soot mark on the swing arm. There’s been a rough patch on the exhaust for years and when I first saw it I thought it had hit the swingarm somehow, but I think not. A manufacturing blemish maybe, but I there’s a couple of pits there now too.

I’m not too bothered except it seems an odd place for a leak to appear, just back from the can. There’s nothing wrong with the downpipes or the bike generally, it starts and runs well. Does it tell me something about the fuelling?

https://i.postimg.cc/ZYWMR2xZ/IMG-1039.jpg

https://i.postimg.cc/3rzbD1tG/IMG-1040.jpg

[Easy-X]

Scrap of metal, some gunk and a job for a pop-rivet gun?
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Bhud]

This could be one of those cases where it would be helpful to experiment with something new. I'd like to try those flux-core aluminium brazing rods you can get now. Haven't tried them yet but they melt at 550C and cost pennies, so if they don't work they don't work.

[stinkwheel]

Sudden need for a small CF heat shield/rubbing pad held on by two clamps, the back of one of which is sitting squarely over the hole with a dab of silicone?
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Kawasaki Jimbo]

Right, so it’s fixable but I’m wondering why it has happened at that location. Is that where unburnt fuel first meets fresh air and ignites, and is that a fuelling fault?

[sickpup]

[virus]

easily fixable, I wouldnt worry about the cause, its likely to be at random depending on thickness of the metal and any plating etc. Not to mention its in a spot that probably wouldnt be seen and/or regularly cleaned or sorted earlier when it first started blemishing the pipework.
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own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

[xX-Alex-Xx]

[lingeringstin...]

Drill it out a tad and bung in a wee little self tapping screw. I've done that on things and the MOT people never said anything about it.

I