What do you think of this?

[Bhud]

Not too bad, eh? Spot of JB Weld and it'll be fine...

https://i.ibb.co/z61tp2T/damaged-piston.jpg

[Islander]

That'll buff out.

[stinkwheel]

I've ridden on worse but yeah, probably needs some work.
____________________
“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.

[Nobby the Bastard]

Can't see what the issue is.

What is the red arrow supposed to be pointing to?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Bhud]

That's a QC pass mark. Only the finest pistons get that.

[WD Forte]

[Polarbear]

Pretty
____________________
Triumph Trophy Launch Edition

[dave001]

if you was in India. you would have would fabricated a new piston out of scrap by now.

Its amazing how them guys keep there old bikes running

[MCN]

Araldite is much more superior to JB Weld (which is outdated shite)

But Belzona is vastly superior to both.


I'd go with Belzona 1111 for that repair.

Advantages:
Simple to mix.
Machinable.
Resistant to most chemicals and moderate temperatures.

Well done on catching that before it developed into something more serious.


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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[WD Forte]

[Bhud]

Interesting! I think if I go all around it with Araldite, I won't need to get piston rings. That's an upgrade. I'll have to be very careful though and put on my best cake-making hat.

[Polarbear]

[Fullers1845]

+1 for Belzona, used to use it in my previous job for repairs to ally machine casings. Eye-watering cost (and fumes when you mix it) but amazingly strong.

[MCN]

[that_impulse_guy]

can you just put an ohlins sticker over the bad bit?
____________________
Gone: Yamaha DT50lc, Suzuki DR500, Suzuki A100, Kawasaki z250ltd, RD350YPVS, Suzuki DR Big, Kawasaki AR125, Kawasaki KMX200, Suzuki GS1000S, Katana 1100, GS550M, Suzuki RGV250
Now: Suzuki GSX400X, Suzuki RF900R, NS400R

[skatefreak]

I'll raise you a valve

[Pete.]

[stinkwheel]

I like west systems epoxies, thickened with various additives depending on application.
____________________
“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.

[A100man]

[that_impulse_guy]

I think the F401 is the genuine item on the engine case.

chinese one start with K157FM or QJ157 etc.
(k - manufacturer)
(1 - single cylnider)
(57 = bore)
(suffix = designation/cooling/havent figured it out yet)
____________________
Gone: Yamaha DT50lc, Suzuki DR500, Suzuki A100, Kawasaki z250ltd, RD350YPVS, Suzuki DR Big, Kawasaki AR125, Kawasaki KMX200, Suzuki GS1000S, Katana 1100, GS550M, Suzuki RGV250
Now: Suzuki GSX400X, Suzuki RF900R, NS400R

[skatefreak]

[A100man]

[jeffyjeff]

to my untrained eye, I would guess that a piece of the piston ring broke off, perhaps due to insufficient end gap, and began working against the ring groove until the groove started to hog out. Likely to be corresponding damage to the cylinder bore to match.
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History shows again and again how nature points out the folly of men - BOC

[Bhud]

[xX-Alex-Xx]