Scored skirt

[A100man]

sadly not like that..

However I have hatched a plan to rejuvenate an engine. It's a 598 (58.5mm) but bores are pitted. I have cylinders from a 528 (57mm) (Yamaha xj series) that I will get bored to the correct diameter. The only slight issue is some scoring on the skirt of a piston. I have dressed it with a scothbrite and while you can see the scoring still it doesn't catch a nail and its not present above the rings..

Is this the sort of thing that ca be re-used given that the bore will be smooth?

Cheers

J

Oversize pistons are not available before anyone suggests and even if they were it would be ruiniously expensive (500 quid region)..
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Pete.]

If the piston is round, turn it down to an acceptable finish before boring the cylinders to suit. You might have to re-depth the ring grooves but it's unlikely if the damage is as slight as you say. You might also find that the piston is tapered so be sure to turn the appropriate taper into it.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[A100man]

Pete, thanks for the reply. I was hoping to just machine the bore to suit the pistons 'as is'. Not sure I can justify spending too much time/money on this. A top end gasket set and a rebore was my thinking. I can probably buy some better pistons though..

here's what I have

https://lh3.googleusercontent.com/-D2IQfwm640U/VvgW9V_h4BI/AAAAAAAAAWA/KKeBY-nFDP0wSUkwh_GkGXCZ2Y0lX9VsACCo/s576-Ic42/20160327_181439.jpg


Bugger -why can't I post pics..?

*Because your link was to a webpage, not an image. An image link will end in the extension .jpg, .png, .gif.

From the page you linked to. Right click on the image and select "copy image URL". Paste that into your post and wrap it in image tags like you did.

One slight further complication with google images, you need to remove the 's" from the 'https://' - stinkwheel*
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[stinkwheel]

On a more relevant note. That scoring seems very light indeed. I wouldn't worry about it.

At the end of the day, what does the piston skirt actually do? In the normal scheme of things, nothing.
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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.

[weasley]

[A100man]

Thank S-W, and W -on both counts - what I was hoping to hear.
In all probabily the scoring happened during the removal/ unsiezing of a pitted/rusty bore..

Cheers

J
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600