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Few questions about YZ250 01 cylinder

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Hello,

so I decided to inspect the condition of cylinder so I could start new season with a decent bike. Bike ran well before I took it apart. It needed about 1-3 kicks before it started with cold engine and 1-2 kicks with hot engine. 

Bought it used so I really had no idea what condition it was inside (after buying, I drove about 18 hours with it).

 

There are 3 wear marks that you can feel with a finger, one a little bit deeper than others. How bad are these? Are they safe to drive for lets say another 20-30 hours or should I consider to get it re-plated or changed right away?

I'm fairly new to 2-stroke engines.

 

Everything on pictures is as it came off, nothing cleaned.

Here are the pictures: 

1.jpg2.jpg3.jpg4.jpg5.jpg

 

Thanks

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