Yz125 rebuild question

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12/4/2017 8:04 PM

Picked up a Yz125 a couple weeks ago. Decided to take off the cylinder to see if the "4 hours on fresh rebuild" was true and it actually was. I was shocked. The piston still looks new. But anyway, the cylinder still has the cross hatching. If I throw a new ring on the piston, will I have to hone the cylinder just a little bit and be good, or just not hone it at all?

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12/5/2017 4:38 AM

Just put a new ring in it & let it rip. Do you know what brand of piston it has in it so you know what to buy?

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12/5/2017 4:54 AM

I think you only hone if the crosshatch is gone. In my experiences, if the cylinder is that worn ill just go ahead and get it replated instead of making the diameter bigger with a hone.

To answer your question, put the ring on and go mam.

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

12/5/2017 5:43 AM

Muscle-Milk-KTM wrote:

Just put a new ring in it & let it rip. Do you know what brand of piston it has in it so you know what to buy?

Yes it has a wiseco. I'm a vertex user but the piston looks great still, so I'll just leave it in.

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12/5/2017 7:12 AM

Muscle-Milk-KTM wrote:

Just put a new ring in it & let it rip. Do you know what brand of piston it has in it so you know what to buy?

Rohr144 wrote:

Yes it has a wiseco. I'm a vertex user but the piston looks great still, so I'll just leave it in.

Don't hone it, just deglaze it and you are good to go!

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recmx.com

REC MX, JE Pistons, Wiseco, Rusk Racing, Yoshimura, Enzo Racing, Dubya Wheels, Asterisk, Rocket Performance, CCR Sport, & MMR

12/5/2017 8:04 AM

Muscle-Milk-KTM wrote:

Just put a new ring in it & let it rip. Do you know what brand of piston it has in it so you know what to buy?

Rohr144 wrote:

Yes it has a wiseco. I'm a vertex user but the piston looks great still, so I'll just leave it in.

moto314 wrote:

Don't hone it, just deglaze it and you are good to go!

I'm reading a bunch of different things on different forums about whether or not to deglaze. How would I know if I need to deglaze or not, or is it a necessity before putting it all back together?

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12/5/2017 1:05 PM

If u believe it only has 4 hrs on it then why replace the ring?

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12/5/2017 1:24 PM

ktm-5 wrote:

If u believe it only has 4 hrs on it then why replace the ring?

If I have the money, why not?

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12/5/2017 1:26 PM

ktm-5 wrote:

If u believe it only has 4 hrs on it then why replace the ring?

Don't get me wrong, I see your point, but if I've got cash for a ring and a gasket kit, I might as well, just to make myself feel better about it. The cylinder is already off anyway.

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12/5/2017 1:37 PM

ktm-5 wrote:

If u believe it only has 4 hrs on it then why replace the ring?

Rohr144 wrote:

Don't get me wrong, I see your point, but if I've got cash for a ring and a gasket kit, I might as well, just to make myself feel better about it. The cylinder is already off anyway.

True

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