Yz125 Cylinder Sleeve

Duke28
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Duke28 12/15/2020 3:24pm
12/15/2020 3:24pm
Need to get a new sleeve in my 2012 yz125 cylinder. Is LA sleeve my only option?

Thanks!
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Paul_Pitzonka
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Paul_Pitzonka 12/15/2020 3:37pm
12/15/2020 3:37pm
Duke28 wrote:
Need to get a new sleeve in my 2012 yz125 cylinder. Is LA sleeve my only option?

Thanks!
If you’re still running stock bore size have it re-plated instead... Powerseal or Millennium would be my recommendations
Duke28
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Duke28 12/15/2020 4:31pm
12/15/2020 4:31pm
Duke28 wrote:
Need to get a new sleeve in my 2012 yz125 cylinder. Is LA sleeve my only option?

Thanks!
Paul_Pitzonka wrote:
If you’re still running stock bore size have it re-plated instead... Powerseal or Millennium would be my recommendations
There is a crack on the cylinder. At the bridge in the exhaust port.
JBoneMotorworks 12/15/2020 4:47pm
12/15/2020 4:47pm Edited Date/Time 12/15/2020 4:48pm
Powerseal USA in PA can weld, profile, re-plate it, they can also add a better relief around the exh port and bridge. I sent them some cylinders over the years that I was like NO WAY they can fix but they did.

DO NOT use a sleeve in your YZ125...many of the YZ's crack there bc they make it very thin to get more exh clearance and window opening, it helps power. They can actually weld more meat on there so it doesn't crack again...that is the thinnest and the hottest part of the cyl and it bulges into the cyl when super hot.

Call and ask for Chris, he can get it done for you. Also send in, (or buy from them), a replacement piston so they can finish hone it to clearance the bore. Ask them if they need any power valve stuff to make sure it clears any slag build up to.

Good luck-
4
Paul_Pitzonka
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Paul_Pitzonka 12/15/2020 4:48pm
12/15/2020 4:48pm Edited Date/Time 12/15/2020 4:48pm
Duke28 wrote:
Need to get a new sleeve in my 2012 yz125 cylinder. Is LA sleeve my only option?

Thanks!
Paul_Pitzonka wrote:
If you’re still running stock bore size have it re-plated instead... Powerseal or Millennium would be my recommendations
Duke28 wrote:
There is a crack on the cylinder. At the bridge in the exhaust port.
Most of the time they can be welded and relieved properly prior to plating...
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YZed250
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YZed250 12/16/2020 7:05pm
12/16/2020 7:05pm
As JBone said, don't sleeve it.
I realize there is a cost and time saving to go that way, but its well worth waiting for replate.
krgperformance
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Sterling Heights, MI US
krgperformance 12/17/2020 10:07am
12/17/2020 10:07am
re plate it
re plate is 200-250.00

125.00 ish for a sleeve labor to install 200-300.00
1
NoMuff2Tuff
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NoMuff2Tuff 1/20/2021 6:11pm
1/20/2021 6:11pm
Whatever you do, do not sleeve. You will loose a lot of power especially if the ports are pretty far off. I once replaced a sleeved cylinder with a brand new OEM cylinder on a 98 YZ 125 and it was night and day difference on how much stronger the bike was. On the sleeved cylinder it felt like a rag was stuck in the intake boot. A sleeved cylinder will also retain a lot more heat
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