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C50 SlS257 Quote
3/23/2017 1:19 PM

I have a YZ 250 with 10 hours on a new coated Wiseco piston. The coating is now worn off. Is this normal? Fist time using a coated piston on a two stroke. Thanks

C50_engine.f_1455853935 BobPA Quote
3/23/2017 5:03 PM

Pretty normal. The coating is mostly for the break in period.

Jason Anderson FTW

C50 SlS257 Quote
3/23/2017 6:52 PM

Thanks. I actually called Wiseco and they said the coating should not wear off. Everyone who uses one says it does wear off. Kinda funny really. Thanks for the reply man.

C50_screenshot_2017_01_02_16_15_37_1491551658 ktm-5 Quote
3/23/2017 8:56 PM

Could the cylinder be worn out and wearing the piston sooner than should be??

C50 SlS257 Quote
3/24/2017 8:55 AM

Cylinder is brand new. Talked to a couple other people that run them. They all have the coating wear off too. It's normal, but wiseco says it's not. No biggie. Just gonna run vertex I guess

C50_thca0u0nkk_1388583665 DJS721 Quote
3/24/2017 9:23 AM

Some wear is normal, the coating is not a break in type. I would look closely at the piston skirt and see if there is evidence of some dirt coming through the top end. Even a small amount of debris will cause the material to buff down

Most skirt coatings are not impervious to dirt or other effects, but some minor buffing is normal

C50 Dtat720 Quote
3/25/2017 6:32 AM
SlS257 wrote:

Cylinder is brand new. ...more

Sounds like the piston and bore are not matched and you are getting excessive heat/ friction. The costing should not wear off. I run coated wiseco pistons in my RM250 and currently have just over 20 hours and the coating is almost like new. It is not a break in coating. But, on break in, did you coat the piston in premix before kicking it over? Or was it a dry install?

C50 Bricktop72 Quote
4/12/2017 3:59 AM

I wonder if they got a bad batch of pistons because I am having the same problem. I have been waiting for over a week for a response after sending pictures in.

Top piston is my last one that had 45 hours on it and ran in a damaged cylinder with bare aluminum showing through the plating in spots.

The second 2 pictures are my current piston after on 13 hours on a fresh replate.


C50 Acidreamer Quote
4/12/2017 4:33 AM

ive never seen a worn piston without wear on the sides. When i see something like this i replace it. 10 hours is about the max id run a piston anyways.

2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

C50_dsc_0669_1470385124 Turbojez Quote
4/12/2017 6:53 AM
Acidreamer wrote:

ive never seen a worn ...more

10 hours?! Isn't it a bit too often?

C50 SlS257 Quote
4/12/2017 8:28 AM
Bricktop72 wrote:

I wonder if they got a bad ...more

That's mine with 10 hours on it. I put a vertex in and checked it after 5 hours. It's getting eaten up. Got some scratches in it already. I measured the cylinder when I got it back from millineum. It checked good. Not sure if I have a bend rod or something. Maybe the cylinder is tight in a spot or too. Gonna check the clearance with some feeler gauges while it's all torqued down. been riding it anyways runs good. Cylinder is already kinda junk now. So if it blows up who cares. Lol.
C50 Acidreamer Quote
4/12/2017 8:46 AM
Acidreamer wrote:

ive never seen a worn ...more

Turbojez wrote:

10 hours?! Isn't it a bit ...more

Not really. Theres guys that change top ends between motos lol. Yz250 service manual says to replace the piston every 5 races. Thats 5 hours if they mean 30+2 motos.

2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

C50_dsc01780ed_1486949360 ohiomotoxer Quote
4/13/2017 6:04 PM

Quote from the Wiseco site
What is Wiseco ArmorGlide skirt coating?
Wiseco ArmorGlide skirt coating is a dry film lubricant applied to the piston skirt. This coating helps reduce friction, improving performance, and will also help quiet the piston in the cylinder bore. This coating is permanently applied, and is not a break in coating, it is on the piston for the life of the part.

C50_1655863_10202314619442349_823908387_n_1390862840 Skerby Quote
4/14/2017 8:24 AM

Let us know when you find out what was causing all this wear. Im interested to find out,

C50 SlS257 Quote
4/16/2017 7:24 AM

Ill tear it apart in another week or two.

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