Wiseco coating worn off?

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SlS257

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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

BobPA

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3/23/2017 5:03 PM

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

Jason Anderson FTW

SlS257

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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.

ktm-5

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3/23/2017 8:56 PM

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

SlS257

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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

DJS721

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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



Dtat720

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3/25/2017 6:32 AM

SlS257 wrote:

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

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?

Bricktop72

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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.









p

Acidreamer

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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.

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Turbojez

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4/12/2017 6:53 AM

Acidreamer wrote:

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.

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

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SlS257

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4/12/2017 8:28 AM

Bricktop72 wrote:

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.









p



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.

Acidreamer

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4/12/2017 8:46 AM

Acidreamer wrote:

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.

Turbojez wrote:

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

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.

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2002 Suzuki GSXR 600

ohiomotoxer

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4/13/2017 6:04 PM

Quote from the Wiseco site
What is Wiseco ArmorGlide skirt coating?
A.
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.

Skerby

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4/14/2017 8:24 AM

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

SlS257

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4/16/2017 7:24 AM

Ill tear it apart in another week or two.