OEM or Wiseco?

Muscle-Milk-KTM
Edited Date/Time 1/29/2018 5:00pm
Gonna put a new piston in my YZ125 but not sure what one to put in it? OEM or Wiseco?


|
Rohr144
Profile picture for user Rohr144
Posts
236
Joined
10/17/2017
Location
Wentzville, MO US
Rohr144 1/25/2018 10:28pm
1/25/2018 10:28pm
Ive used Wiseco pistons and Vertex pistons, and I have a Wiseco in my Yz125 right now, no complaints about it. Use a good quality premix oil and either brand of piston will work good.
crc245
Profile picture for user crc245
Posts
1088
Joined
10/29/2007
Location
Yorba Linda, CA US
crc245 1/25/2018 10:31pm
1/25/2018 10:31pm
OEM or ProX for me, but that's just what I've had great luck with! I'm sure you'll hear a variety of opinions, so take each for what they're worth. Best of Luck and enjoy ripping that YZinger Cool
Acidreamer
Profile picture for user Acidreamer
Posts
1794
Joined
8/25/2015
Location
Mansfield, OH US
Acidreamer 1/26/2018 4:19am
1/26/2018 4:19am
wiseco pistons are one of those things that are better than oem. Not that oem is bad by any means but a forged piston is going to be stronger and more durable than a cast one. Top end hours can be extender

The Shop

See All »
motomike894
Profile picture for user motomike894
Posts
1496
Joined
9/6/2009
Location
Waterloo, IN US
motomike894 1/26/2018 5:13am
1/26/2018 5:13am
In my two strokes I always used Pro X with no issues, sometimes OEM, the cast pistons seem to hold up better in my experience.
mattyhamz2
Profile picture for user mattyhamz2
Posts
10866
Joined
7/6/2015
Location
So Cal, CA US
Fantasy
767th
mattyhamz2 1/26/2018 7:43am
1/26/2018 7:43am
crc245 wrote:
OEM or ProX for me, but that's just what I've had great luck with! I'm sure you'll hear a variety of opinions, so take each for...
OEM or ProX for me, but that's just what I've had great luck with! I'm sure you'll hear a variety of opinions, so take each for what they're worth. Best of Luck and enjoy ripping that YZinger Cool
x2
Zesiger 112
Profile picture for user Zesiger 112
Posts
2197
Joined
3/4/2013
Location
Pink Hill, NC US
Fantasy
2020th
Zesiger 112 1/26/2018 8:15am
1/26/2018 8:15am Edited Date/Time 1/26/2018 8:17am
I rebuilt a yz125 with a pro-x piston, ran good for me 5-6 rides. Sold it and within a few weeks 1-2 rides the guy said it shattered into pieces.
Don't read into that as poor quality, he may have sucked dirt or water into it, he was new and liked to ride at atv parks. I've seen another one do the same thing because of a hole in the air filter.
Tracktor
Profile picture for user Tracktor
Posts
2344
Joined
8/17/2006
Location
The RTF/Amboy, WA US
Tracktor 1/26/2018 9:02am
1/26/2018 9:02am
As long as it isn't a Namura you should be fine. I've ran every brand out there at one time or another and haven;t seen a piston related failure in years. I think the advent of plated cylinders helped a bunch in piston life...........expansion rates and such
BobPA
Profile picture for user BobPA
Posts
8027
Joined
10/31/2013
Location
PA US
BobPA 1/26/2018 9:21am
1/26/2018 9:21am
motomike894 wrote:
In my two strokes I always used Pro X with no issues, sometimes OEM, the cast pistons seem to hold up better in my experience.
I will never run a cast piston in my two stroke. Have seen too many shatter like glass. They are fine if changed often, but lead to catastrophe if not changed on a strict interval.

There is a reason all high horsepower applications use forged...
motomike894
Profile picture for user motomike894
Posts
1496
Joined
9/6/2009
Location
Waterloo, IN US
motomike894 1/26/2018 9:42am
1/26/2018 9:42am
motomike894 wrote:
In my two strokes I always used Pro X with no issues, sometimes OEM, the cast pistons seem to hold up better in my experience.
BobPA wrote:
I will never run a cast piston in my two stroke. Have seen too many shatter like glass. They are fine if changed often, but lead...
I will never run a cast piston in my two stroke. Have seen too many shatter like glass. They are fine if changed often, but lead to catastrophe if not changed on a strict interval.

There is a reason all high horsepower applications use forged...
That's weird I have never had that issue in my life, maybe I just got lucky I guess, I never had an issue with a forged one either I have had to use them a few times when Pro X didn't have one in stock.

Jake_CR250R
Profile picture for user Jake_CR250R
Posts
320
Joined
1/30/2012
Location
Ozark, MO US
Jake_CR250R 1/26/2018 3:27pm
1/26/2018 3:27pm
Honestly now days any reputable brand will be fine (i.e. avoid namura). I still prefer to stick to oem or prox though.
kzizok
Profile picture for user kzizok
Posts
8393
Joined
10/19/2010
Location
AS US
Fantasy
2034th
kzizok 1/26/2018 5:12pm
1/26/2018 5:12pm
crc245 wrote:
OEM or ProX for me, but that's just what I've had great luck with! I'm sure you'll hear a variety of opinions, so take each for...
OEM or ProX for me, but that's just what I've had great luck with! I'm sure you'll hear a variety of opinions, so take each for what they're worth. Best of Luck and enjoy ripping that YZinger Cool
Aren’t they the same thing?
crc245
Profile picture for user crc245
Posts
1088
Joined
10/29/2007
Location
Yorba Linda, CA US
crc245 1/26/2018 8:09pm
1/26/2018 8:09pm
crc245 wrote:
OEM or ProX for me, but that's just what I've had great luck with! I'm sure you'll hear a variety of opinions, so take each for...
OEM or ProX for me, but that's just what I've had great luck with! I'm sure you'll hear a variety of opinions, so take each for what they're worth. Best of Luck and enjoy ripping that YZinger Cool
kzizok wrote:
Aren’t they the same thing?
I believe so, just depends whichever I can get cheaper at the time!
YamahaJT1
Profile picture for user YamahaJT1
Posts
1232
Joined
3/17/2015
Location
VA US
YamahaJT1 1/27/2018 5:08pm
1/27/2018 5:08pm Edited Date/Time 1/27/2018 5:53pm
I've had good results with cast Vertex "B" in Honda "A" cylinders on CR125R units... But I change them at roughly 20-25 hours and I am fat and slow. Done this twice. I have used the Vertex "STD" and "Race" 53.93 pistons with equal success. Bore/ring end gap/squish were GTG. They look great when I toss them. Here is a new Vertex "Race" unit, IIRC. A bit different than the all-over grey/gray coated Vertex "STD":




Next up is a Wiseco "Racer Elite" for latest (Re)build. Of course, measuring fitment is key, but Wiseco isn't "garbage" by any means if you measure/fit/adjust accordingly. Cast or forged, warm 'em up good before you roll out hard, always.

Additionally, clean up your shit before you open and work on the guts. I have seen so many "Woe is me" threads wondering why a simple piston replacement on a filthy unit "ruined my engine"


chump6784
Profile picture for user chump6784
Posts
1690
Joined
5/9/2011
Location
AU
chump6784 1/27/2018 5:25pm
1/27/2018 5:25pm
Either are fine. You can get more hours out of a forged piston but on a 125 you will want to keep the rings fresh anyway. Any piston should be changed every second set of rings.
I usually run pro x pistons in both my wifes yz 125 and my yz 250. Just can't push the intervals on the 250 with a cast piston as far as a forged one will go
mxbrian15
Profile picture for user mxbrian15
Posts
533
Joined
12/8/2015
Location
Orlando, FL US
mxbrian15 1/28/2018 7:57am
1/28/2018 7:57am
Vertex for me. Have gone 80+ hours on them on a 300xc multiple times with no issues whatsoever. I have never had issues with Wiseco either.m, but have more experience with Vertex.

Pit Row

See All »
Rockinar
Profile picture for user Rockinar
Posts
1064
Joined
9/16/2016
Location
Katy, TX US
Rockinar 1/29/2018 2:05am
1/29/2018 2:05am
Zesiger 112 wrote:
I rebuilt a yz125 with a pro-x piston, ran good for me 5-6 rides. Sold it and within a few weeks 1-2 rides the guy said...
I rebuilt a yz125 with a pro-x piston, ran good for me 5-6 rides. Sold it and within a few weeks 1-2 rides the guy said it shattered into pieces.
Don't read into that as poor quality, he may have sucked dirt or water into it, he was new and liked to ride at atv parks. I've seen another one do the same thing because of a hole in the air filter.
The problem with these stories is you dont know why it shattered. Most likely mechanic error or just pure abuse or neglect or some sort.
ohiomotoxer
Profile picture for user ohiomotoxer
Posts
464
Joined
2/12/2017
Location
Cleveland, OH US
ohiomotoxer 1/29/2018 5:00pm
1/29/2018 5:00pm
I used to work at wiseco, great place, great people, great product made here in Ohio.
Nuff said

Post a reply to: OEM or Wiseco?