Namura pistons

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4/12/2018 3:30 PM

Has anyone actually run these in your two stroke? I can get a Namura kit for half the price of Wiseco, and I know you get what you pay for.... usually.

Are these are horrible as the price suggests? Looking to freshen up a 2007 KX250

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Ride like a girl!!!
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2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

4/12/2018 3:43 PM

Very hit or miss. Not as high quality as others. I would suggest buying ANY piston but the Namura.

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If you're not mixing gas, you're not haulin ass.

4/12/2018 5:25 PM

Yup, I just asked the same question a couple of months ago. I was told to avoid them like the plague. Vertex, OEM would be a better choice I’m told.

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4/12/2018 9:11 PM

Depends on how much you like metal shavings. Some people like them, idk.

I dont, so I avoid Namura trash.

Namura- #1 piston choice of Bubba sellin his '85 cr250 on craigslist

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4/12/2018 10:36 PM

This brand definitely has a very short life span in comparison to oem. Best steer clear.

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4/12/2018 11:06 PM
Edited Date/Time: 4/12/2018 11:08 PM

I've ACTUALLY used them before in the past and never had a problem. I got just as much lifespan out of a Namura as any of the other postons I've used (Vertex, Wiseco, OEM). I have a couple buddies use them as well, with no problems. I now run OEM only but I also get a very nice price on them. If I was in a pinch I would have no issues running them again.

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4/13/2018 3:18 AM

Namura is absolute junk. When i was about 17 i bought one because that was what i could afford at the time & didnt know better. Was doing my first top end ever on my 125. My dad put a wiseco in it before then. When i took the old piston out and compared the two i noticed how much weaker of a design the namura was. On top of that it was a cast piston and the wiseco was forged. I decided to return it and went with wiseco. Since then i purchased a yz250. It blew up within 2 hours of owning it. Guess what piston was in it when i took it apart? The namura skirt shattered.

TLDR: go with cp, je, or wiseco.

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4/13/2018 8:43 AM

Put one in my buddies 03 kx 250, only one we could find in the bore that we needed. He does not ride too hard, I defiantly questioned it but it has ran good for over a year now. So we will see. The mechanic I had bore out the cylinder recommended the piston to me says he had decent luck with them. How much is a top end kit really though, if you can get the size you need in another brand I feel like I would do that.

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4/13/2018 1:12 PM

lcgordon711 wrote:

Put one in my buddies 03 kx 250, only one we could find in the bore that we needed. He does not ride too hard, I defiantly ...more

I believe it’s like $40 more for a Wiseco, with gaskets.

I bought a CR125 with one already installed and I ran the piss out of it for about 50 hours. Sold it to a friend for cheap, with the knowledge it has hours on it and he replaced it.

It really depends on whether or not everything else is up to spec and in fantastic condition. I would say they work okay, but they will be the weak link.

Also, a dropped skirt(hah) is more than likely from an oval bore and piston slap.

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If you're not mixing gas, you're not haulin ass.

4/13/2018 5:19 PM

NO NO NO! Complete crap. Circlips made out of safety wire. Save $40 and spend $600. Yeah I know, judros use them everyday with no problems.. You think they are quality and dirt cheap?..........Throw in a Hotrods crank with it if you really want to gamble.......

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4/13/2018 5:26 PM

Tracktor wrote:

NO NO NO! Complete crap. Circlips made out of safety wire. Save $40 and spend $600. Yeah I know, judros use them everyday with ...more

How many hours did your Namura piston last?

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4/13/2018 5:38 PM

Tracktor wrote:

NO NO NO! Complete crap. Circlips made out of safety wire. Save $40 and spend $600. Yeah I know, judros use them everyday with ...more

Ha ha ha! Hot rods crank, or try a Wiseco crank too.
OP just stick an OEM in and you’re GTG.
I bought a top end kit, all OEM for $109.00 for a RM 85.

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4/13/2018 9:07 PM

lcgordon711 wrote:

Put one in my buddies 03 kx 250, only one we could find in the bore that we needed. He does not ride too hard, I defiantly ...more

TrailDigger wrote:

I believe it’s like $40 more for a Wiseco, with gaskets.

I bought a CR125 with one already installed and I ran the piss out ...more

50 hours on a 125 piston? You must not ride very hard...my 125 feels tired after 15

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Tomac and/or Anderson for 2020.....

4/18/2018 12:04 PM

Tracktor wrote:

NO NO NO! Complete crap. Circlips made out of safety wire. Save $40 and spend $600. Yeah I know, judros use them everyday with ...more

40acres wrote:

How many hours did your Namura piston last?

Wasn't mine but a friends bike that another "mechanic" had put the piston in. Made it about 5 hours before destroying piston, cylinder, & head. Also rebuilt bottom end and crank just in case any metal had contaminated the bearings. Bike was a 16 KX85 with about 20hrs on it. Namura was first rebuild...........Not an isolated incident either as I know one time doesn't make a pattern..........

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4/18/2018 12:10 PM

BobPA wrote:

50 hours on a 125 piston? You must not ride very hard...my 125 feels tired after 15

I was 12 when I first got it and sold it when I was 16. Strictly for messing around in the woods and I could start it by hand when I was done with it. Good little bike though, and very resilient. Air filter and oil changes go a long way.

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If you're not mixing gas, you're not haulin ass.

4/18/2018 9:45 PM

Your question comes up every now and then. I wouldn't put one of their pistons in a bike I was giving away. This is a clip of my personal experience:


"They sure as hell wouldn't stand behind their product when 1/8" of a circlip broke off, taking the cylinder and head with it.

From Namura:
"I was able to run this by our warranty staff. What we are willing to do is replace the piston kit. Due to the abnormal nature of this failure, this is all I am authorized to provide."

Wtf! if it was a normal failure they'd have covered the cylinder/head? There were maybe 2-3 tanks of fuel run through the motor, it wasn't some high hour deal. The rest of the circlip stayed in the piston, just about 1/8" of the clip broke off. Metallurgy issue, imo.

They can pound sand."


That's from this thread: https://www.vitalmx.com/forums/Moto-Related,20/Namura-piston,1270951?mobile=false

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4/20/2018 11:41 AM

I ran them HARD in one of my RM250’s and never had a problem with them.... broke the skirt off an oem and pro-x though in the same bike

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4/20/2018 12:11 PM

Lightning78 wrote:

I ran them HARD in one of my RM250’s and never had a problem with them.... broke the skirt off an oem and pro-x though in the ...more

That can be an issue with cast pistons if the bore isn’t completely straight/not oval. Forged pistons can take more abuse.

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If you're not mixing gas, you're not haulin ass.