NH125 Piston replacement

Aero 125, Elite 125, Elite 150, SH150i, Elite 250, Helix, Big Ruckus, Reflex, Silverwing and PCX 125 / 150, Forza
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Mileslord
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NH125 Piston replacement

Post by Mileslord » Thu Feb 09, 2017 6:52 pm

I am have ordered a GT250 X7 Mitaka Piston from PJ Motorcycle engineers. From what I have read and researched this should be a viable replacement piston. I will post more when I receive it.
-Miles
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'84 Aero 125 in Hugger Orange
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Re: NH125 Piston replacement

Post by donny » Fri Feb 10, 2017 4:22 pm

Hi that will be interesting, the list of scooters you know what you are doing. Nice rides 8-)
presently enjoy riding a Ruckus and a Super 9. Tinkering with a Riva 180 and a couple of old Puch SV's. In the off season I enjoy a 1999 Polaris Indy 600 XLT Touring and a 2014 Artic Cat Prowler side by side

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Re: NH125 Piston replacement

Post by tyler vr » Mon Feb 13, 2017 10:03 pm

Any info about a replacement piston nh125 would be great, keep us updated. :D

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Re: NH125 Piston replacement

Post by Florida Antique » Wed Feb 15, 2017 12:10 pm

Tyler,
There is a guy in England that has replacement oversize pistons for NH 125 engines, He advertises them on Ebay. From what I understand they are Taiwanese made and not bad quality but the rings are a little soft. The piston in my bike was replaced with a Weisco piston for a CR125. Because the ring stops are in the wrong location they had to send the piston and cylinder out and have the piston re-indexed. From what I understand, this is a common practice in outboard motor racing. Once the piston was re-indexed and installed and broke in properly it ran fine. That would probably be a viable alternative to a factory piston which is NLA.
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Re: NH125 Piston replacement

Post by tyler vr » Sun Feb 19, 2017 10:24 pm

Florida Antique wrote:Tyler,
There is a guy in England that has replacement oversize pistons for NH 125 engines, He advertises them on Ebay. From what I understand they are Taiwanese made and not bad quality but the rings are a little soft. The piston in my bike was replaced with a Weisco piston for a CR125. Because the ring stops are in the wrong location they had to send the piston and cylinder out and have the piston re-indexed. From what I understand, this is a common practice in outboard motor racing. Once the piston was re-indexed and installed and broke in properly it ran fine. That would probably be a viable alternative to a factory piston which is NLA.
Good info, thanks. I remember reading something on the forum about changing the ring stop location on a replacement nh125 piston. I hope Mileslord follows up about fitting this GT250 X7 Mitaka Piston to the nh125, hope it works out. :)

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Re: NH125 Piston replacement

Post by Mileslord » Fri Mar 03, 2017 3:51 pm

I got the piston today from PJ Motorcycle Engineers.

the ring pins are in the correct spot
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Now off to Bill Bune http://billbune.com/ for the machine work
'84 Aero 125 in Grabber Green
'84 Aero 125 in Hugger Orange
'84 Aero 125 -current build
'02 Metropolitan
'06 Metropolitan
'02 Metropolitan GY6 swap - build in progress
'06 Stella 2T - daily ride
'08 Buddy 125

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Re: NH125 Piston replacement

Post by tyler vr » Mon Mar 20, 2017 2:47 pm

Nice!

Is the replacement piston oversized?

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Re: NH125 Piston replacement

Post by Mileslord » Tue Mar 21, 2017 3:32 pm

Yes, it is a 56mm 2.0 oversize piston.
have not gotten to the machine shop yet, tranny went out on my van so that has been the object of my attention lately.
'84 Aero 125 in Grabber Green
'84 Aero 125 in Hugger Orange
'84 Aero 125 -current build
'02 Metropolitan
'06 Metropolitan
'02 Metropolitan GY6 swap - build in progress
'06 Stella 2T - daily ride
'08 Buddy 125

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Re: NH125 Piston replacement

Post by ghalperin » Thu May 09, 2019 3:09 pm

Do you happen to have a part number and application for the 56mm piston?

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Re: NH125 Piston replacement

Post by flybd5_juan » Sat May 11, 2019 3:57 pm

ghalperin wrote:
Thu May 09, 2019 3:09 pm
Do you happen to have a part number and application for the 56mm piston?
The Peugeot SR and SV 125 both use the Honda engines. Barikit has the correct size piston for the 125, part number P-264. 55mm.
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Re: NH125 Piston replacement

Post by ErikBuzzard » Tue Oct 29, 2019 1:04 pm

Mileslord wrote:
Tue Mar 21, 2017 3:32 pm
Yes, it is a 56mm 2.0 oversize piston.
have not gotten to the machine shop yet, tranny went out on my van so that has been the object of my attention lately.
Any word on this? Did it work? I just seized my aero. Looking into more options than the 140 replacement piston

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Re: NH125 Piston replacement

Post by ghalperin » Tue Oct 29, 2019 1:18 pm

I just ordered one on eBay from England. My machine shop had to trim the skirts, but it’ll work.

Suzuki GT250 GT 250 X7 M/A 56.00mm Bore Piston Kit Also RG250 GT380 (OVERSIZE)
https://www.ebay.com/itm/Suzuki-GT250- ... 2749.l2649

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Re: NH125 Piston replacement

Post by ErikBuzzard » Sat Nov 09, 2019 12:12 am

ghalperin wrote:
Tue Oct 29, 2019 1:18 pm
I just ordered one on eBay from England. My machine shop had to trim the skirts, but it’ll work.

Suzuki GT250 GT 250 X7 M/A 56.00mm Bore Piston Kit Also RG250 GT380 (OVERSIZE)
https://www.ebay.com/itm/Suzuki-GT250- ... 2749.l2649
How well does it run? Have you ran into any issues?

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Re: NH125 Piston replacement

Post by ErikBuzzard » Thu Dec 05, 2019 6:23 pm

I ordered the same piston. Just got it today! Gonna take the cylinder to the machine shop soon! Christmas is around the corner so my money is tied up lol. I have a polini scooter pipe made for piaggio that I'm gonna hack and weld. I want to get a new carburetor any suggestions?!

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