The soloution to my NH125 Carburator Choke Problems

Aero 125, Elite 125, Elite 150, SH150i, Elite 250, Helix, Big Ruckus, Reflex, Silverwing and PCX 125 / 150, Forza
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JVDS
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The soloution to my NH125 Carburator Choke Problems

Post by JVDS »

Looking for a carb for an aero 125 is impossible, so I found one that was close enough and sure enough ended up being a nearly drop in fit, including the throttle slide. I had to get some slightly longer bolts to attach it to the intake manifold, and I also had to take the heat gun to the airbox to put a VERY slight bend to allow the choke arm some clearance. Other than that I just drilled a hole in the plastic under the seat for the choke cable and everything bolted together. The carburetor was a "PZ25" carburetor off the fleabay and the choke cable I found that would fit was a "GOOFIT 30.12" Hand Choke Cable" as seen in the screenshots in the attachments. I did have to put some heat shrink tube around the end of the choke cable to give that little clamp on the carburetor the proper grip to keep it from sliding out. I have attached a few pictures showing the location I placed the choke pull. Otherwise all It took was a bit of messing around with the idle and fuel screw to get it to run nicely but I'm getting the same power out of this carb as I did from the original.
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flybd5_juan
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Re: The soloution to my NH125 Carburator Choke Problems

Post by flybd5_juan »

In the early 1990's Honda bought a controlling stake in the Peugeot scooter company. The same engine that's on the Aero 125 (and European Lead 125) is on the Peugeot SR 125 and SV 125 scooters. I know because I swapped one of those for mine and it works perfectly. It was essentially a drop-in install, gave new life to my tired scooter. What that means is that finding carbs is not impossible, it just takes a bit of legwork. A bunch of the SR and SV 125's were sold, and virtually all the engine and drivetrain parts are interchangeable. Once in a while you can even find complete engine packs with air filter and carb, like this.

https://www.ebay.co.uk/itm/Peugeot-SV12 ... 3865854896

...but you have to take the time to look.
A black hole marks the spot <insert imaginary deity here> divided by zero.
JVDS
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Re: The soloution to my NH125 Carburator Choke Problems

Post by JVDS »

flybd5_juan wrote: Thu May 07, 2020 9:02 am In the early 1990's Honda bought a controlling stake in the Peugeot scooter company. The same engine that's on the Aero 125 (and European Lead 125) is on the Peugeot SR 125 and SV 125 scooters. I know because I swapped one of those for mine and it works perfectly. It was essentially a drop-in install, gave new life to my tired scooter. What that means is that finding carbs is not impossible, it just takes a bit of legwork. A bunch of the SR and SV 125's were sold, and virtually all the parts are interchangeable. Once in a while you can even find complete engine packs with air filter and carb, like this.

https://www.ebay.co.uk/itm/Peugeot-SV12 ... 3865854896

...but you have to take the time to look.
Good information, Thank you.
MinnesotaAero
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Re: The soloution to my NH125 Carburator Choke Problems

Post by MinnesotaAero »

Can confirm the PZ25 China carb works like a charm. Just did the install tonight and night and day difference. The old carb I couldnt' get tuned in and swapped the PZ25 in. Bought on Amazon and arrived less than a week later.

KDSG PZ25 25MM Carburetor with Hand Choke for 70cc 90cc 100cc 110cc 125cc 4 Stroke ATV Moped Quad Dirt Pit Bike Go Kart Scooter Honda XR50 XR50R CRF50 CRF50F

30 USD. Can't beat it!
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Re: The soloution to my NH125 Carburator Choke Problems

Post by Goofaroo »

I’m in the process of doing this conversion. I’m waiting on the choke cable but I have the air box clearance taken care of and mounted the carb. So far I have been impressed. I hooked the new slide to the factory cable and it bolted right up to the intake with no need for longer bolts. I adjusted the idle and air mixture and it seemed to respond well to adjustments. It starts easily and seems to have much snappier throttle response and idles very cleanly. I’ll report back when I get it finished but I am waiting on the cable and some new variator rollers. I also need to service the clutch.

So far this looks like a great fix for very little money or effort. Thanks for posting!
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Re: The soloution to my NH125 Carburator Choke Problems

Post by Goofaroo »

First test drive was not what I had hoped for. It idled nicely and seems to rev a bit quicker with no load but I tried to ride it and it seems gutless. I adjusted the air mixture to a variety of positions and it still falls flat in the mid range and basically just falls completely flat at full throttle.

Did you guys use the carb as it was right out of the box or did you swap the factory jets, slide, and emulsion tube from the original carb into the new one? I think that’ll be my next course of action.
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Re: The soloution to my NH125 Carburator Choke Problems

Post by flybd5_juan »

That doesn't sound like the carb, that sounds like the variator weights. What size weights do you have in there? They are supposed to be between 19g and 21g.
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Re: The soloution to my NH125 Carburator Choke Problems

Post by Goofaroo »

18 gram rollers. I was running 19 gram sliders but I never liked them.

I could be wrong but it sure seems like a carb issue. It just falls on it’s face at certain throttle positions. Adjusting the air mixture does influence it but it’s not even close to running out as it should.
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Re: The soloution to my NH125 Carburator Choke Problems

Post by Goofaroo »

I just put it back on a lift and fired it up and even with the rear wheel off the ground it was hitting a flat spot. Turning the air mixture out a few turns made it more responsive but nothing like it seemed yesterday. I have no idea what changed but it certainly isn’t revving as quickly as it was. When I get a chance I’ll throw the factory carb back on and take it for a spin just to verify that it’s not the rollers causing this. It has always ran fine on the factory carb. I was just trying to cure the hard starting.
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Re: The soloution to my NH125 Carburator Choke Problems

Post by Goofaroo »

Finally got a chance to work on it this morning.

I made a few more attempts at tuning the new carb but it wasn’t having any. I was also suspicious that the needle wasn’t sealing and the fuel level was too high but it bench tested fine. So I pulled the carb off and compared it closely to the original. One thing I was hoping was that the original bowl would fit the new carb but they are different. Be aware that the bowl drain screw an hose are on the wrong side of the bowl to be usable on the new carb.

In a last ditch effort I installed the factory slide and needle, emulsion tube, and both jets into the new carb. It ran better but certainly not as it should.

I decided to go back to stock just to eliminate that it could be something other than a carb issue. I put the factory carb back together and it was slow to start but runs great just like it always has. It seemed a bit peppier off the line with the 18 gram rollers and I had also serviced the clutch. The transmission is much smoother and quieter now.

I’m all ears if the OP and the other member that reported good results have any input. Did you do any mods to this carb that you didn’t mention?

Anyhow, I am calling it a success. I had it in my shop for driveline maintenance. It’s fixed and I will just ride it like I always have.
Last edited by Goofaroo on Wed Jul 22, 2020 12:32 pm, edited 1 time in total.
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Re: The soloution to my NH125 Carburator Choke Problems

Post by Goofaroo »

The “before” pic.  lol
The “before” pic. lol
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As she sits.
As she sits.
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markbrad
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Re: The soloution to my NH125 Carburator Choke Problems

Post by markbrad »

So I did this modification with the carb and choke cable and changed the main jet from an 80 to an 84 and moved the needle down (richer) one slot. How do you think the plug looks after a short run?
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