Aero 125 help

[jwhite2]

Hi all.

First time poster. Just picked up an Aero 125 last week for $200 bucks. Doesn't run but the owner claims it did in January. We'll see. Cleaned out the carb, new spark plug, but nothing happens when trying to start. Then I did a compression test. 50 psi.

So I figure it is time to tear into the cylinder and see what we got. What I found is disgusting. The piston and head look like someone took a hammer and nail to them. All I can figure is little bits of metal chipped off somewhere and the piston just smashed them around. Really gnarled up. Cylinder looks ok but the ports are a little boogered up. Cylinder walls are clean but I am wondering about the ports.

Anyways, where can I get parts for this thing? Cheapcycleparts.com has the cylinder and head but no piston.

Are there any cheaper alternatives to buying a new cylinder, head, and piston? Can a bore fix this and if so, what piston would I buy instead?

Thanks in advance for any help. Ill get a pic of the piston and head once I figure out how to post a picture in these forums.

-J

[Mystic]

I actually remember seeing this aero on little rock CL with a missing side panel at least it has a title but too bad it was all messed up like that maybe you shoulda got the honda helix in cabot

[jwhite2]

Maybe I should have! Couldn't pass up a good deal though. And right in my hometown, just down the street. That rarely happens.

Any suggestions to my previous questions? I would love to see this thing running soon!

-J

[Bear45-70]

All those dings were made by pieces of broken piston ring.

Yes you can bore the cylinder.

You get a piston from Wiseco.

http://www.wiseco.com/

[jwhite2]

If I bore it out do I need a different cylinder head to compensate?

What is the process for boring out a cylinder? I would have a machinist in town do it but I am wondering if it will fix the chipped ports or not. The walls are intact but the ports look a bit suspect. Would the bore fix that?

What would I bore it out to?

Wiseco didn't have nh125 as a model for 1984 Honda scooters. Did I miss something?


Thanks
-J

[Bear45-70]

Sorry you have to use the CR125 piston.

[jwhite2]

The shop manual says the Aero 125 standard bore and stroke are 55x52.4mm. Do I just get the 55.50 piston for the CR125 and bore out to 55.5.

The listed stroke for these pistons is 50mm. Does that affect anything?

Which of the 4 or 5 that pop up would I want?

What else besides boring out the cylinder would I need to do to make this work? Any other machining work?

Thanks. This is a world of great wealth that I don't have access to through my hometown. I took my Aero 125 up to our Honda dealer for an inspection to see if they could fix it and the guy gave me all this junk about age and parts, etc. I WILL get this bike running.

-J

[Bear45-70]

The shop manual says the Aero 125 standard bore and stroke are 55x52.4mm. Do I just get the 55.50 piston for the CR125 and bore out to 55.5. Yes

The listed stroke for these pistons is 50mm. Does that affect anything? NO

Which of the 4 or 5 that pop up would I want? The on closest to the stock bore and the closest year.

What else besides boring out the cylinder would I need to do to make this work? Any other machining work? Make sure the ports get chamfered after boring and honing.

Thanks. This is a world of great wealth that I don't have access to through my hometown. I took my Aero 125 up to our Honda dealer for an inspection to see if they could fix it and the guy gave me all this junk about age and parts, etc. I WILL get this bike running. Honda does not support vehicles this old, even though some parts are sill available.

-J

[jwhite2]

Does this require a new cylinder head for the new piston size? If so, where would I get one?

Thanks,
-J

[Bear45-70]

Does this require a new cylinder head for the new piston size? If so, where would I get one?

Thanks,
-J

No, just some minor machine work.

[jwhite2]

So the head needs to come with me then. I take it any machine shop that works on powersports will know to do the head as well.

Anyone know where to get gaskets for all this stuff?

Thanks

-J

[Bear45-70]

So the head needs to come with me then. I take it any machine shop that works on powersports will know to do the head as well.

Anyone know where to get gaskets for all this stuff?

Thanks

-J

You want a good knowledgeable 2 stroke machinist.

Gaskets are easy.

Top end set

http://www.ebay.com/itm/390383746010?ss ... 1438.l2649

Complete gasket set

http://www.ebay.com/itm/230134795622?ss ... 1438.l2649

Oh and here is a NH125 piston kit.

http://www.ebay.com/itm/290696609458?ss ... 1438.l2649

Oh and get the piston first so he can match the bore to the piston.

[jwhite2]

Will the piston you linked work? It says something about a Suzuki. Thanks again by the way for all this help. It really is appreciated so much!

If I am getting the cylinder head bored as well, would it hurt to go with an ebay used head? A new one is $75. I hesitate not to go ahead and spend that money since it is one of the few parts I can purchase new. But money is always tight so any I can save is good.

So whats my next step after bore and hone? Will the newly bored cylinder, piston, and head all just bolt right on and work? Anything else I should be thinking about/ ordering?

I am in the market for a carb for this thing. The one that came on it was not the stock one. A previous owner welded together some odd adapter to make the carb work. It ran at one point so I may just see how it works before I replace it.

Thanks

-J

[Bear45-70]

Will the piston you linked work? It says something about a Suzuki. Thanks again by the way for all this help. It really is appreciated so much! Yes, it will work as the Suzuki piston is the same as the Aero 125 piston (X 2 = 250)

If I am getting the cylinder head bored as well, would it hurt to go with an ebay used head? A new one is $75. I hesitate not to go ahead and spend that money since it is one of the few parts I can purchase new. But money is always tight so any I can save is good. If your head is dinged up then get a used head. You do not bore the head, you just have the guy make sure it is flat so it seals properly.

So whats my next step after bore and hone? Will the newly bored cylinder, piston, and head all just bolt right on and work? Anything else I should be thinking about/ ordering? Make sure the ports get chamfered. Use lots of 2 stroke oil on the piston pin, the rings, the piston walls and the cylinder walls. Bolt it up but use a torque wrench and at least 3 steps to torque the bolts.

I am in the market for a carb for this thing. The one that came on it was not the stock one. A previous owner welded together some odd adapter to make the carb work. It ran at one point so I may just see how it works before I replace it.
First off it sound like this carb blew your motor up. I have no more spare carbs for the 125 at this point. I do have adapters to install the CT intake with which you can use everything from a 21 mm to a 28 mm OKO carb.
Thanks

-J

[motormike]

Hello jwhite2: I sent you a pm...I've got the original carb set-up complete...