New member from France with a 1986 Aero 50

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Re: New member from France with a 1986 Aero 50

Post by Meatball » Thu May 25, 2017 9:45 am

Like Wheelman111 suggested, I think you should address the issue of the belt not reaching the top of the drive face. Its very possible that the old belt is the culprit. Install the new belt and give it a run and report back. The belt should reach the top of the "ramped" section of the drive face...not 2/3 or 3/4.

Also, 12:1 ratio is not ideal for top speed. Im guessing that youd only see about 37mph with those gears. My AF05 has 10:1 and does 41-ish.
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Re: New member from France with a 1986 Aero 50

Post by cancunia » Thu May 25, 2017 10:22 am

I think I've hijacked this thread a bit too much so have moved onto the other thread I was posting on.

viewtopic.php?f=4&t=27885&p=300050#p300050

Apologies to GSX1400 for the hijack!

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Re: New member from France with a 1986 Aero 50

Post by GSX1400 » Thu May 25, 2017 12:35 pm

I'm following your tracks!

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Re: New member from France with a 1986 Aero 50

Post by GSX1400 » Wed Sep 19, 2018 10:46 am

Hi everybody!
TT was in sleeping mode since end of 2017. I was experiencing carb problems again.
I decided to take it apart today and start working on it.
The carb went to the ultrasonic cleaner (there was a little dust in the bowl) and when I took it out, I didn't pay attention and lost the brass part in which the needle goes up and down! I don't know the name.

Part N°2 here : https://images.cmsnl.com/img/partslists ... d_f26d.gif

NLA on this website. Where in the world am I going to find this???

If you guys would be of some help...
I'm * off with being so careless!

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Re: New member from France with a 1986 Aero 50

Post by GSX1400 » Wed Sep 19, 2018 11:53 am

God of mopeds heard me crying...I just found the lost part (going over the whole place for the 50th time...). It had fallen in the earth and grass between the garage and the backyard where I'm tinkering.

Reassembled the whole carb and still doesn't work well. The spark plug is always humid and the engine dies. I tried full throttle and it dies. It can idle a bit when cold (and electric choke doing the job) but as soon as the choke goes off, the engine starts to lower its idle and dies. The only way to keep it running is to keep opening and closing the throttle all the time. I managed to keep it running jut opening the throttle a bit. That way the engine doesn't die but the rpm's keep going up and down.

WT F word is going on???

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Re: New member from France with a 1986 Aero 50

Post by noiseguy » Thu Sep 20, 2018 10:40 am

What you're describing is a blocked idle jet. Read up here on cleaning them. I'd also suggest a new spark plug if you haven't replaced it recently.
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Re: New member from France with a 1986 Aero 50

Post by GSX1400 » Thu Sep 20, 2018 11:32 am

Am I wrong thinking the idle jet is not removable?
I cleaned the carb in the ultrasonic machine. All the brass came out like new...good cleaning product. But the carb isn't working better.
If the idle jet is clogged up a bit, would the spark plug be wet?
And it doesn't dry quickly. Maybe because of the oil mixed in the gas it stays humide.

I ordered a new auto-choke to test it...
If it doesn't work, I'll do the idle circuit cleaning.

These carbs are troublesome aren't they??? I have never experienced so much problems with a moped or 50cc carb before. I used to pour my gas in the tank and just ride the moped.

EDIT : the NGK BPR 6 HS spark plug has 5000 kilometers on it and the electrodes don't look used. I clean it every 2000 kms or sooner if needed.

I also ordered a new belt Bando/Honda 23100 gn 2 003. Just in case. :| Feeling so lucky.
Same as the one on it and which is the original one, it has 10000 kms and still looks nice, no obvious cracking. I mostly do road trips (20 to 30 kms) out of the city with it = stabilised speed, no stop and go trafic. Hence the low wear I suppose.

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Re: New member from France with a 1986 Aero 50

Post by Wheelman-111 » Thu Sep 20, 2018 1:42 pm

Greetings:

The low-speed "jet" is represented by a small bress stand-pipe alongside the Main jet tower. Not inrended to be removed, but it can be done if you are courageous and careful.

Find a drill bit that fits precisely into the brass pipe. Too big and it won't go in of course. Too small and it will leage a gap which will crush the pipe in Step 2.

1. Insert the drill bit into the pipe.

2. Grasp the brass pipe with a locking long-nose plier. (Vise-Grip.)

3. Pull/Wiggle/Twist rhe brass pipe out of its little socket. It is a light press fit, but the brass is easily deformed.

4. Clean the exposed socket and tiny hole in the carb body. A single bristle plucked from a steel brush has served for me.

5. Soak in carb dip or Spray with carburetor cleaner can until satisfied it is clear of resin.

6. Reinsert reversing the procedure. Hope it is tight enough not to drop out.

Bonne chance!
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Re: New member from France with a 1986 Aero 50

Post by motormike » Thu Sep 20, 2018 3:09 pm

GSX1400 wrote:
Wed Sep 19, 2018 11:53 am
earth and grass between the garage and the backyard where I'm tinkering.
Cardinal RULE: NEVER tinker is the garden with mechanical assembly.
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Re: New member from France with a 1986 Aero 50

Post by noiseguy » Fri Sep 21, 2018 8:33 am

GSX1400 wrote:
Thu Sep 20, 2018 11:32 am
Am I wrong thinking the idle jet is not removable?

I ordered a new auto-choke to test it...
If it doesn't work, I'll do the idle circuit cleaning.

These carbs are troublesome aren't they??? I have never experienced so much problems with a moped or 50cc carb before. I used to pour my gas in the tank and just ride the moped.

EDIT : the NGK BPR 6 HS spark plug has 5000 kilometers on it and the electrodes don't look used. I clean it every 2000 kms or sooner if needed.
Idle jet is not easily removable. Wheelman described how it's done; at worst I use a sewing needle to carefully clear out the jet.

Keep your old auto-choke handy / don't throw it out. The China versions usually are inferior to original, but maybe you get better scooter parts in FR. Wouldn't surprise me.

Your plug needs replaced if it has 5000 km on it. They're cheap and 2 strokes tend to foul plugs.

On that topic; the plug is wet b/c it's oily. You just pulled scooter out from a long rest and I'm betting the bottom end is full of oil. You'll need to run it awhile until it clears out (will also be smoking more than usual if I'm right) and you'll want to replace the plug.

50cc bike ridden regularly have less issues than bikes taken out once a week / month, same as motorcycles and to a lesser extent cars. The oils / seals / gas degrade in storage.
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Re: New member from France with a 1986 Aero 50

Post by motormike » Fri Sep 21, 2018 1:53 pm

noiseguy wrote:
Fri Sep 21, 2018 8:33 am
I use a sewing needle to carefully clear out the jet.
This ALSO is a CARDINAL offense...sewing needles are very brittle and subject to EASILY breaking off while inserted to suspect orifice. THEN, you have a major problem.
I will ALWAYS use my "J & L Jet file" to clean idle jets, and possibly a guitar string in a pinch.
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Re: New member from France with a 1986 Aero 50

Post by noiseguy » Sun Sep 23, 2018 9:22 pm

motormike wrote:
Fri Sep 21, 2018 1:53 pm
This ALSO is a CARDINAL offense...sewing needles are very brittle and subject to EASILY breaking off while inserted to suspect orifice. THEN, you have a major problem.
Totally agree; it's the last attempt b/f I throw the carb out, but would always do this before trying to remove the idle tube in the manner described. I cleaned probably a dozen of these carbs and only needed to needle one of them... the one time I tried it it worked.
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Re: New member from France with a 1986 Aero 50

Post by cancunia » Mon Sep 24, 2018 4:33 am

Just thinking that if the spark plug is wet then maybe there's not enough air going via the idle circuit. How many turns out is the idle jet air screw?

I tend to agree that these carbs can be difficult, I've not been riding my Honda much this year due to messing about on another brand of moped but when I did ride it earlier in the year it cut out twice while cruising along, now there's a definite lag when it's revved. At first I thought it had seized but the starter turned the engine without trouble and after a couple of minutes all was fine apart from the lag when revving. It may be an air lock in the tank but then it would be all the time. Hey ho, next year's Honda voyage of discovery is already mapped out!

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Re: New member from France with a 1986 Aero 50

Post by GSX1400 » Tue Sep 25, 2018 11:49 am

Hi everyone and thanks for your feedback. I didn't get notifications to tell me people answered here...

FYI : When I lost the carb part I was taking the carb from the garage to another place in the garden where I have water to clean it after using cleaning products with the ultrasonic machine.
Lesson learned. Hopefully...

Otherwise, I was experiencing problems before stopping the bike. And at that time I was using it many times a week. So, it isn't the unuse that caused a carb problem.

So :
1st I received my new auto choke (had already changed it 2 years ago at Scooter-Center.com). I tried it. Doesn't work better. Of course you may say.
The new choke looks like someone has tampered around with it, marking it with a screwdriver and as if the C shaped plate had been mounted like when you mount the choke on a carb.
I called them to complain about this. They'll send me another one checking it is ok before sending it out. I am supposing that someone ordered this choke and sent it back for whatever reason and I'm the winner of the day.
The behavior of the carb is similar (read lower) as the old choke. Old choke which may be ok after all!

2nd I am going to have to take the carb apart again. I replaced the reed valves gaskets. Honda NOS. They are ok and I did add a very slim engine gasket sealer (grey one). No air leak now (but I doubt there was any before when I had my home made paper gaskets in there). Changed to make sure.
I also changed the 2 O-Rings on the carb inlet to make sure (NOS Honda too).
I'm assuming there is no air leak.

The air screw is out by 1 turn and 1/4th. As per the shop manual.

I started the engine and it seemed to work ok at cold. When heating up, when the choke ceases action, it dies.
If I try revving it, it dies (so worse than with the old choke which would at least allow me to revv up by cutting and opening throttle).

I tried something then : partially covered the air intake leaving about 2/3 or 50% of the air intake free of obstruction.
Test is without the airbox/filter. Carb is naked.
The engine takes up speed and reachs full speed (on the center stand). Leaving the throttle full open, max revs stabilised, if I take my finger off the intake of the carb, then the engine dies, before stalling, if I put back my fingers it'll go up again.

I feel like there is not enough gas coming in.

I did check, previously, that the choke circuit was ok and that the main jet was free. They were.
The idle jet could cause such a problem?

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Re: New member from France with a 1986 Aero 50

Post by noiseguy » Tue Sep 25, 2018 2:56 pm

Your idle jet is clogged. When you put your hand over the intake like that it's sucking gas through the main jet. You need to clean your carb.
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