84 Aero 125 project needs help! - Chicagoland Sportbikes
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post #1 of 27 (permalink) Old 08-08-2013, 05:36 PM Thread Starter
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84 Aero 125 project needs help!

.... quick history.... got an 88 Elite, wouldn't stay running, replaced the fuel valve and the bystarter, and it runs like a charm......

I just picked an Aero up about a month ago. I've been tinkering with it, and still can't get it running! It started when I looked at it, but wouldn't stay running. It rode home with me in a trailer for a 3 hour drive, and now it won't even start.

It cranks fine. It holds 100 lbs of compression. The spark appears very weak though. I've even sprayed starter fluid into the carb. Nothing. I've tried swapping some parts from the currently running Elite, but nothing seems to get the Aero to start.

Do you have any ideas??? I know I'm going to replace the fuel valve and most likely the bystarter.... but I'd like to get the darn thing to fire!

Also, if you know of a supplier that has parts, that would be a huge help. I'd like to get this bike running so I can ride it and my grandson can ride the Elite.
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post #2 of 27 (permalink) Old 08-17-2013, 03:30 PM Thread Starter
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update on progress

well, we have now put in some new parts: a coil, a regulator/rectifier, a CDI unit, and a petcock assembly. It still won't start! It did "bang" once when starter fluid was sprayed in the carb....

Ideas? places to locate parts?
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post #3 of 27 (permalink) Old 08-17-2013, 04:23 PM
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Put a brand spanking new spark plug in it. A fouled plug can still make a spark, just not enough to fire the fuel.
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post #4 of 27 (permalink) Old 08-17-2013, 04:51 PM
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I am going to give you a tip that I gave Dave13 on his scooter .


Douse it with gasoline and light it on fire .


Diagnosing things like this over the computer is like me trying to explain what a woman is thinking .
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post #5 of 27 (permalink) Old 08-17-2013, 05:07 PM Thread Starter
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Originally Posted by Dirtbiker View Post
Put a brand spanking new spark plug in it. A fouled plug can still make a spark, just not enough to fire the fuel.
Funny you should mention it, Dirtbiker, but both of the plugs we tried today were brand spanking new ones!

I'm a "technology specialist" as far as computers go, and I have a hard time diagnosing them online, so I know this is a pain in the arse, and I do appreciate any tips. Maybe there is some little step that I forgot or overlooked....
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post #6 of 27 (permalink) Old 08-17-2013, 05:08 PM
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I am going to give you a tip that I gave Dave13 on his scooter .


Douse it with gasoline and light it on fire .


Diagnosing things like this over the computer is like me trying to explain what a woman is thinking .
Very true also. You could toss this one in the nearest body of water and buy one that runs for a few hundred bucks.
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post #7 of 27 (permalink) Old 08-17-2013, 05:12 PM Thread Starter
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hardee har har

Yeah, I know... Throw a match on it, throw it in Lake Huron, drop it off at the landfill. All good ideas, but it should be running!! It is in great shape (for how old it is).

I was just perusing the eBay UK site. The Honda NH 125 Lead was (supposedly) the same bike as this one, but was sold for many more years in Europe.

Now, just gotta figure out what I need to order.... and there lies the rub!
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post #8 of 27 (permalink) Old 08-18-2013, 12:40 AM
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You have to understand that its hard to diagnose issues like this over the computer .
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post #9 of 27 (permalink) Old 08-18-2013, 08:44 AM Thread Starter
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I totally understand!

I also forgot to mention this little nugget of joy.....

The day we looked at it, and fired it up, and it ran for 15 seconds.... the battery was hooked up backwards..... I'm not even sure how that is possible, but that's what happened.

The gentleman told us that the "fuel pump" need replacing. He wanted his car battery back.....

We bought it, hooked up a car battery the right way, and the mysteries ensued.
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post #10 of 27 (permalink) Old 08-18-2013, 09:12 AM
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Is the plug getting wet ? Are your safety switches working ?
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post #11 of 27 (permalink) Old 08-18-2013, 09:19 AM Thread Starter
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Quote:
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Is the plug getting wet ? Are your safety switches working ?
Yep, plug is getting wet. Yes, the scoot won't even crank if the brake pedal is not depressed.
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post #12 of 27 (permalink) Old 08-18-2013, 09:40 AM
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Quote:
Originally Posted by Tanner View Post
Yep, plug is getting wet. Yes, the scoot won't even crank if the brake pedal is not depressed.
While its cranking , if you spray some starting fluid into the carb , does fire up for a moment ?
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post #13 of 27 (permalink) Old 08-18-2013, 08:05 PM Thread Starter
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While its cranking , if you spray some starting fluid into the carb , does fire up for a moment ?
instead of hearing the usual cranking noise, there is one loud bang.
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post #14 of 27 (permalink) Old 08-18-2013, 08:17 PM
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instead of hearing the usual cranking noise, there is one loud bang.
Are you sure its mechanically sound ?
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post #15 of 27 (permalink) Old 08-19-2013, 07:44 AM Thread Starter
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Mechanically sound? The gentleman that we bought it from said it "ran like a charm". He got in an auto accident and was unable to ride for many years, took it out of the garage, and his son was going to ride it, but it would only stay running for 20 seconds at a time. He had a friend that was a mechanic, and his friend told him that it was the "fuel pump". The scoot doesn't have fuel pump, but we did replace the petcock assembly.
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post #16 of 27 (permalink) Old 08-19-2013, 09:02 AM
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compression test?

clean the carb (idle circuit)

new plug

test ign coil for proper resistance readings

-Jason
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post #17 of 27 (permalink) Old 08-19-2013, 10:23 AM
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Sorry for the late reply! My Dad needed parts a couple of seasons ago for theirs - found a shop in Indiana that was really helpful, and able to supply everything. Oddly, the Aero motor shares a lot of parts with the CR125 dirtbikes of the same era.

One big change that they had to do recently to keep theirs running was to bypass whatever mechanism it was that mixed the fuel internally. So now they run pre-mix rather than filling gas / oil separately. Runs great - although it smokes a bit more than it used to.

Good luck with it, my folks bought theirs new in 84 and it's still a ball to ride.


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post #18 of 27 (permalink) Old 08-19-2013, 10:51 AM
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Quote:
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Mechanically sound? The gentleman that we bought it from said it "ran like a charm". He got in an auto accident and was unable to ride for many years, took it out of the garage, and his son was going to ride it, but it would only stay running for 20 seconds at a time. He had a friend that was a mechanic, and his friend told him that it was the "fuel pump". The scoot doesn't have fuel pump, but we did replace the petcock assembly.
Hook everything up correctly ?
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post #19 of 27 (permalink) Old 08-19-2013, 12:28 PM

 
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Crank seals

Gus
We offer three kinds of service @ Resurrection
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You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
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and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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post #20 of 27 (permalink) Old 05-06-2014, 10:24 AM Thread Starter
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Never got it running. Just posted it on Craigslist.
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post #21 of 27 (permalink) Old 05-06-2014, 10:48 AM
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too bad its so far away otherwise might have been interested in buying it

-Jason
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post #22 of 27 (permalink) Old 05-07-2014, 09:57 AM
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too bad its so far away otherwise might have been interested in buying it
Its not like you're busy , go and get it .

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post #23 of 27 (permalink) Old 05-07-2014, 01:17 PM
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hhaha i know right, just a short trip up there

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post #24 of 27 (permalink) Old 05-07-2014, 01:50 PM
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hhaha i know right, just a short trip up there
Bag of shrooms, 8 Ball and the 1st 3 Beastie Boys CDs along with Zeppelin 1 and 2 - Straight shoot it E on 94 till ya hit Windsor and then go to some of the best strip clubs in N America - Hell, I may have just talked myself into this.......

This is where I miss Mopar

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post #25 of 27 (permalink) Old 05-07-2014, 01:52 PM
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If he wants to bring it over the UP to Green Bay, I'll bring it the rest of the way home for you.

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post #26 of 27 (permalink) Old 05-07-2014, 01:57 PM
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If he wants to bring it over the UP to Green Bay, I'll bring it the rest of the way home for you.
Shit - I was thinking the Thumb of the Mitt - Never did just the tip.......

Damn thats a drive - Macinac can be fun on shrooms too though

"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming WOW, what a RIDE !!"

Last edited by Bug; 05-07-2014 at 03:04 PM.
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post #27 of 27 (permalink) Old 05-07-2014, 01:57 PM
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If he wants to bring it over the UP to Green Bay, I'll bring it the rest of the way home for you.
This guy = problem solver.

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