Scooter Mechanics Help
A couple of years ago, I inherited a 1985 Honda Aero 50 scooter from a friend who had no more use for it. The thing wouldn't start. It was falling apart. Yadda yadda yadda.
After letting it sit in my garage for a couple of years, I finally decided to get it running again. I replaced the battery and then siphoned out all the old gas (although, in retrospect, I should have run it dry) and replaced it fresh. It would *try* to turn over but just wouldn't quite make it. I took it apart and sprayed some starter fluid into the air intake/carb and it started up just fine, ran for a bit, and then died.
I replaced the two vacuum lines going to the carb, and it ran like a top all day today. Started every time.
Just a bit ago (about 9:30 pm) I tried to start it to no avail. The thing just does not like to be cold. And by cold I don't mean a cold engine. I mean an outdoor temp of below 60. Honestly, it acts like there's something wrong with the chokebut I don't *see* a choke on it.
This is, apparently, a long-time problem with this scooter. One of the previous owners drilled a hole through the outer shell, the cover for the air filter, and the filter itself so they could spray starter fluid in to get it started.
At this point, there seem to be two likely candidates for repair: the fuel filter/pump thingy attached to the bottom of the gas tank (I'm not sure *what* it is) and the carb.
Does anyone have any ideas about what might be going on? Anyone have any experience with one of these? The thing runs great (well, acceleration isn't as smooth as it should be, but 85% of the time it does what it oughta) and will be used to get me from home to work (about 3 miles on back roads).
ADDITIONALLY:
Anyone have any ideas about how I might mount a cupholder on this? I like to stop by the 7-11 and grab a cup of coffee in the mornings.
[1964 byte] By [
midwinter] at [2007-11-16 2:55:02]

# 1 Re: Scooter Mechanics Help
I would replace the ignition system on principle. I'll also guess that condensation is getting into the system. If it's all wet before you start to turn it over then it could take a while to clear.
mydo at 2007-11-17 15:23:43 >

# 2 Re: Scooter Mechanics Help
this could be a fuel pump issue...
# 3 Re: Scooter Mechanics Help
this could be a fuel pump issue...
That's what I'm leaning towards at this point. The thing was a real bitch to crank this morning, and I wound up having to squirt some starter fluid in there to get it going. But once it cranked, it ran fine. This is the first day I've taken it to work, so we'll see how it cranks at 5:00 when I leave. I should admit that I have some serious MacGuyverissitude going on with this thing.
The real problem, now, is that I don't know where the fuel pump *is* on this thing. I assume that it's the piece connected directly to the bottom of the tank, which would suggest it's some kind of vacuum driven thing.
Does anyone know what that part might be? I'll gladly take a pic and post it if it'll help.
# 4 Re: Scooter Mechanics Help
I'm going to guess that the pump is mechanical and attached to the engine. Follow the fuel line form the carb' backward.
mydo at 2007-11-17 15:26:47 >

# 5 Re: Scooter Mechanics Help
I'm going to guess that the pump is mechanical and attached to the engine. Follow the fuel line form the carb' backward.
There are two vacuum fuel lines going off the carb, and both go to this little mystery part. But the mystery part is just screwed into the bottom of the tank and isn't attached to anything else.
# 6 Re: Scooter Mechanics Help
Maybe it doesn't have a fuelpump..
# 7 Re: Scooter Mechanics Help
Well, it cranked up just fine after sitting idle at work (in the sun) for 5 hours. It has a little trouble idling after it's been cranked, but once it warms up a little it plugs right along.
So. Carb cleaner? Or would that potentially loosen up the gunk enough to clog the lines completely? Just run it for a couple of weeks and see if it gets any better? Pull the carb and clean it myself?
Anyone have any thoughts?
# 8 Re: Scooter Mechanics Help
Ahem... I found a website that allows one to purchase a service manual for the aero...
just do a little google searching...
# 9 Re: Scooter Mechanics Help
Ahem... I found a website that allows one to purchase a service manual for the aero...
just do a little google searching...
Sure. I have it bookmarked one some site called "Amazon." But COME ON! Having a MANUAL really takes the fun out of it!
# 10 Re: Scooter Mechanics Help
Amazon?
Really? That's a stupid name for a website for scooter manuals...
# 11 Re: Scooter Mechanics Help
Amazon?
Really? That's a stupid name for a website for scooter manuals...
No kidding. I think they might have started out selling canoe service and repair manuals and maybe branched out or something. ;)
# 12 Re: Scooter Mechanics Help
http://www.clubnozza.com/stuff/your_new_wheels.jpg
# 13 Re: Scooter Mechanics Help
Someone online told me that he had the same problem I do; the fuel jet in the carb gets gunked up and needs cleaning. So I took the carb off today and gave it a thorough cleaning. The jet and carb actually looked pretty clean, though. It seems to idle better after the cleaning, as well (even my wife said it sounded better). After sitting idle for 4 hours, it cranked instantly just now. I'll know more in the morning.
Here's what's hysterical, though: the plug wire and coil are one piece. At some point, the plug wire got separated from the coil. Did they fix it by spending $50 on a new assembly? Nooooooooooooo. THEY JB WELDED THE WIRE TO THE COIL.
Ugh.
So that's my purchase for tomorrow.
# 14 Re: Scooter Mechanics Help
I think I've narrowed it down to the petcock valve.
Petcock.
I will never, ever tire of saying that word.
# 15 Re: Scooter Mechanics Help
Took the cylinder apart on Friday. Piston rings had gone bad. New ones on the way! $25!