Vino 125 Sputters and Dies, but Carb Seems OK

[garicao]

Hi...I’m wondering if someone can point me in the right direction with a 2006 vino 125 problem. Bike has 3400 miles and looks fine, but I don’t know its history.

Problem: bike normally runs well but recently started sputtering and often (but not always) dies while running. It will restart, but then usually dies again. I thought this was a fuel/air rather than ignition issue because blipping the throttle sometimes revives the motor. It’s worst when coming to a stop, but occurs at other throttle openings.

The stock plug looks fine (tho gap was slightly wide; I reset it to .028”). There seem to be no air leaks (based on spraying carb cleaner around connections and hoses). I drained the carb; fuel came out clean and without water. The air filter is fine. Still ran badly.

Fuel flow from the vacuum petcock was good, so I pulled the carb. It was pristine: no dirt, no water, no gunk in the float bowl. Having gone this far, I disassembled it and blew out all the jets and passageways (but didn’t disassemble the electric choke or accelerator pump) and checked float level. Everything looked good.

Any ideas?

Thanks!

--garicao

"We're lost, but we're making good time."

[j~scoot]

What is your elevation? Have you noticed that it does it during certain times? Like does it happen after the bike warms up, when its still cold?

You said it happens when you stock so it seems to me like it could be your idle screw isn't properly adjusted allowing the scooter to get bogged down.

[garicao]

What is your elevation?

==Sea level.

Have you noticed that it does it during certain times? Like does it happen after the bike warms up, when its still cold?

==Sometimes hot, sometimes cold ("sometimes in the pot, nine days old." 8^). And sometimes not at all.


You said it happens when you stock so it seems to me like it could be your idle screw isn't properly adjusted allowing the scooter to get bogged down.

==Idle screw's untouched. The intermittent nature of the problem suggests (now that the carb is unlikely to be the culprit, imo) an ignition problem...maybe. But I don't see how ignition gremlins would get better on blipping the throttle....

===Anyone seen this with a cdi, pulser/pickup coil, or ignition coil going bad?

==Thanks.

[zeonsredcomet]

Just change the spark plug out and let us know. Sometimes electrodes go bad and thats just that.

Let us know after you do that lets take this as a step by step process

What fuel are you running? run the highest octane that you can because that does make a difference big time!
Run quality oil too just because go full synthetic. Let us know after you change the Plug