Drove me nuts By deepcrk06 (Read 430 times)

[deepcrk06]

was out riding scoot, 50cc 139qmb, having a great day, then it dies.

pulled to side of road, scoot fired right up idle great, gave it some gas and it died again.

hit starter and fires right up again, good idle

give it gas and it dies again

call home and get wife to bring truck to get me home.

at home, i check for gas, full tank
replaced fuel filter
start scooter and fires right up and idle great
give it gas and it dies.....

replaced spark plug, same prob
replaced carb with new one, same prob
checked valves, .003 on both, all good, same prob

scratch my head and go get coffee....

decide to check electrical ....

replaced cdi, bike fires up and runs great, take for ride no problems

put old cdi back on, fires up and give it gas and it dies

threw old cdi away and put on new one and all is Good

anyone else ever have a cdi act like this?

I was sure it was a fuel problem.

happy it running and so is wife... lol

[wutzthedeal]

I'm an electronics type (not a motor guy) and that sounds very odd for an electrical component to suddenly affect something so bad that that would happen (I presume what happened is the ignition timing slowed and you kept getting flooding, or something along those lines). Usually, in electronics, we have what's called zinged and zapped. Zapped is fried. Zinged just causes trace or component damage and begins giving you intermittent problems until it finally fails fully, but if your CDI had fried, the system would have never allowed you to start and idle. Are you sure you didn't replace anything recently and mess with wires or go through water? Or something strange like that that could have done some light damage? Maybe really heavy bumps?

[dippy51]

My 50cc scooter had the same symptoms. It sputtered going down the road then died. Would start up and idle fine but die if given throttle or pushed off the center stand. After several attempts i ended up pushing it home. I drained the carb bowl, filled the tank with fresh gas and problem was fixed. Been good for a 2 months now.

[deepcrk06]

I understand that with electronics most of the time it either works or it don't. But the cdi i had worked fine at idle, but not when increasing revs. I tried it 3 times with same results. Prior to this problem, scooter ran great with no troubles and no I had not touched anything or changed anything and have not ridden threw water or rough roads. All I know is for sure, after changing the cdi everything is back to normal and running fine once more.

[Tawas]

same prob with mine after two weeks of having it ..not alone ;D

[cdoublejj]

Feb 5, 2013 17:21:44 GMT -6 deepcrk06 said:

was out riding scoot, 50cc 139qmb, having a great day, then it dies.

pulled to side of road, scoot fired right up idle great, gave it some gas and it died again.

hit starter and fires right up again, good idle

give it gas and it dies again

call home and get wife to bring truck to get me home.

at home, i check for gas, full tank
replaced fuel filter
start scooter and fires right up and idle great
give it gas and it dies.....

replaced spark plug, same prob
replaced carb with new one, same prob
checked valves, .003 on both, all good, same prob

scratch my head and go get coffee....

decide to check electrical ....

replaced cdi, bike fires up and runs great, take for ride no problems

put old cdi back on, fires up and give it gas and it dies

threw old cdi away and put on new one and all is Good

anyone else ever have a cdi act like this?

I was sure it was a fuel problem.

happy it running and so is wife... lol

Kind of but, while i was working it, it was the cheap CDI connector on the bike's harness it was merely a loose pin.