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Post by greens on Aug 13, 2013 22:05:51 GMT -5
Some of the back story is posted in the wrong forum. I think a chinese 50cc 2 stroke would go here. Service Manual is pretty good. files.hyosungmotorsusa.com/SF50_service_manual.pdfSo i have been having some very odd electrical problems with a very low mile scoot. If the Regulator/rectifier is plugged in, the headlight will remain on after the scooter is off. it will cause the fuse to get very hot, and if the starter is engaged, the fuse breaks. With the Regulator/Rectifier unplugged, the scooter turns over but will not start. It smells of gasoline. It should be known that the scooter was originally able to start with the rectifier/regulator unplugged. Everything seemed to be working fine. only recently did it start, stall moments later, and not start again. I think it's safe to say the rectifier regulator is toast and can be replaced, plugging it in causes a short. Something else has probably now taken too much abuse from not having the R/R and will also need to be replaced? But before i can reliably test that i need the R/R. I see some online now, and will call the local dealers in the morning. I don't really know what i'm doing, maybe i should just see what they want to look at it. |
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Post by skuttadawg on Aug 13, 2013 23:11:39 GMT -5
I would replace the voltage regulator ASAP . I have not heard of starting up a scoot with it unplugged as it may fry your electrical system . A hot or blown fuse can be from to many amps or voltage . Are the lights bright when it runs ? Buy it new or used ? Had higher wattage headlight(s) installed ? Has it blown any bulbs ? Electrical parts burn out just as mechanical parts wear out . Do headlights some on with start of engine or turn of the key ?
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Post by greens on Aug 13, 2013 23:32:01 GMT -5
thing has 300km on it.
stock everything.
The only thing i could see from the R/R being unplugged was that it no longer charged the battery. But after looking at the schematic i can clearly see it is responsible for a great deal.
With the R/R plugged in the lights are on if the battery is connected. totally off with the key in my pocket, doesn't matter. I imagine if you stuck a light bulb on one of the bolts it would light up too, the whole bike is charged haha.
with the RR unplugged the light comes on when it is supposed to, with the key and switch on.
The R/R, or something attached to it, is causing a short, its grounding the positive somewhere, but since it has like 100 miles on it, the wires look great. One of the guys on the 4 stroke forum mentioned diodes, but i don't see anything like that on the bike or in the manual.
After replacing the R/R, i'd have to track down what was preventing the spark. That could be only a few things, the ignition coil, cdi, or the stator itself. I would have no idea how to test them. I have a meter, but the results i'm supposed to get according to the manual are well.. wrong.
it has been sitting for 6 or 7 years....
I guess there isn't really anything i can or should do until i replace the R/R
Would any R/R work?
On that note, will any 4+2 round 2 stroke 50cc CDI work?
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Post by skuttadawg on Aug 13, 2013 23:43:28 GMT -5
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Post by greens on Aug 14, 2013 1:40:50 GMT -5
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Post by teddy554 on Aug 14, 2013 9:16:15 GMT -5
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Post by devo344a on Aug 14, 2013 9:25:57 GMT -5
If you have the regulator unplugged the choke or enrichener for the carb wont work it gets its power from the regulator
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Post by greens on Aug 14, 2013 11:22:38 GMT -5
That article def helps, and lets me know that looks can be deceiving.
I found an exact OEM replacement… for 45 bucks. They also want 80 for a CDI… YIKES
The scoot worked for like 2 weeks like a champ without the R/R, foolish I know, but I thought all it did was turn AC to DC to charge the battery.
Then one day, started, rev’d, stalled, never to turn on again.
So right now I have to decide, 45 for the exact R/R or 20 for something that may or may not work….
I am going to dive deeper and see how that guy was able to test his R/R. I also am concerned that if I get a different R/R, I will have trouble diagnosing the fail to start, because I won’t really know if it is the R/R or something else. Then again, the new R/R not causing a shock should be a good indicator haha!
I have still yet to call local dealer, and Hyosung themselves… boss lurking over shoulder… I see the SF-50 is still in their catalog for 2013, so someone has parts somewhere! Which is a huge relief for me, really.
Even if I have to replace every component at dealership prices… its still cheaper than registering that car I have in the driveway!!
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Post by nassauequipment on Aug 14, 2013 19:57:13 GMT -5
Have you found the schematic on the scooter?
Normally the charge circuit has nothing to do with the cdi.
BUT, it could supply the power to the choke/enrichiner.
pm the wiring schematic and I'll try to help.
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Post by wilds on Aug 15, 2013 0:05:52 GMT -5
This one might be useful  |
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Post by greens on Aug 16, 2013 11:21:30 GMT -5
That schematic actually looks pretty accurate in places, but also seems a bit complex, I have no burglary system afaik, and some of what is referred to as “switches” aren’t present, unless they are like internal relays of some kind.
So I am going to purchase the exact match R/R today. Hopefully that will solve my problem. My concern is that after I get the R/R, it may fix my short, but not the fail to start. I can see the R/R here does go to a few places…
The weirdest thing is that I was using it without the R/R with great success, replacing the R/R is of course a good thing, but I can’t see how it worked before and now doesn’t. Maybe it’s flooded and since the choke won’t work it can’t get clear? Maybe it is because it is choked out and can’t enrich?
BAH, I will just wait until I get the R/R, then I can start testing for spark, seems like the best thing to do.
If I plug in the new R/R and it still grounds out then I have this diagram and can look elsewhere, although trial and error seems expensive.
I have to admit I got a little discouraged, having difficulty testing my R/R, among other things, like the ignition coil etc. I would feel silly if it was the very cheap ignition coil but I bought the much more expensive R/R.
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Post by greens on Aug 20, 2013 16:06:51 GMT -5
Awh man, just got an email saying the R/R is actually taking the slow boat from china and could be a while...
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Post by greens on Aug 29, 2013 9:49:15 GMT -5
R/R arrived today!
I ended up getting a cheaper one that looked right, and i believe it is a match.
My dead short is gone and all electrical seems to be working properly.
I haven't had a chance to test if it is charging because... It still won't start.
Starter is engaging and turning it over, but no dice.
So now i need to test for Fuel, Spark, and Air...
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