Hyosung SF50R, no spark, bad stator? By FACE PLANT FOR LIFE (Read 6,041 times)

[FACE PLANT FOR LIFE]

We think the reason this thing has a bad stator is because I tested the AC coming from the yellow wiring and I'm getting 5.6 volts with the starting motor engaged. Is this too small for spark? The previous owner cut wires from the CDI so we had to rig it up because the .110 connector are close to impossible to get. Is this the correct stator for it?
www.hyosungsource.com/index.php?main_page=product_info&cPath=90&products_id=1229&zenid=dseft7dr535mlfb2sbfv4k3af0

[Alleyoop]

Best thing to do is take yours off and match it as well as the wires. There are so many of those they may have changed them from year to year.
Alleyoop

[FACE PLANT FOR LIFE]

Okay. I also just did a compression test on it. 120 PSI, not enough to run. This bike has more issues than I thought.

[jct842]

Most will run with 120 lbs but usually show symptoms. My majesty was still running with 85-90. But not well and blowing oil out the vent.

[jct842]

oops

[FACE PLANT FOR LIFE]

Okay, so maybe it does have enough compression to run, but that still leaves us with intermittent spark. The spark just works when it wants to...you can sit there and crank the engine with the plug grounded to the engine all day but you'll be lucky if it sparks once or twice.

Okay, so it sparks...just rarely.

[Bashan]

Did you blow oil out your vent again John? We talked about this.....

A of N....do you have a wiring diagram? Hyo's are odd ducks and I'd be guessing, but usually the yellow is AC to the headlight etc. It wouldn't have anything to do with the spark....on a regular GY6. The CDI power feed or the trigger could have something to do with it, but I'd have to look at a diagram. Maybe Jack has one....I'll ask him. Rich

[Bashan]

Well Jack came through for us, here is your stator config:

As I suspected, it is a conventional system with different colored wires. This is a good illustration of the center tap. You can see the coil on the right (W/R) is analogous to the white wire on a GY6 stator. The other coil (Y/W) center taps into this coil and it is this one that is analogous to the yellow AC supply on a GY6. Those two wires do not have anything to do with spark. However, the white and brown are the trigger coil and the B/R is the AC power to the CDI. All three of those could be affecting the spark. Rich

[FACE PLANT FOR LIFE]

Unfortunately, none of those wires match any wires on the CDI?

[Alleyoop]

Well how about some help, take a picture of your CDI with the wires plugged in.
Alleyoop

[FACE PLANT FOR LIFE]

[Alleyoop]

WOW!! that is the opposite of the CDIs that everyone sells. The two plug is on the left and the 4 plug is on the right. See what I mean PICTURES are worth a thousand words. That is the first one I have ever seen like that.
Alleyoop

[Bashan]

IF the colors are consistant with the GY6s, the white/blue is the trigger, the black/yellow the coil feed, and the black/red is AC CDI feed. The others? I'd be guessing because as Alley said, the plugs are totally unconventional. You would have to get the multi out and start some testing. I can tell you what to do if you wish to pursue it. Rich

[Alleyoop]

files.hyosungmotorsusa.com/SF50_service_manual.pdf

[Bashan]

Hey Plant....is that a 2T? It looks like it in the link Alley provided. Rich