SunL 150 no spark By sugarscoot (Read 3,532 times)

[sugarscoot]

Hi everyone! Working on a Sunl 150. The owner states it dropped dead on him while riding. Got it home, replaced the spark plug, the coil, and the cdi before bringing it to us to try to figure out. Replaced the stator with a new one we had on hand, still no fire! We have power at the key, power at the coil, the bike turns over, but no power at the start button and no fire to the plug. Please help! Ask what questions you need and I'll do my best to answer as the go between. Thank you in advance!

[alleyoop]

Have you checked for the KILLSWITCH grounding out the CDI? Also some scoots have a killswitch on the SIDESTAND.
Best way to ELIMINATE that possibilty is disconnect the KILLWIRE from the CDI.

Also Jump the SOLENOID touch both TERMINALS with a Screwdriver or Pliers or piece of wire It should SPIN the STARTER.
Also with the KEY on and you squeeze the BRAKES do the STOPLIGHTS COME ON? The Brakes split it sends voltage to the STOP LIGHTS and to the SOLENOID. You can also test to see if the SOLENOID is getting juice when you squeeze them Tape the BRAKES ON and test the YELLOW AND GREEN wire going into the SOLENOID it should have VOLTAGE. The Start button all that does is GROUNDS the SOLENOID to complete the Circuit.

And try squeezing both brakes if one does not appear to be working because it also could be bad brake switchs.

Also make sure there is a GROUND WIRE from the FRAME TO THE MOTOR usually a ground wire is attached to one of the VALVE COVER bolts.

The only other thing would be the PICK UP COIL if that was not changed when you put in a NEW STATOR.
Alleyoop

[sugarscoot]

Would the little magnetic box in the lower left be the pick up coil?

[sugarscoot]

If so, it's connected to the stator, so yes it was replaced. Brake lights do come on. Checking for ground wire now.

[alleyoop]

Yes that black little box is your PICK UP COIL.
Alleyoop

[sugarscoot]

Okay, still nothing new to report, hubby got pulled off onto an intake job on a car yesterday. Back at it this morning, will update with a more complete report once I can get him to sit still for five minutes and explain to me what he's tested, what he's found, and what he plans to do next. Thanks for the help Alleyoop

[sugarscoot]

Okay, had a quick chat with Dwayne. He's replaced every part of the charging/starting/firing system except the wires. ; Now he's checking them for continuity. Just goes to show, sometimes when you hear hoof beats, it's horses, not zebras! I'll let you know what he finds.

[sugarscoot]

Well, the wires ohm out normal. So back to the start. Bike cranking, stator wires, black/red wire has 9.0-10.0 v while the blue/white has .17 with peaks up to .33. Coil ohms to: Primary .4 and secondary 2.84. Ideas?

[alleyoop]

Well I am out of ideas guys I am not the ELECTRICAL GURU I can get around it pretty good but not an expert on it by no means. I am a CARB, MOTOR and CVT and TRANNY guy, so I will email JR he is the Electrical GURU and can wire up a scoot blindfolded. He knows the actual colors of the WIRES if you can believe that(HAHA).

He will chime in and get you guys going I am sure.
Alleyoop

[JR]

Oct 11, 2013 8:50:54 GMT -6 sugarscoot said:

Well, the wires ohm out normal. So back to the start. Bike cranking, stator wires, black/red wire has 9.0-10.0 v while the blue/white has .17 with peaks up to .33. Coil ohms to: Primary .4 and secondary 2.84. Ideas?

9.0 - 10.0 v is this AC voltage or did you have the meter set to DC. You should set your volt meter to the 100 to 200v AC range. If this is AC then it's not going to fire. Even just cranking it over it should have a minimum of 50Vac and up to 100Vac. If the pickup coil reading is AC voltage then it's good.

Yes they sell bad stators sometimes. If your readings were DC voltage then take them again on the AC setting and report back.

JR

[sugarscoot]

They were ac JR. :'(Looks like a bad stator. We have another scoot, same style, here for a different problem. We'll pull the stator off of it and see if it cranks up the sunl.

[sugarscoot]

Speaking of the other bike, same 150 style, it's running fine from start to about 3,000 rpm. Then it bogs down (Dwayne's words). Would that be in the valves? He cleaned the fuel system, but the carb can't be soaked due to plastic parts. Could it be something in the cab, ie stopped up? To me, acts more like the valves, kind of like mine did when they got tight.

[sugarscoot]

It was a bad stator! Took the one off the other bike and put it on the sunl, fired right up! Now to try to get a replacement for the other one.

[JR]

Oct 14, 2013 8:39:14 GMT -6 sugarscoot said:

Speaking of the other bike, same 150 style, it's running fine from start to about 3,000 rpm. Then it bogs down (Dwayne's words). Would that be in the valves? He cleaned the fuel system, but the carb can't be soaked due to plastic parts. Could it be something in the cab, ie stopped up? To me, acts more like the valves, kind of like mine did when they got tight.

Could be either or both, a stopped up main jet will bog along with no valve gap.

JR

[alleyoop]

Check your Diaphgram on the ODER 150, Around 3K it is supposed to start rising and pulling the NEEDLE out of the main jet and defuser to feed it more fuel. It appears either the MAIN JET is clogged which is rare because the hole is pretty big or the Diapghram has a rip and loosing pressure and will not left the cylinder/needle up.
Alleyoop