santa clause is coming to town and he needs help

miatawnt2b · 12-22-2020, 07:44 PM

The wife and I decided to shake down the 3 new 125's this afternoon. One of them just quit as she was going up a hill. Refuses to restart.

I haven't completely torn into it, but I've swapped a carb, spark plug and coil so far. All the parts from the dead ATV work fine on the good one.

On the dead ATV, I have spark and fuel flow, i've verified spark stops when you pull the emergency disconnect button. So I think the electrics are working, I'm wondering if it could have gotten out of time somehow.

Please, any help would be appreciated. I'm in a bind.

-J

**JerryHawk250** · 12-23-2020, 07:40 AM

More than likely it's a bad CDI. Try swapping one with the other to rule that out.

TxTaoRider · 12-23-2020, 09:33 AM

Or try swapping the suspect cdi box on to a running atv.

miatawnt2b · 12-23-2020, 09:54 AM

yep. swapped the regulator and the CDI from the dead quad into a working one. Fired right up. Put the ones from the ones from the good quad into the dead quad and still won't start. The only thing I haven't swapped is the engine at this point right?

**JerryHawk250** · 12-23-2020, 10:08 AM

You might need to adjust the valves on the one not running. It's possible that the valves are set so tight that the valves are not fully seated which equals no compression. This is common on just about all the china bikes and atv's.

miatawnt2b · 12-23-2020, 11:06 AM

yea, tried that also just now. They were indeed tight. same behavior though. Strange though that it was running perfect then just died without any notice. I'm leaning magneto (even though i have spark, who knows if its in time), but I really don't want to tear into it that deep without talking to the dealer first.

This is a real bummer.
-J

miatawnt2b · 12-23-2020, 11:13 AM

is it possible to pull the magneto cover without taking the engine completely out on a 125?

**JerryHawk250** · 12-23-2020, 11:15 AM

Did you check compression?
Also Someone else on here had an issue with the pick up sensor being set to far away. It still had spark but was weak. May be something to look into.

miatawnt2b · 12-23-2020, 11:34 AM

One thing I don't have is a compression gauge. I can feel pretty good puffs of air out the pipe.

China Rider 27 · 12-23-2020, 11:49 AM

Coil partial grounding on paint

miatawnt2b · 12-23-2020, 12:19 PM

Quote:

Originally Posted by China Rider 27

Coil partial grounding on paint

coil is all plastic and just hanging there at the moment. not touching anything.

China Rider 27 · 12-23-2020, 02:54 PM

Quote:

Originally Posted by miatawnt2b

coil is all plastic and just hanging there at the moment. not touching anything.

Sounds like it does not ground by contact with the frame. Alot of the bikes, the coil is metal and grounds against the frame by mounting bolts, paint underlying can make for bad ground which will cause the weak spark.

miatawnt2b · 12-23-2020, 03:06 PM

Thanks for all your help guys. I really appreciate it. No luck yet, but hopefully I'll get it.
-J

miatawnt2b · 12-23-2020, 03:37 PM

swapped out the stator and pickup assembly from a good quad and still nothing.

TxTaoRider · 12-23-2020, 03:42 PM

Is the spark plug wet?

12-22-2020, 07:44 PM	#1
miatawnt2b Join Date: Dec 2020 Posts: 78	santa clause is coming to town and he needs help The wife and I decided to shake down the 3 new 125's this afternoon. One of them just quit as she was going up a hill. Refuses to restart. I haven't completely torn into it, but I've swapped a carb, spark plug and coil so far. All the parts from the dead ATV work fine on the good one. On the dead ATV, I have spark and fuel flow, i've verified spark stops when you pull the emergency disconnect button. So I think the electrics are working, I'm wondering if it could have gotten out of time somehow. Please, any help would be appreciated. I'm in a bind. -J
	0

12-23-2020, 07:40 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,555	More than likely it's a bad CDI. Try swapping one with the other to rule that out. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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12-23-2020, 09:33 AM	#3
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Or try swapping the suspect cdi box on to a running atv. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
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12-23-2020, 10:08 AM	#5
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,555	You might need to adjust the valves on the one not running. It's possible that the valves are set so tight that the valves are not fully seated which equals no compression. This is common on just about all the china bikes and atv's. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	0

12-23-2020, 11:15 AM	#8
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,555	Did you check compression? Also Someone else on here had an issue with the pick up sensor being set to far away. It still had spark but was weak. May be something to look into. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	0

12-23-2020, 09:54 AM	#4
miatawnt2b Join Date: Dec 2020 Posts: 78	yep. swapped the regulator and the CDI from the dead quad into a working one. Fired right up. Put the ones from the ones from the good quad into the dead quad and still won't start. The only thing I haven't swapped is the engine at this point right?
	1

12-23-2020, 11:06 AM	#6
miatawnt2b Join Date: Dec 2020 Posts: 78	yea, tried that also just now. They were indeed tight. same behavior though. Strange though that it was running perfect then just died without any notice. I'm leaning magneto (even though i have spark, who knows if its in time), but I really don't want to tear into it that deep without talking to the dealer first. This is a real bummer. -J
	0

12-23-2020, 11:13 AM	#7
miatawnt2b Join Date: Dec 2020 Posts: 78	is it possible to pull the magneto cover without taking the engine completely out on a 125?
	0

12-23-2020, 11:34 AM	#9
miatawnt2b Join Date: Dec 2020 Posts: 78	One thing I don't have is a compression gauge. I can feel pretty good puffs of air out the pipe.
	1

12-23-2020, 11:49 AM	#10
China Rider 27 Join Date: Dec 2018 Location: PNW Posts: 982	Coil partial grounding on paint
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12-23-2020, 03:06 PM	#13
miatawnt2b Join Date: Dec 2020 Posts: 78	Thanks for all your help guys. I really appreciate it. No luck yet, but hopefully I'll get it. -J
	1

12-23-2020, 03:37 PM	#14
miatawnt2b Join Date: Dec 2020 Posts: 78	swapped out the stator and pickup assembly from a good quad and still nothing.
	0

12-23-2020, 03:42 PM	#15
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Is the spark plug wet? __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
	0