140cc wiring help needed please.

Paulhenry · 02-01-2017, 10:35 PM

Hi guys. Great forum from what I have read so far.
I'm having trouble wiring up a 140cc engine that I got second hand. The only thing stamped into it is 140cc and also the word Gongyu. The only thing that I could find out about it is that it's a yx engine.

My problem is that I can't find the right wiring diagram that has the same wires as my engine.

I have a green wire, a blue/white wire, a green/red wire, a red/black wire and a red/ white wire. The red/ white wire and the black/red wire were connected to a plastic plug but my bike has nothing to connect it to.

I joined the green from the engine to the green on my cdi, also the blue/ white to blue white and the black/red to black/red. That leaves me the green/ red and the red/white not connected to anything.

I read somewhere that someone hooked the red/ white wire into the blue/ white wire and they were able to get a very weak spark which I was also able to do. I still can't get it to kick over though. Any suggestions would be greatly appreciated. Thanks in advance, Paul.

BlackBike · 02-01-2017, 10:56 PM

Paul, I'm no help but any second someone will request that you post some pictures of this trainwreck. So I'll be the first.

humanbeing · 02-01-2017, 11:56 PM

Gongyu is 1 of the barrel maker http://www.cngongyu.com/products/50x...list_25_7.html
===
Why not use a multimeter to clear out which is which? CDi's power source / Trigger... http://www.dansmc.com/mc_repaircourse.htm had good tips...

Paulhenry · 02-02-2017, 12:33 AM

Thanks for the replies guys. All very handy.

Sorry BlackBike. I totally ment to but forgot as I was posting from my phone. Will do at the end of this post.

Jeffery, I've had a quick look at the site, but didn't find anything that matched my wiring. I'll have to have a better look.

Thanks humanbeing. I think this will help me out heaps. I just have to work out what I have in the wrong place.

Thanks again for the suggestions. I'll keep you all posted .

zingshoen · 02-02-2017, 09:31 AM

just going by colours is probably a bit risky, better check where they connect to and what they are supposed to do...previous owner could have rigged it up wrongly...or chinese factory...maybe you can find a diagram here
http://www.hooperimports.com/showpages.asp?pid=1013

- maybe read the bit at the bottom about the inconsistent colour codes!
- write your setup down for future reference.
- make sure you have good ground wires going to the frame!

zingshoen · 02-02-2017, 09:34 AM

- also: can you solder? once the setup is good, I would solder and shrinktube all connections which look like what your holding in your hand.

Paulhenry · 02-02-2017, 07:14 PM

I couldn't find anything to help me on the site, zingshoen.
Following the wires makes perfect sense though.
I certainly will be heat shrinking and soldering all connections once ( if I ever do) get it sorted out.

Paulhenry · 02-04-2017, 04:16 PM

Hi guys. Just a quick question? Would the cdi off a 125cc, work fine on a 140cc? When I purchased the 140cc second hand, it came with another 140cc, three 125cc engines and a heap of other parts. Included was a 6pin cdi and a 8 pin cdi. The wiring on the engine looks set up for the 6 pin ( or 5 pin if that's what they are called ). Thanks in advance, Paul.

02-01-2017, 10:35 PM	#1
Paulhenry Join Date: Feb 2017 Location: Newcastle Australia Posts: 7	140cc wiring help needed please. Hi guys. Great forum from what I have read so far. I'm having trouble wiring up a 140cc engine that I got second hand. The only thing stamped into it is 140cc and also the word Gongyu. The only thing that I could find out about it is that it's a yx engine. My problem is that I can't find the right wiring diagram that has the same wires as my engine. I have a green wire, a blue/white wire, a green/red wire, a red/black wire and a red/ white wire. The red/ white wire and the black/red wire were connected to a plastic plug but my bike has nothing to connect it to. I joined the green from the engine to the green on my cdi, also the blue/ white to blue white and the black/red to black/red. That leaves me the green/ red and the red/white not connected to anything. I read somewhere that someone hooked the red/ white wire into the blue/ white wire and they were able to get a very weak spark which I was also able to do. I still can't get it to kick over though. Any suggestions would be greatly appreciated. Thanks in advance, Paul.
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02-01-2017, 10:56 PM	#2
BlackBike Join Date: Feb 2016 Location: George West, Texas Posts: 4,097	Paul, I'm no help but any second someone will request that you post some pictures of this trainwreck. So I'll be the first. __________________ ***************************************** 2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE 2017 Suzuki V Strom 650 XT "We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~
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02-01-2017, 11:56 PM	#3
humanbeing Join Date: Mar 2008 Posts: 2,436	Gongyu is 1 of the barrel maker http://www.cngongyu.com/products/50x...list_25_7.html === Why not use a multimeter to clear out which is which? CDi's power source / Trigger... http://www.dansmc.com/mc_repaircourse.htm had good tips... __________________
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02-02-2017, 09:31 AM	#5
zingshoen Join Date: Jun 2009 Location: Brisbane, Queensland, Australia Posts: 648	just going by colours is probably a bit risky, better check where they connect to and what they are supposed to do...previous owner could have rigged it up wrongly...or chinese factory...maybe you can find a diagram here http://www.hooperimports.com/showpages.asp?pid=1013 - maybe read the bit at the bottom about the inconsistent colour codes! - write your setup down for future reference. - make sure you have good ground wires going to the frame! __________________ 1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM
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02-02-2017, 09:34 AM	#6
zingshoen Join Date: Jun 2009 Location: Brisbane, Queensland, Australia Posts: 648	- also: can you solder? once the setup is good, I would solder and shrinktube all connections which look like what your holding in your hand. __________________ 1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM
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02-02-2017, 07:14 PM	#7
Paulhenry Join Date: Feb 2017 Location: Newcastle Australia Posts: 7	I couldn't find anything to help me on the site, zingshoen. Following the wires makes perfect sense though. I certainly will be heat shrinking and soldering all connections once ( if I ever do) get it sorted out.
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02-04-2017, 04:16 PM	#8
Paulhenry Join Date: Feb 2017 Location: Newcastle Australia Posts: 7	Hi guys. Just a quick question? Would the cdi off a 125cc, work fine on a 140cc? When I purchased the 140cc second hand, it came with another 140cc, three 125cc engines and a heap of other parts. Included was a 6pin cdi and a 8 pin cdi. The wiring on the engine looks set up for the 6 pin ( or 5 pin if that's what they are called ). Thanks in advance, Paul.
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