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.

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.:)

Gongyu is 1 of the barrel maker http://www.cngongyu.com/products/50x...list_25_7.html
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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...
http://i962.photobucket.com/albums/a...28613DDA3B.jpg

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 .

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!

- 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.

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.

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.