GY6 No Spark.

[Rustynuts]

Hey guys been using your website for the last few days to troubleshoot some problems we have been having with our quads. Now i know this is a scooter website but we have GY6 engines in the quads so apart from the extra wheels theres no other difference And you guys seem more clued up on whats going on with these engines than any of the other sites iv visited.

I have a fully working machine and my buddy has a none running machine (Bought as spares or repairs). Iv been taking parts off my quad and putting them onto his to try and eleminate the problems.

Originally his carb was all clogged up so i stripped it and cleaned it, refitted it and it ran but ran horrible. Fitted a new plug as it looked old and tired, it ran nice on tick over but stalled when any amount of throttle was added. So i fitted my carb to his quad and it ran beautiful.

So i stripped his carb again and gave it another clean, then read that the Enricher can sometimes foul so i put mine on his carb and refitted everything, this is when we started getting a hit and miss spark.

Whats weird is that there will be no spark when its turning over but as soon as i let go of the starter button i see a little spark.

Iv tried my coil pack on this quad but there still no solid spark.

My CDI has a different type of plug on to his so i cant swap them over to test it out. Im waiting for another friend to call round with his multi meter so we can test its getting a signal but in the mean times iv been trying to source a new CDI on the off chance it is indeed dead.

The one he has has a green single 4 pin plug on. But all the others iv seen on places like ebay have 2 white plugs (a 4 pin and a 2 pin) Will these still work if not where do i get one from.

Thanks

[edfr]

Sounds to me it is the ENRICHER that is the problem. Check the wires on the ENRICHER they may be grounding out, the enricher gets it juice from the Stator once the motor starts. So check the wires on the ENRICHER make sure they is no breaks in the wireing or bad plug from the stator that it the Enricher plugs into.
Lefty

[Rustynuts]

Thanks for the quick reply.

If the enricher is not working does this effect the spark?

Ill warn you in advance im good with tool but not with the technical stuff so please be patient with me hahaahahah

[Rustynuts]

Btw its late here now and the surrounding houses have small children so im not going to be able to do any testing tonight.

Ill take out my enricher first thing in the morning and replace with his and try again.

Is there anything else i can test/check before i get him to order parts.

Thanks in advance.

[edfr]

From what you said and tried it sure points to a wireing problem with the ENRICHER. I had another guy with a problem like that, but all he had to do is shake the scoot and it would miss, or move the carb a little. It was a bare wire on the enricher making contact with the motor and casueing the problem.

What you can do if this happens at IDLE take the ENRICHER OFF and unplug it. Then put your thumb over the hole and hold it there(that acts just like the enricher would when cold it will feed the extra fuel for cold starting). If it runs good then you know BAD enricher.
Lefty

[tvnacman]

Welcome to the fourm rusty , if you can post ,text or email me a pic of the cdi I can help .
I have seen the ignition switch go bad on the atv's. My phone number is in my banner

John

[Rustynuts]

Thanks for the info edfr ill have a good look in the morning and let you know how i get on with it, i might have indeed trapped something as some stage and not noticed.

tvnacman thanks for the offer but im from the UK and rining you about this part would cost me a fortune

Heres a pic iv just taken for you, even if you can give me a name or part number of it or something that would work that would be great.



It has JM0307 stamped on the side of it if that helps.

Thanks guys.

[woowilly]

I had a similar problem when I bought a non running scooter.
No spark and occasionally a few weak sparks while cranking and
sometimes a good strong spark or two when I released the starter button.
turned out the engine to frame grounding wire had broke at the terminal.
One end of this wire is bolted to the frame the other end goes to one of the valve cover bolts to ground the engine.
Repairing the engine to frame ground wire gave me a good spark and running scooter.
The coil and CDI ground wires connect to the frame on mine.
( The spark plug grounds to the engine's cylinder head where it's screwed in..)
( the wire used for the engine to frame ground on mine isn't the best choice for the application, many fine strands would be better than a few big strands for a wire that gets flexed a lot by engine motion. )

If you suspect the carb enrichener is causing your no spark condition, just unplug the wires to it and see if you get a good spark.
It's seems unlikely the enrichener could cause a no spark problem, The enrichener is powered by a tap on the stator winding for the headlight, which is totally seperate from the winding that powers the CDI.
( Above assumes typical china scooter with AC CDI.)

[Rustynuts]

Thanks alot for the reply.

Thats anothe thing ill check in the morning.

Really Appreciate all the help.

[edfr]

TVANCMAN can get you 4 Pin Cdi if that is what you are looking for:
Lefty

[tvnacman]

www.testedscooterparts.com/advanced_search_result.php?keywords=10580013&searchop=or&x=10&y=9

here you go Rusty !!
ty lefty

John

[edfr]

Sorry John, I keep on forgetting you have a Full Website now. Will not happen again.
Lefty

[tvnacman]

Feb 17, 2013 16:11:51 GMT -5 edfr said:

Sorry John, I keep on forgetting you have a Full Website now. Will not happen again.
Lefty

no problem lefty

I would like to see the wire colors in the harness on that atv .

John

[Rustynuts]

Thanks for the link Tvnacman, least i know you can buy them now. Ill get a picture of the wiring for you in the morning.

Before we do go ahead and order new parts im going to go and do what the others have suggested first.

Btw if i do need to order can you deliver to the UK? If so how much we look at?

Thanks again.

[tvnacman]

Feb 17, 2013 17:19:40 GMT -5 Rustynuts said:

Thanks for the link Tvnacman, least i know you can buy them now. Ill get a picture of the wiring for you in the morning.

Before we do go ahead and order new parts im going to go and do what the others have suggested first.

Btw if i do need to order can you deliver to the UK? If so how much we look at?

Thanks again.

Rusty , I like to test electrical parts before shipping . My supplyer has the part in stock . I do not have it in my hands being that your out of the US I would like to order the part and test it . Then ship it to you . I need your full address to quote you . You can register on my site then I will have your address or you can send it to me in a pm . your choice .

John

[woowilly]

here's the pinout for Your 4-pin CDI.
www.roketapartsonline.com/popup_image.php?pID=17778


and a couple wiring diagrams with wire colors
www.chinese-parts-canada.com/wire_diagram.html

www.hooperimports.com/images/Engine_Wiring/4_wire_Electric_Start_Wiring_Diagram_HI.jpg

[Rustynuts]

Sorry its taken me so long to reply, the weathers been terrible over here and iv not had chance to mess about with the quad.

Today i was getting a spark, get the quad running and it run fine after setting the carb back up right. Messed around with the enricher and if i wiggled the wires near the plug it started to die. Cleaned the teminals best i could and check it again and it still started to cut out if i wiggled the wires so there is defo a problem at that end.

But now iv lost the damn spark again so i cant get it started to keep testing.

Not sure if its enricher side or the wiring loom side thats the problem but ill keep trying once i get my spark back.

Thanks.

[Rustynuts]

UPDATE.

Figured out the hit and miss sparking problem we was having. Traced it down to a Black with Red stripe wire going into the CDI unit. It wasnt making a proper connection to its terminal, pushed it all the way into the plug and BOOM, spark is back

Shes a bloody pain to start though, but after a while of turning over it will kick into life.

Thanks for all the help guys.

[tvnacman]

rusty adjust your valves !!!!

John

[Rustynuts]

Yeah that the next step we are going to undertake. Just need to find someone with a set of feeler gauges. Never adjusted valves before but been watching a few how too's on youtube and it looks simple enough.

Just been back out after letting the battery charge for a few hours and its turning over with a spark but no fuel is getting through, the plug is dry.

[tvnacman]

put some fuel in a shot glass and suck it up with the vac line . if it starts connect the vac line quick .

some guys use a piece of a soda can in place of a feeler gauge , its a little thinner than .004 , I like to do booth .004 .

www.testedscooterparts.com/
John

[Rustynuts]

Yeah it starts if i squirt fuel down one of the vac lines and it will carry on running untill you stop it, but then if you go to start it again it wont. Or at least it struggles.

Wondering if one of the vac lines isnt sealed correctly.

Iv been out and bought a set of gauges, i couldnt find anyone to lend me a set, but its gotten very cold here and its late so thats tomorrows job.

Thanks for the replys.

[tvnacman]

I think your on the right track check the vac lines and also fuel delivery .

www.testedscooterparts.com/

John

[Rustynuts]

Took the valve cover off and there was no clearance on either of them, so i adjusted them too .004 and .005 and Boom she fired straight up first go, been out on local field for a quick blast and she flys.

My mate is now a very happy chappy.

Thanks alot guys for all the help and info and i hope one day i can repay the favour

[tvnacman]

don't be a stranger !!!!

Good luck

John