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 Post subject: GY6 voltage issue with carb choke
PostPosted: Sat Nov 21, 2015 7:03 pm 
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Hey all,
So I'm having this issue where my GY66 buggy will start OK and run fine cold. But after it warms up and under any load, it will hesitate and take a lot of feathering of the throttle to get up to speed. Then it will begin to stall. It's really hard to start after it is warm. I then have to put the battery on a charger and wait another day.

Thinking it's the carb, I've traced the wiring quite a bit. The wire going to the carb choke is gray and white. The gray wire goes to the resistor, and has a black wire on the other end; assume it goes to ground.

So the white wire should have 12V DC, right?. I've traced this wire to a wire in the 4-wire plug of the rectifier. I've read a lot about this, but haven't found symptoms that match mine. What I have found is that when not running, the white wire has no voltage (good). When running, that white wire doesn't seem to be 12V. When measured with a DMM in VDC, it actually measures negative!!? What the? That confused me. When I flip the DMM to VAC, it shows a few volts at idle and increases with throttle. But I don't think it should be doing this...right?

Attached is a pic of my 4-wire plug going into the rectifer. Next to the red is white. Next to the yellow is black.

Any ideas I can try to do to figure this out?

Thanks,


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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Sat Nov 21, 2015 10:21 pm 
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Most likely the pilot jet is clogged in the carburetor. Once the choke warms up and shuts off the enricher circuit, you are not getting fuel at idle or the first half of the throttle range.

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Sun Nov 22, 2015 10:06 am 
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Thanks for the reply. I forgot to mention, I also purchased a brand-new carburetor, thinking the same. However, same issue as before with the old carb!

That's why I'm onto the choke electrical power. And I also have other electrical issues that may be related...

Thanks,


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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Sun Nov 22, 2015 8:26 pm 
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Ok, so how about this question: what powers the auto-choke on the GY6 carburetor? From what I've read, it need 12VDC.

If I have 4-wire rectifier, where does the power to.the choke come from? Obviously you don't want a constant 12V source, or the choke would always be in the warm state (needle closed in this case.)

SO where is the switched 12VDC only when running on these engines?


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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Sun Nov 22, 2015 9:30 pm 
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The choke is powered by AC directly off one of the stator windings. AC is applied any time the engine is running.

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Mon Nov 23, 2015 12:03 am 
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PGH wrote:
The choke is powered by AC directly off one of the stator windings. AC is applied any time the engine is running.


AC?! Wow, Ok then, that explains the 'white' wire to the choke, being the same white wire at the rectifier 4-pin plug. I will have to measure the AC voltage between the wires on the choke 2-pin plug and see what I have. Maybe the choke is not the problem then...!?


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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Mon Nov 23, 2015 10:37 am 
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http://www.buggydepot.com/tech-center/1 ... -it-works/

https://www.google.com/?gws_rd=ssl#q=Gy6+150+choke+test

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Mon Nov 23, 2015 7:18 pm 
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Thanks for the links. I had actually read the 1st one previously and watched a video from your 2nd link. In both cases they mention 12 volts yo test, but neither mention AC.

Now connect the choke’s electrical leads to a 12v power source. Black is negative."

So possibly it can work with either AC or DC...?


Now I'm thinking it may be valve clearances...


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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Mon Nov 23, 2015 7:41 pm 
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The choke works on AC or DC voltage. It's just a heating element that makes a plunger extend when warm. The plunger cuts off the fuel enrichment circuit (pathway) in the carburetor when extended.

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Tue Nov 24, 2015 9:52 am 
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On my 150 I have never had an actual choke problem (doesn't mean it wont) but I have had the resister fail... so you need to take readings from choke (enrichment) side

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Tue Nov 24, 2015 9:58 pm 
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I ran it tonight and measured the voltage between the two terminals that connect to the choke. It was about 4.8VAC at idle. Does that sound ok? Definitely not the 12V mentioned...I assume the voltage would increase with increased rpms?

I also adjusted the valves...they definitely needed adjusted. But it still took awhile to start. Idled good, but then died a couple times, and I had to restart. Didn't take it for a spin, but giving it some gas with the parking brake on, it hesitated a couple of times. So...not much change unfortunately.


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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Thu Nov 26, 2015 10:47 am 
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You need to pull the choke to see if the needle extends with power supplied to it

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Thu Nov 26, 2015 12:54 pm 
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to me your problem sounds like you have a intake leak just a tiny pin hole will cause it to lean pulling air in beside the air filter.cause hard starts won't idle hesitate or bogs down when trying to throttle up.
i went through 4 of those rubber intakes the rubber lets loose that is molded around aluminum part of intake.the rubber is paper thin around the stud holes in intake.my leak was always passenger side.


the chokes are a pain in the rear on my wiring power wire for choke is wired off the rectifier maybe 8'' using either the white or yellow wire can't remember now head lights also no power until engine running ac
12volt wired you should beable to have key switch in run postion and choke will have power to it.

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Sun Nov 29, 2015 10:29 am 
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So...I fixed it! I was stumped, the chances that it was a brand-new carb (and new manifold too, pud) were slim. After going through the no-spark troubleshooting guide at buggydepot, and using a spark tester, I had good spark. Wtf!? So then I thought, let's check the sparkplug gap. It's the last thing in the line.

Sure enough, it was super tight. Couldn't even get my tool to slide in at the minimum size. I opened it up to spec screwed it in, hit the key and she fired right up! No missing at high speed or anything.

Go figure. Thanks for all your help and comments, to help me get to the bottom of this issue.

Now I gotta replace the starter...it keeps seizing up on me..The hammer trick is only going to work for so long.


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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Tue Aug 30, 2016 6:36 pm 
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PGH wrote:
The choke works on AC or DC voltage. It's just a heating element that makes a plunger extend when warm. The plunger cuts off the fuel enrichment circuit (pathway) in the carburetor when extended.


Interesting as mine has been disconnected for years. Always ran a little rich. Can I just wire it in to give power when the key is on? Or does it have to come from a stator wire?

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 Post subject: Re: GY6 voltage issue with carb choke
PostPosted: Sat May 13, 2017 3:03 pm 
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MPDano wrote:
PGH wrote:
The choke works on AC or DC voltage. It's just a heating element that makes a plunger extend when warm. The plunger cuts off the fuel enrichment circuit (pathway) in the carburetor when extended.


Interesting as mine has been disconnected for years. Always ran a little rich. Can I just wire it in to give power when the key is on? Or does it have to come from a stator wire?


Funny, no one answered me. I ended up wiring it up to 12v from a key on source and it worked great. Just in case this gets searched at a later date.

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