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post #1 of 15 (permalink) Old 4 Weeks Ago Thread Starter
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Hi. I'm new to this forum and just bought a used APC mini chopper. I'm unsure if its 43cc or 49cc. It's red with the fat red tank with chopper decal, has the 2 rear wheels. I'm having some issues with it and need some help. Thanks

Last edited by dgmenace73; 4 Weeks Ago at 06:08 PM. Reason: mini chopper purchase
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post #2 of 15 (permalink) Old 4 Weeks Ago Thread Starter
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Ignition, coil question

The APC mini chopper's ignition switch is a 4 wire....unsure if its supposed to be a 1 or 2 position switch. It has green, blk, blk/wht, and red wire. When I first bought it I could jump the red to black and the accessories (lights, horn, signals, signal beeper) would work but the spark plug had no spark. It took me a little while to realize that it had a brake safety switch but I do know that now. I then could jump the red wire to the blk/wht wire and it would have spark. We had a down pour and I covered it up quickly and the next time I went out to work on it, when I jumped the red to blk/white the jumper sparked and got hot extremely quick. I would like to know if it is supposed to have a 2-position switch to where first position is for accessories and then next position would be for run, then press yellow start button on right hand side? It has a 2-wire coil (X-G) is stamped on it. One wire is red/blk, the other is green/blk. I think the coil is shorted. I followed the blk/white wire from ignition to the coil so I checked continuity of both wires to ground and it was 0 resistance then wire to wire was 0 resistance. Am I on the right track here? Thanks in advance.
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post #3 of 15 (permalink) Old 4 Weeks Ago
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Re: Ignition, coil question

dbl post...………....

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Last edited by CAM2; 4 Weeks Ago at 07:08 PM.
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post #4 of 15 (permalink) Old 4 Weeks Ago
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Re: Ignition, coil question

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Originally Posted by dgmenace73 View Post
The APC mini chopper's ignition switch is a 4 wire....unsure if its supposed to be a 1 or 2 position switch. It has green, blk, blk/wht, and red wire. When I first bought it I could jump the red to black and the accessories (lights, horn, signals, signal beeper) would work but the spark plug had no spark. It took me a little while to realize that it had a brake safety switch but I do know that now. I then could jump the red wire to the blk/wht wire and it would have spark. We had a down pour and I covered it up quickly and the next time I went out to work on it, when I jumped the red to blk/white the jumper sparked and got hot extremely quick. I would like to know if it is supposed to have a 2-position switch to where first position is for accessories and then next position would be for run, then press yellow start button on right hand side? It has a 2-wire coil (X-G) is stamped on it. One wire is red/blk, the other is green/blk. I think the coil is shorted. I followed the blk/white wire from ignition to the coil so I checked continuity of both wires to ground and it was 0 resistance then wire to wire was 0 resistance. Am I on the right track here? Thanks in advance.
Welcome to the site....Mini Harleys come 43cc [40mm bore]only..

The switch has 4 wires as you said...2 wires [the red and the black] connects/transfers the 12v power[when keyswitch is turned "ON" also disconnect the power when turned off

The other two wires [the green and the black with white stripe]deactivates[ungrounds the coil] the killswitch when the keyswitch is turned"ON" and activates the killswitch[grounds the coil] when the keyswitch is turned "OFF"

You do realize you can simply unplug the plug coming from the fancover on the transmission side and simply pullstart the thing....

I'll be surprised if it starts seeings it sounds like you put 12v power through the coil windings from the grounded side...……...

https://www.amazon.com/GOOFIT-Igniti...793XBDTHW1ZVVS

https://www.ebay.com/itm/Ignition-Mo...0AAOSwlptaTUSv

The e-starter/generator combo aswell as the wiring is highly problematic and Im mainly a fan of the K.I.S.S methodology when it comes to this stuff[Keep It Simple Stupid]...LOL

When properly tuned they start-up in 2-3 pulls...

This is my old mini Harley...Its alil bit modified..







Good Luck with yours..

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Last edited by CAM2; 4 Weeks Ago at 07:29 PM.
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post #5 of 15 (permalink) Old 4 Weeks Ago
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Remember it's just weed whacker engine all the wiring is for the novelty accessories find the two skinny little wires that go into the engine and disconnect them and you should have spark and be able to pull start it

Once you get it to run ( more than likely you will have to replace the carburetor) ( you might need to replace the coil as well if you don't have spark ) get your voltmeter and test and see that the starter/generator is making power they are known to fail

Faster then a speeding E Revo
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post #6 of 15 (permalink) Old 4 Weeks Ago Thread Starter
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Thank you

@ CAM2 & MrKitty. Thanks, at least I now know its a 43cc, what kind of coil to buy since I basically know I fried the coil. The starter turns it over pretty good. Idk why I wasn't thinking clearly. I was good at small engines at one time, especially carbs and getting them to fire. I definitely applied 12v to the coil which is probably where I saw the puff of smoke come from when jumper arced. I guess I was thinking it needed 12v to the coil??? Smh....weedeater don't have 12v....lol. I have never seen a starter/generator on a weedeater engine like it. I will get another coil because I can smell it and it reads zero ohms from ground to black wire, ground to red wire, and ground from wire to wire. I will focus on getting it to fire, cleaning carb first then buying one if needed...then if I decide to use electric start, lights (all lights, accessories actually work) I will cross that bridge when I get to it. I found a couple 1 position 4wire key switches in my garage that will plug right in....I think I bought them for buggys I had. As far as wiring, if I get it to fire and run....it sounds like the red/black wire close and green blk/white wire open when switch is in on position, then red/black open blk/green close in off position? Did I understand correctly? It seems to have good compression, all but the ignition switch of wiring looks like its ok (for now).....doesn't look like it was rode much and most likely stored out of rain. Nice looking mini choppers you have there. I bet the 2 engine choppers are fun to play around on. I will probably flip this mini chopper and get something a little more powerful to play around on. I got one of those Panterra 125cc bikes that I have about completed and a 01 Suzuki quadrunner 160 along with an 86 Honda fourtrax 70cc that I will be finishing up on with the chopper. I'd like to find one like you posted pics of. What do I search for to find one? Thanks again for your replies, its nice to post questions and get replies.
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post #7 of 15 (permalink) Old 4 Weeks Ago
Re: Ap

There is no power to the coil, that's on a 4 stoke engine, The magnets in the flywheel pass the coil and make a spark to the plug. The one or 2 small wires off the coil are for grounding the coil to stop the engine. If you have two wires, one goes to the key or a button on the handle bars and back to the coil. When you push that button it grounds the coil. Or you can touch the 2 together to stop like I do on my engine test stand.
Also the generator has 4 brushes, 2 to make 13.7 volts AC and 2 to start the engine. they run the 12v to a rectifier to make DC current to charge the battery and run lights etc.

Empty Pockets Racing: The difficult we do, the impossible takes longer.....

Last edited by EPR; 4 Weeks Ago at 02:11 PM.
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post #8 of 15 (permalink) Old 4 Weeks Ago Thread Starter
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Recoil part # or link

Hey guys. I forgot to mention that I need a recoil for it and doing some searching I see there are some that look identical but are different sizes for the 43cc...even seen one where you have to buy a different cog I thinks its called but I think I'd rather stick with what came on it....I don't have one to go by. That was the only major thing missing was the recoil but knew how cheap the parts had become for some of these China bikes so I took a chance. Its 2.5" from center mounting hole to next, and 3.75" diagonally hole to hole. If any of you could tell me a part # or post a link I would greatly appreciate it. Like you said, recoil is the easy way but I need to get one. Thanks again.
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post #9 of 15 (permalink) Old 4 Weeks Ago Thread Starter
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Thanks about coil & info

EPR, yeah I have been working on nothing but 4-cycles....the is first 2-cycle I worked on in a while. Lesson learned, I also usually use a fused jumper too....got in a hurry and look what happened...lol. Once I find a recoil and it gets here I can tinker with it better. Already to engine of and mounted to stand....I did see the rectifier so I figured it was AC. Unless I missed something or remembering wrong, it seemed like it was just the one starter cable coming from that side of engine, I don't remember seeing but the two wires from coil for sure, and think just one cable for starter on the other side. I'll post and let ya know if was just the cable. I was hoping out of the 8-10 blowers I got laying around that I would have a recoil but don't think I do. I may take a break from it until I get a recoil and work on some of these other bikes I have. Thanks, you all have been a great help.
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post #10 of 15 (permalink) Old 4 Weeks Ago
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Re: Thank you

Quote:
Originally Posted by dgmenace73 View Post
@ CAM2 & MrKitty. Thanks, at least I now know its a 43cc, what kind of coil to buy since I basically know I fried the coil. The starter turns it over pretty good. Idk why I wasn't thinking clearly. I was good at small engines at one time, especially carbs and getting them to fire. I definitely applied 12v to the coil which is probably where I saw the puff of smoke come from when jumper arced. I guess I was thinking it needed 12v to the coil??? Smh....weedeater don't have 12v....lol. I have never seen a starter/generator on a weedeater engine like it. I will get another coil because I can smell it and it reads zero ohms from ground to black wire, ground to red wire, and ground from wire to wire. I will focus on getting it to fire, cleaning carb first then buying one if needed...then if I decide to use electric start, lights (all lights, accessories actually work) I will cross that bridge when I get to it. I found a couple 1 position 4wire key switches in my garage that will plug right in....I think I bought them for buggys I had. As far as wiring, if I get it to fire and run....it sounds like the red/black wire close and green blk/white wire open when switch is in on position, then red/black open blk/green close in off position? Did I understand correctly? It seems to have good compression, all but the ignition switch of wiring looks like its ok (for now).....doesn't look like it was rode much and most likely stored out of rain. Nice looking mini choppers you have there. I bet the 2 engine choppers are fun to play around on. I will probably flip this mini chopper and get something a little more powerful to play around on. I got one of those Panterra 125cc bikes that I have about completed and a 01 Suzuki quadrunner 160 along with an 86 Honda fourtrax 70cc that I will be finishing up on with the chopper. I'd like to find one like you posted pics of. What do I search for to find one? Thanks again for your replies, its nice to post questions and get replies.
I posted 2 links one from ebay and one from amazon for the coil....

As for the recoil....Take a pic of what pawl you have...…….

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post #11 of 15 (permalink) Old 4 Weeks Ago
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Re: Recoil part # or link

Quote:
Originally Posted by dgmenace73 View Post
Hey guys. I forgot to mention that I need a recoil for it and doing some searching I see there are some that look identical but are different sizes for the 43cc...even seen one where you have to buy a different cog I thinks its called but I think I'd rather stick with what came on it....I don't have one to go by. That was the only major thing missing was the recoil but knew how cheap the parts had become for some of these China bikes so I took a chance. Its 2.5" from center mounting hole to next, and 3.75" diagonally hole to hole. If any of you could tell me a part # or post a link I would greatly appreciate it. Like you said, recoil is the easy way but I need to get one. Thanks again.
Theres 2 pawls that came on the mini harley...GSMoon and the rectangular type..


Here are the links to both from amazon

GSMoon type

https://www.amazon.com/HURI-Recoil-S...s%2C138&sr=8-2


Rectangular type

https://www.amazon.com/Recoil-Starte...s%2C138&sr=8-4

FYI the GSMoon is the better pullstarter setup over the rectangular type

Good Luck

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post #12 of 15 (permalink) Old 4 Weeks Ago
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Re: Thank you

Quote:
Originally Posted by dgmenace73 View Post
@ CAM2 & MrKitty. Thanks, at least I now know its a 43cc, what kind of coil to buy since I basically know I fried the coil. The starter turns it over pretty good. Idk why I wasn't thinking clearly. I was good at small engines at one time, especially carbs and getting them to fire. I definitely applied 12v to the coil which is probably where I saw the puff of smoke come from when jumper arced. I guess I was thinking it needed 12v to the coil??? Smh....weedeater don't have 12v....lol. I have never seen a starter/generator on a weedeater engine like it. I will get another coil because I can smell it and it reads zero ohms from ground to black wire, ground to red wire, and ground from wire to wire. I will focus on getting it to fire, cleaning carb first then buying one if needed...then if I decide to use electric start, lights (all lights, accessories actually work) I will cross that bridge when I get to it. I found a couple 1 position 4wire key switches in my garage that will plug right in....I think I bought them for buggys I had. As far as wiring, if I get it to fire and run....it sounds like the red/black wire close and green blk/white wire open when switch is in on position, then red/black open blk/green close in off position? Did I understand correctly? It seems to have good compression, all but the ignition switch of wiring looks like its ok (for now).....doesn't look like it was rode much and most likely stored out of rain. Nice looking mini choppers you have there. I bet the 2 engine choppers are fun to play around on. I will probably flip this mini chopper and get something a little more powerful to play around on. I got one of those Panterra 125cc bikes that I have about completed and a 01 Suzuki quadrunner 160 along with an 86 Honda fourtrax 70cc that I will be finishing up on with the chopper. I'd like to find one like you posted pics of. What do I search for to find one? Thanks again for your replies, its nice to post questions and get replies.
Yes just as I explained when the key is thrown the power is distributed and at the same time the killswitch is deactivated or ungrounded and when the power is killed from the key being turned off the killswitch grounds the coil and kills the engines function or ability to ever start...

when I test my coils I usually get 3.13 kohms out of them with the meter set at 2000kohms...….

The twin engine one was loads of fun....Both engines were modded to 4-4.5 hp each so combined I had roughly 86cc's of combined power with roughly 9hp......It did a nice respectable topspeed of 50mph...…

Sounds like you have some funtoys..I have quite a few myself....Kind of too many to list but heres a short rundown ...…...LOL

88 CR500 with 540 stroker kit , 83 YZ490 , 89 KX500 , 89 KX250 , 01 XR100 w/121cc BBK,01 KX125 , 1988 KX125 ,02 PW80, 83 YZ80 , 89 Honda CBR600 with USD forks from an 02 954 and an 04 CBR600 tail/seat mod, 83 Yamaha Maxim 750 bobber, 1982 Yamaha 1100 bobber lowrider , 2001 Suzuki GSXR1000, 2008 Kawasaki Ninja 250R , 2001 Harley Xl1200 Sportster Sport , 01 Harley Heritage , 04 KX450 ,02 CRF 230,10 Yamaha WR250,1998 Honda XR400,03 CRF450,01 DRZ650 with 790bbk ,09 KXF250 ,2013 BMW S1000R ,1985 Honda Big Red 250 trike , 1989 Yamaha 225 trike ,Can AM 800 quad , 01 Banshee 350 w/421 stroker,02 Blaster w/1979 YZ400 engine on it,2013 Yamaha GPS 1800r waverunner , 2001 Kawasaki 1100 ZXI jetski , late 60's IAME powered racekart that goes 133mph and a mid 80's jr kart with 100cc engine and a bunch of stand-up scooters…….

These are basically a few of the minis...…….I had quite a bit of them as you can see...………..LOL







Good Luck
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Last edited by CAM2; 4 Weeks Ago at 07:58 PM.
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post #13 of 15 (permalink) Old 2 Weeks Ago Thread Starter
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Recoil

I have the GSmoon pawl....ordered recoil and 2wire coil with 2" bolt pattern. Should be here shortly. I did test coil and its shorted. Thanks guys.
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post #14 of 15 (permalink) Old 2 Weeks Ago
Re: Ap

That's very typical with coils. The Moon GS is stronger than the alum rectangle with lever, I have both typs in different engines. eBay is a good place to look for parts

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post #15 of 15 (permalink) Old 2 Weeks Ago
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Re: Recoil

Quote:
Originally Posted by dgmenace73 View Post
I have the GSmoon pawl....ordered recoil and 2wire coil with 2" bolt pattern. Should be here shortly. I did test coil and its shorted. Thanks guys.
Yep just like EPR said;- it is typical especially when people try to hotwire them wrong...

The Chinese were very crafty to make such a simple thing look go together and operate the hard way and make it look way more intimidating than it really is.....LOL

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