I know that as of today this vid is almost 4 years old, I watched it when it was new. I just bought one and this information was priceless. Sometimes you never know when you'll need information like this and knowing where to look is key. Thanks Harvey.

Thank you!!! I just got a brand new wiring harness for my 110 and installed it and it had no spark, so I got to 111 in your video and saw the part about the yellow black wire on the cdi going straight to the coil, and looked over my wiring again and saw that I had the cdi plug plugged into the hand control and the hand control plugged into my cdi, now I’ll change em around. Thank you so much, your a life saver

You are the best teacher I have seen on thje net!! Thanks Harvey!

Damn! After all these years I finally understand it! Presented in the Exact format in which I learn. Thanks!

I have an Alpha Sport Cobra 180. I was told all it needed to run was a new wiring harness. I was given two harnesses with it. Hopefully, the information you provided here will help me get closer to getting my quad to run.

By the way thanks for the video on wiring that up. U the only person i have found that knows what he is talking about when u are explaining your technique!! Thanks again bro

I just snagged a SUNL ATV-109 today from a co-worker that needs to have the battery charged, carb cleaned and a good romping to clean out the cobwebs. Maybe not in that order. He also told me that it runs great for about half an hour, then it shuts off and wont start again until it cools down. I've watched a couple other videos and done some research but your video not only laid things out better than everything else but also made more sense. Thank you!

Awesome info. Great to have someone such as yourself able to explain things in simple english.

I like the way you explained with the basic 12 V with the scooters and the quads doing a good job I've been mechanic for years and just started playing with the scooters and these Chinese wiring is so undependable keep up the good work you got my vote

Dude, you ROCK! I can't find shit for info on these until I found your video and got a deep understanding. Can't thank you enough for making this video!!!

Once again I come to you for instruction,your the man Mr. Spooner! THANK YOU VERY MUCH AGAIN!

Mr Spooner you are very kind for sharing your expertise on this topic.. keep it up. And thank you.

This is an awesome video especially for someone that might not understand ignition systems too well. You're a great teacher and well thought out. I'm subscribing!! "It's a good idea if you like getting hurt because it's probably gonna break and you're probably gonna crash so... whatever gets you through the night I guess."

Thanks for the info. My problem was a corroded kill switch causing resistance in the Run Position killing the spark.

I'm sure many people will have lots of fun on their bikes after you helped them to repair it

Harvey thank you,I bought a Honda 110 for fifty dollars . Pretty much complete. It even had the tools,that are kept on the frame .The fenders were just faded a bit. I could not get spark I worked on it for about 6 hours and I came watched your video and you said you got no ground you got nothin. So I ran ground wires everywhere and by gosh I got spark and it started up right away. I thought it was grounded all ready but it wasn't. The bike had set in a Barn for over 15 years . Just think just because of a Ground wire . Thank you. Oh I also have a little Chinese quad 110 and a 250 They are okay could be better if they made their frames stronger. I

Awesome ! Seriously, thanks bro. I wished I found this videolike two weeks ago

I have this engine with the same electricle problems but it has a 50cc head instead of a 70cc or 110cc head! But thanks for helping me fix my engine!

Once again Harvey, I'm up and running thanks to your tutorial !! You are da man !

Very good Professor, you know your wiring inside and out. I have taken notes. Take care

hi harvey thanks for the video i followed it and my wiring is identical to the one you have in the video. i was able to get the lights/horn an starter but i still get no spark to the plug. will be replacing the CDI next. but not sure what else to check on. got this from someone that has had it sitting out for a while so slowly getting back into running order.

Thank you so much. The way you explain this is so easy to understand. I really appreciate it.

It's really nice of you to take your time to sit down and do this video just for others. I for one thank you, even thought it's not for me. Everyone needs a refresher course from time to time. Thanks

Good job Harvey...interesting tutorial.

Very well explained! great details, and great video, you earned another subsciber!

Thanks dude. Removed the white black wire coming from the ignition lock and it worked.. it seems that the ignition lock dont work right anymore and the black/white is all the time on off

any info on removing/eliminating wireless receiver [ wireless remote kill switch ] from wiring harness? thanks

Thanks that was a great help. greatings from Denmark

Pretty good explaining video pretty helpful my still not runing but, but after wach this I know there is a hope to Bring it back to life, thanks 😉

2008 50cc scooter won't start. Ran in 2018. So-so start but got it running. Ran OK for 3 months. Couldn't start one day to go to work. Ugh! Things I've done. - Checked battery volts = 12.5V - Installed new spark plug = good spark - Installed new carb - New gas filter. Checked gas flow post-filter using cylinder vacuum = Good flow. Now what? Stumped. After installing carb, do I need to prime? Doesn't look like gas is getting to spark plug. Plug looks dry. Any suggestions or questions? Thanks for the support!

I’m going to try your diagnostic. I really wanna learn these Chinese quads.. its interesting ..

Hi Harvey, I saw your video and it has helped a lot. First of all I have a quad MPX 150 and it had a spark once (just one I saw it with a test plug but no more). I have checked the wires you mentioned and they check good (ohms, continuity, etc...) but I have a wire I can't determine where it goes. It is coming out of the engine in that five wire configuration you talked about and it is Red/Blk stripe. It has a single female terminal but no other male anywhere to be found. It reads 400 ohms. HELP!!!!!!!!!!!!!

I have a modified honda cub that has a 125cc hondamatic, it got soaked by sprinklers one night and hasnt started since, its kickstart only. I ended up replacing my cdi, coil, plug, reg/rectifier and still no spark? Thanks for helping all of us!

Great and informative thank you all the best for your future

I have a question about my jeep style 125cc go cart. I can turn the key and I can hear the sound of the starter but that's it what would it be

Hi good video I'm working on one of these at mo 50cc semi automatic. Got a weak spark or no spark at all . I'm suspected stator so far but unsure of the output voltage. In my case (red and white trigger wire) (red and yellow goes to the cdi main) (Green and white is earth) ( yellow to rectifier) and (white to rectifier) .What should be roughly the voltage on Cranking best Regards James

Great vid. I got one question though, I bought an aftermarket wiring harness, but the red (power) wire from the battery is pretty thin. Is it possible that it's not thick enough to pass the current to the rest of the wiring harness ?

I appreciated the video. Can you tell me what to do with the information I obtain? I'm not getting a spark. After I identify the wires, ensure there is spark, test the ohms, what is next?

videos have all helped. i have a request, i am in the few with a chinese gy motor made by lifan. trying to find information on it is rediculous and u mentioned it. what makes it different? mine is the 150 or 200cc enduro and the wiring i redid to cut out the extra wires. its my first bike and i think im making it harder then it really is. im familiar with cars and work on my jeep. @12;12 is where u mentioned it. thank u for the great videos

I have a 2008 Baja 110cc quad. I'm getting fuel and spark. Starter and solenoid are new. New spark plug as well. My problem is, it cranks and cranks, but doesn't turn on. Everytime when it cranks, you can hear some noise from the exhaust (like a popping noise as if it wants to turn on; with the choke closed AND opened). But, I bought this from an amateur mechanic who, which had appeared to open the valve end of the engine, and who also stripped the spark plug entrance (it goes in fine all the way with a rachet and in small areas, it tightens up, but it keeps spinning when you try to tighten it on the last thread). I have yet to use a multimeter, but I will be buying one tomorrow. I've only been using a fuse checker (one of those tools w/ an alligator end that lights up when you touch power)

Hello Harvey - i have found your videos quite helpful - i understand the basics but solid state ignition systems were always a mystery to me - thanks to your videos i now have a clue when it comes to CDI. I have a chinese quad - i believe 110cc - not starting. Kick start is broken and only use electric start. There is spark as starter first engages but then stops as cranking continues. I followed your troubleshooting and red wire out of the case - it is there but not connected - has an insulated female lug that goes nowhere. Come to find that the cdi gets 12v dc somewhere from the battery circuit. When i crank i see the voltage to the cdi drop to about 8vdc. I measure the power from the case as 50vac - should i connect that direct as to the cdi power (black/red)? Any other recommendations?

I have a 125cc coolster when I go to turn on the key switch some of the wires start getting real hot to where it melts the plastic insulation off the wires . What could it be.??

How do I bypass the key switch. It has four wires white black red green. Thanks for the help

Bought a used Baja 50cc engine. I was told it had low compression and would not run because of that. I didn’t use a meter, I took the spark plug out, jammed my thumb in the hole and kicked it. compression seemed strong. I checked spark and it does have very strong blue spark. Timing is on point. Cleaned the carburetor immaculately, but nothing. Took carburetor off my honda xr50 which I built from an empty case so i know its 100% working and threw that on, still nothing. Thought cause I didn’t use a meter maybe the compression it does have just isn’t enough after all, so I replaced the piston and rings. Compression isn’t the issue now, spark doesn’t seem to be the issue, and since my honda runs, i don’t think carburetor is the problem either. Whats next? Should I replace the entire wire harness? Should I take the entire engine apart and check each individual part as I reinstall everything? Tbh idk where to go from here. Starting to get frustrated with this now.

Hey I have a question, I have 4 wires coming from my engine which are 2 gray wires and a black wire then a white wire what do think I should?

Hi Harvey. I really enjoy watching your videos. You mentioned the gy6 DC in this video. I have a gy6 150cc buggy that is 12VDC.....my question is it has a voltage regulator and I'm wondering what it does when the voltage coming from the stator is DC? Most, like you said, turn the 12vac into 12vdc to charge the battery so does that mean that on a DC stator, that the voltage regulator isn't needed or does it do something else? Thanks

Great video! Very easy to understand. I have a 2010 Gio 200cc atv. I'm having trouble with intermittent spark. Every reading is good. My black red is only 295. My blk yel is only getting .5. New cdi blk yel got 1.1 now only 0.5. Any help or suggestions would be great. I'm thinking cut everything out and start over? Looks like someone was experimenting with subpar connections/splices.

very helpful informations, thanks man.

Harvey I need your advice, I have a 90cc 4 stroke believe it's a kazuma engine. I recently replaced all the wiring, along with stator, rectifier, coil, starter solenoid, ignition switch, everything due to some wires shorting out. When I replaced everything,it fired up in 1st try, a couple days later it wouldn't start. Had low compression, so I tore into the top end to check everything. Ended up replacing head gasket and stuff. Found both valves,so took them off, removed all the carbon and re installed, and adjusted the valves. Re installed engine, put everything back together, and I have no spark. Checked all the connectors, all "look" good. I have a multimeter but it's too fancy for me, can't figure out how to use it 😂. What do you think it could be? Thanks.

Juat what I was looking for . . thanks

Great video and instructions.

Harvey I have a question. Do I need to leave the battery hooked up to the atv after starting or is ok to start it up and removing it. Thank you Harvey.

Hi,I m glad u r a good teacher I have a a 49cc Yamaha scooter

Very helpfull info i enjoy it much just as a self tinkerer!!what is purpose or pros n cons of this three phase stator or functions of having one vs two and two having three wire phases??snookie pa.💥👍🖐💥

Hi Harvey.. Thanks for the video. I'm replacing a stator on a 95 Honda elite 80 scooter. Found an aftermarket China made very close but may have to swap a wire. How can I find out if my scoot is AC fired?... Thanks.!

Bro im a airhead and i was wondering if you could show me exactly where to hook my wires up to if i showed you a pic of wat wires i do have

Great video Harvey. I have a question for you. I have a 2006 hammerhead 250 go kart that I am not getting spark on. I bypassed the kill switch and the ignition to make sure it was not the problem. Still no spark. I cut the black and white lead coming out of the CDI and when I touch the wire with my fingers the spark plug has a continuous spark. I am assuming this is some sort of grounding problem. Would you agree?

Really good video brother thank you 😊

Good video Mr. Spooner

I change the coil ,cdi, regulator and magneto and y has fire on the spark but just for a moment and no more fire again in the spark?

ok so i got a 1977 honda 90cc 3wheeler symple wiring but nothing was conected ar the head light and to beleve i got no sparck not to mentchion no cdi when i puled evering like the wiring has no way on one but i cant find any wiring diagram to hook anything proper and it came with out the head light im sure somthing is missing i just need the engin running for a gokart i built from ground up ive been on the gokart prject for 2 years now due to trying differnt engins non witch wold run due to wiring this is the typ of engin i want on it regard less cuz i want a manul gokart so i cant due the engin mount on it till i know i got a running engine that will run appon finishing the gokart putting the engine that rins in order to wire up the kart any help like step by step would be great.

hey is this same as a gio beast 200cc I cannot figure it out for the life of me previous owner hacked it up

Harvey,I have a 2015 Velzo 125 Atv. My problem is when I turn the key to the start position , I get nothing. I replaced the battery and still nothing. Your thoughts! Thank you

Hello and Thankyou for your video I’ve got a loncin quad I’ve been working on. It’s on hold at the moment but I got it running and was ab oh t yo start painting it etc and all of a sudden no spark? Oh well I’ll get back to it soon

I hotwire my Chinese 110atv with gears and it only fires on time when I tucked the ground wire and ideas

hello Harvey , I have a 250 quad , and I have 4 wires coming out the engine , 3 yellow 1 green , I ideas what they do , as I have no spark

Can you help with transmission issue? It takes forward and reverse but it won't pull. Please help

Hey man I'm not getting a ground out of my green wire from the stator. Do you know what could be the issue. It's a universal wiring harness and I can't seem to figure it out

Can I know where the black wire comes from that’s on the ignition coil cover?

hi i have a 2007 chinese panther 250cc zongshen engine air cooled manual trans it has the skater wires and another harness with 5 wires coming out about a inch from the skater and the new harness dont have them any ideas thanks ed

How do I splice into my harness to add the extra coil for my dual cylinder I bought a brand new china wiring harness that has a single coil from what I understand I can just slice into it??

Thanks a lot man I watched all your videos went in the shop and cut the black and white wire coming from the cdi and boom I got spark it runs great other then it won't shut off lol thanx again

Can you explain the simpler systems that don’t have batteries and a starter. If I could get/find a real schematic I wouldn’t be asking. I “assume” the CDI gets power from the generator portion of the stator and the spark signal comes from the igniter pulse. Also, what voltage does the generator put out to the CDI and Coil if there is no voltage regulator. Im assuming it’s AC but don’t know the voltage. Im asking because I would like to build a tester that sends a pulse to the coil to do a quick easy coil test for process of elimination. Would also like to remove the plug, spin the crankshaft with my drill and measure the generator and igniter voltage coming out under fairly consistent rotation speeds.

have a coolster while checking spark it sparks and then quits until you bump it again sparks about 5 times and quits again any answers are greatly appreciated

Can you do a video on how to set up a whole fresh new wiring harness on/off switch key switch & battery electric start on a fresh engine clean frame so we can see how to set things up ? You help but you not really hands on...

I had spark yesterday bikes really mangled but I tried to get it going again today but no spark

Which voltage is suppost to be generated by the puslegenerator? I´m not sure if mine is broken.

This is so good! Thank you so much!!

I have (from the engine) a 'yellow, white, blue/white, and black/red' but the green that you have is green/white for me ?

hi I need help with my Chinese 250cc it had been parked up many years I have come to get it working and the ignition barrel hasn't got any wires to it. I have tried starting it with a booster pack and it sounds like it wants to start I've changed the spark plug and it's still not sparking

I have a Yamaha 225DX 3 Wheeler, it turned over fine and used to run great. But now it's not getting any spark. How do I check all the little box things between the engine and the Coil. There's like 3 little box things between the engine and the coil. How do I check to see which one of those is bad?

i have 11 pole stator 5 are the common wires and 6 are different. 1 is solid white and others are white with red lines. Is this a gear sensor? 1 for neutral and 5 for each gear? will this effect starting my motor? they are cut from there connectors. do bikes function like cars neutral safety switch?

I install new stator, ignition coil, spark plug, cdi, regulator and still no spark. What can i do?

hey buddy I got the Arctic Cat 400 running I used to harness and the CDI and direct the prior off of my big bear Parts bike and hooked it into the the poster and the stator and it started right up

Do they make a three phase for this style engine? If they do I would like to upgrade mine tail lamp flashes at idle three phase should eliminate that. Oh and my engine is on a scooter originally 49cc upgraded the jug to 88cc.

I’ve got power from black and red.hooked everything up as explained and still have nothing.it was all wired fine untill I put the jump pack on now I’m just getting nothing any suggestions.and if I’ve got power from the stator does that Jean everything under the stator is fine

Hey I have a question for anyone who may know, I'm trying to get my 50Cc Chinese dirtbike started qnd I only have a simple tester, but only the black with red lights up and same with the cdi box only one lights up and I'm guessing that's the positive, does anyone know what it could be specifically

hey Harvey I'm working on a Suzuki Eiger lt-a400fk and I was wondering if the pit bike cdi system on one of your outher vids would work for that

Hi help needed asap !! Ive recently purchased a new loom but plug on from stator doesn't match up to one on loom ive cut both plugs of now and am going go join them up then tape them off which colours go to which ??

I have sparl when i take it out but when i put it back in it doesn’t start, im guessing it’s no spark issue but im not sure.

I have a question? I have a 50cc 4stroke with electric start. It wants to start it "churps" an it gets fuel but no spark, i went through 2 spark plugs an still nothing?

hi Harvery the pulse generator doesn't have any power coming to it, but the others are live... what now? must I pull the engine apart?

i have a china quad,,,i my test light lights on both spade connections on the coil,,,is that normal

Very interesting mate , what do i need to do to run my bike without a battery ? just using the kick start ? Its got a Honda 110 engine in similar to your quad engine Do i need to fit anything or join any wires together cheers ✌️✌️

I have a life in gya5 200cc dirt bike motor and I have spark but it won't start. What could it be that is keeping it from starting???? I get back fire when I spray some starter fluid. Thanx John B. aka NDN

Can you please... Please make a video on how to just start it with kick start instead of using any batteries. I have a China bike and the whole harness was screwed. I just want to know how I can make it have spark and just be able to kick it and bypass the electric start. What would I have to hook up for me to be able to just kick start it??? Please comment asap

I went through my 110cc China quad and got the same ohm readings as you did in the stator wires and the cdi except black and red. I have swapped in a new cdi and coil, still no spark. What is the likelihood that the stator is bad? Is there a way to test it?

I need help with my bike it needs a ground frame hooked but i did and still no spark

How much would charge for a working harness. I have a china made 125cc engine. I'm not getting spark

How do I charge my 6 volt ? Nowhere to hook up, or just buy a new one?