I've gotten myself into it this time lol. I was looking for some smaller quads on FB Marketplace for my grandkids, maybe a project to work on and repair, maybe have them help if I can keep them focused so they can learn how to work on them themselves.

Ended up buying these 2 quads, they're identical. All that was posted on the ad was Yamoto 1, and that the owner bought them as projects and never got around to messing with them and was wanting to get them gone as he had too many projects laying around.

Both filthy, both missing carbs, both batteries dead, wiring looks a mess. Controls similar to a bunch of other chinese quads I've seen in vids but slightly different. Body kits look similar to a bunch of the ones I've seen on like vmcchineseparts.com for the kazuma, etc. but not quite. One of them has a redcat sticker on the rear fender of the body kit, but I don't know if that's even the original body kit for it let alone if it's really a redcat or someone just slapped a sticker on it.

Anyways, I get them home after an hour and a half drive, unload them and go to bed for the night. When I go look at them the next day I notice neither of them are chain drive, looks like a shaft drive I guess? First quads, never had an ATV or motorcycle before so I have no idea what I'm looking at.

What I do know is everything I can find on all these various brands of chinese quads indicates they're all chain driven, which these clearly are not.

Anyone know what these are? Any resources you can point me to on what changes in terms of teardown and reassembly/troubleshooting with it being a shaft driven instead of a chain drive?

What way would you attack this - buy a new carb, battery, wiring and see if the motor runs and if it will move before tearing it apart and cleaning it all up and then fixing it up fully from there, or tear it all down first? Other than getting one running and seeing if it moves, is there any way to test whether there's going to be issues with that shaft drive that I'm going to need to address?



Started investigating one of them today and found a sticker on the frame that's worn off and can't read it at all, what looks like a VIN stamped in the frame that I can't quite make out even after trying to clean the area up a little. Camera isn't getting a good pic and can't see the screen to tell how good I'm focused because it's bright as hell outside. Vin looks to me like VINXCD0440E0149

 

Well, Yamoto pressed into the engine covers would indicate that is what you have. Yamaha made a range of shaft drive tiddlers, YFM50, YFM80, YFM90 and Yamoto seem to have copied them. I guess the engine will be the usual Honda clone, but with a bevel drive box where the sprocket normally is. The rear end is a fairly faithful copy of the Yamaha. Even on Yamahas, the rear end was regarded as weak but, if yours are OK, they are fairly decent quality bikes. With a mixture of Honda clone, Yamaha Clone and generic Chinese parts, you are going to have your work cut out deciding where to source the missing bits, but that is usual with Chinese stuff anyway.

See if you are getting a spark, check compression, change oil and get a carb, then see if it will start. Check it drives OK and do the same with the other bike. Finding plastics and seats will be your biggest headaches. Many Chinese makers copied the Yamaha YFM plastics but how closely, I don't know.

 

I've had a couple of these body styles and they were Baja and Yamato brands. Baja seems to be the most popular to find parts for.

 

OK, got the last of the plastics off and oh boy is the wiring on this entire thing shredded. I doubt there's any way I get any life out of this thing without completely replacing the wiring harness on it.
So I pulled the stator cover and it's a 2 coil stator, the CDI is 4 pin. Now I can't seem to find any complete kits with a 4 pin CDI. Are the kits with the common 5 pin CDIs and the 2 coil stators able to be used as a drop in replacement? My instinct says yes since the whole kit is matched and sold as one, but I don't know enough about these motors to know if that's a problem

 

A four pin CDI has to be DC ignition. Not sure what a two coil stator would be. There are different sized flywheels, so some two coil stators may not be the same size. Answer would be to buy, or wire up your own, DC ignition set up using the existing stator, which does not control ignition anyway, except for the trigger coil, on DC CDIs.

Just googled it and found this https://atvconnection.com/forums/1-e...ted-below.html which don't follow DC ignition systems either, I wonder if it is a genuine Magneto system, Suzuki LT50 and LT80 use variations of that system, dead simple, but difficult to explain. Basically, the trigger coil doubles as the power coil. If it is, there won't be an external trigger coil on the outside of the flywheel.

 

For posterity, and in case anyone else comes along wondering some of the same questions I did, I can answer at least one of them now:

Yes - if you have a chinese quad that had a 4 pin CDI DC system, and the wiring is all fucked, and you are wondering if you can replace it with a full 5 pin CDI AC system wiring kit (regulator/rectifier, CDI, multifunction switch, coil, wiring harness, and stator that matches the stator type in your machine - size, shape, and number of coils) yes you can.
Put in the new stator, use the new harness, regulator, cdi, switch, etc. - take off all the old stuff, and as long as everything in the kit is properly functional and the pickup on the stator is adjusted correctly, it should work. It should at least turn over and you should get spark.

I had some problems at first, had to find the right place to plug in the coil and the multifunction switch, the spark plug boot on the coil ended up being bad (no continuity and infinite resistance from one side of the boot to the other). Had to unscrew that from the wire and replace it before I got spark.
May still have a problem with the stator, it's only outputting 30VAC when cranking instead of the 50 I keep reading is normal, but... I was able to get it started. Got a carb on it, got some fuel in the bowl, and it did fire up and run on the gas in the bowl.
It doesn't want to restart now, but I did have it running. I may have run the battery down a little cranking on it, and honestly the gas I had is a few months old so it may not be the best. Gas tank someone busted the petcock, so I need to deal with that... and the other quad the gas tank has what sounds like rocks rattling around in it and the petcock leaks like crazy.
But... there's signs of life here! I've gone from absolutely no life at all to engine running for a minute on gas.
Now to figure out why it doesn't want to fire again Edit: Don't be a friggin numpty like me and sit there for 30 mins trying to start a quad with the kill switch engaged.

 

Wanted to comment (new member here).. I came to this place because I also have a no name chinese atv. Mine labelled a Jackel, but it's the exact same rear end as you have. Same looking engine, intake.. mine has no plastic but everything else is there. And like you mine needed a complete wiring job.
So the one I have is a 110cc, 4 wire stator, 5 wire CDI (except the actual cdi was only 4-wire). I ended up buying one of those ultra cheap wiring harnesses off Amazon, but to be honest atv/motorcycle's are new to me. So I have no idea if what I have is DC or AC but the generic wiring has 5 wires it's expecting from the stator, one of which is supposed to power the CDI.

Anyway Im glad I found your post because I wasnt sure how much voltage should be exiting the stator.