I have two TaoTao 110cc buggies for my boys.
They have been sitting for about 3 years.
Replaced the Carbs, Plugs, Fuel, Filters, and Batteries.

First one started right up and ran for about 2 minutes.
Cant restart.
The motor will not turn over.
Batteries show full charge
You can hear the starter try to turn the motor but it just wont turn over
I took the spark plug out and the motor turns over (no compression)
I pulled the starter and it turns with the key when not trying to turn the motor so I know the starter at least turns
I hooked up a charger to them as well to be sure they were getting enough amps but didn't make any difference (3amp and 12 amp setting)
I have the same exact problem on both buggies

It sounds like the starter does not have enough power to fully turn the motor over

Possible problems? Seized motor, Bad starter, or possibly crappy battery without enough cranking amps??

Any assistance would be greatly appreciated. TIA

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Check the connections on all thick cables, earth leads and live from battery to solenoid, to starter. Very rare that starters get "lazy" they usually work or don't, but worth checking brushes inside, they can stick from disuse. Check the battery voltage when turning engine over (or trying to), it shouldn't drop much below 9v. If it does, your batteries are probably shot.

 

Thanks, I did check the voltage while starting and it drops real low. The batteries are brand new though. I also tried starting while I had a charger hooked up just in case the batteries were junk and it didn't seem to make any difference. I also "monkeyed" with all the wires to see if something was loose but didn't seem to make a difference either. I ordered the Coil, Solenoid, Relay, VR, & CDI bundle from amazon so I'll try replacing some of that to see if it makes a difference

 

OK, so I replaced the Coil, Solenoid, Relay, VR, & CDI module and still nothing. I also unhooked the battery and hooked up a brand new Optima Red Top to make sure I had enough cranking amps. Still tries to turn over but just rolls once at best. The only thing i could think of at this point is the starter but if I remove it it turns when i turn the key so it would just have to be weak. Could the cylinders have gotten moisture in them and maybe rust so they wont turn. Problem is I did get one started at first and ran it for a few minutes before it would do the same thing as this. I am at a loss.

 

Well that "Coil, Solenoid, Relay, VR, & CDI module" were never going to fix a starter issue were they? Only the solenoid is part of the starter circuit and it was obviously working because the starter was trying to go. Yes, you could have a seized engine, take a side cover off and the plug out and try to spin the crank by hand if you think this could be the trouble, but my guess is bad battery, a bad connection, or sticky brushes as I outlined earlier.

 

I’m having these similar issues. I have two 2020 tao tao 110 quads. First one struggled to turn over but I got it running. Turns off while idling after if I stop riding it. The second when I try to turn it over sounds like a sluggish crank. I also noticed the headlight isn’t as bright when trying to start it. From the research I’ve done I understand why OP replaced all those components. My questions for you are 1) what do you mean by “Sticky Brushes” and 2) do you think the stator could be the issue?

PS I replaced the carbs, plugs, and batteries already

Thanks in advance!

 

The starter motor brush holders can corrode (if steel) when a bike is laid up. This stops the springs from moving them in as the brushes wear. First start after lay up will be OK but, as the brushes can't compensate for wear, the starter gets intermittent or lazy. Regarding the "Coil, Solenoid, Relay, VR, & CDI module" ignition components have NOTHING to do with the starter circuit so, solenoid apart, can't make any difference to the speed of the starter motor. One exception, over advanced ignition timing will make the engine try to backfire, slowing the starter. Easily checked by taking the plug lead off and seeing if the starter turns the engine any faster. When starting the engine, the stator only controls ignition timing.

Check those thick leads and the starter motor, they are the cause of most starter problems. Also a new battery isn't always a good one.