Tao Tao Coolster 110cc Pit Wheeler Has Spark But Won't Start Motor and Compression Troubleshooting
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- čas přidán 9. 11. 2020
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I rebuilt this Chinese Coolster Tao Tao 110cc youth ATV quad earlier this Spring with spare parts after it was found to have a seized crankshaft. It was running like a champ for my nephew then just died. Cranks all day with solid spark but the motor won't fire even with ether in the filter or head. What happened?
It wasn't what I thought but boy did I feel silly once I found the issue.
This one is a model 3050b. No reverse gear on this motor.
Update 1/20/2022 - I had to trim out some music audio midway through for a copyright claim. Turned out I only needed to add a link below but I can't revert the 'mute' that I did. Apologies for the dead sound spot.
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Bro keeps a white sweater after shaping a motor. Your just amazing 😮 thanks
Thanks for the note and the thanks! Glad it helped!
Nice work man! Always a good feeling when you finally here them run again. Keep up the good work!
Great video! It really helped me restore one that had been left out in a field for years.
Thanks for showing us that mistake and not editing it out!
Hey mate nice job found the problem & solved this will help me a lot, great video & even better you left in the parts of the video you dropped tools just makes it a more realistic haha , we all have our moments👍 Great work
Awesome video,
Love your attitude.
Great video with a lot of great info this helped me a lot and I learned some new stuff
Just bought my step son a Chinese 110 atv. Ran when I bought it. Got it home and can’t get it to start. Hoping I can get it with valve adjustment but might be checking compression first!
This was very helpful! I subscribed! Thanks
appreciate the video for us diyers
“A Carolina squat” 😂😂😂
When you said valve job did you mean adjustment?
Great video, helps to understand some troubleshooting. On another note, I am surprised with all the property you don't build a nice shop with all that you do there
It's on the list for sure. :)
like the video and followed your foot steps,but have a question:
i opened exhaust valve cover to check with gage and there is oil came out..cranked and more oil coming from that valve....DOES THIS MEAN PISTON IS SHUT???
anybody???
There should be some oil in there. That’s normal. To determine if piston is open or closed find TDR. (Top dead center)
Having trouble with my lads atv 110cc chinese quad at the moment, so its been laid up for around 6-8 months but with ethanol free fuel, it WAS starting absolutely fine, iv charged the battery full and also got a jump pack on it incase it gets low - i pulled the spark plug and ground it an turned it over, its sparking maybe not PERFECT but its sparking, there appears to be fuel getting through to the carb at least - would my next port of call be firing some starter fluid down the neck of the carb with the air filter removed to see if it fires?
A little starter fluid into the air filter should be enough. Sounds like you have fuel and spark. Unless you’ve sheared the timing key (unlikely as it had only been sitting and was running when you parked it) you have mechanical timing as well. Perhaps your compression is low but overall I’d hit it with a little starting fluid, get it warmed up and running and see how it does after that. Good luck.
Would you have any idea what would be the problem with my atv ? It’s just like the one in the video. So after a day of riding it suddenly stopped and wouldn’t crank anymore. My guess was that it overheated so I let it cool down but ever since that it hasn’t started again. Where do you think I can start by looking ?
Does the motor crank by hand? IE pull the plastic cover off the stator bolt hole by the left foot well and put a socket wrench in there to see if the motor is seized. If it is seized then there's a motor issue to go after. (no oil burned it up, part broke internally etc.) If you can turn it by hand then I'd check the basics. (Did your battery short out and is dead? Did a ground wire come loose. Do you get a click when you press the start button to make you believe you should check the solenoid etc.) I'd start with the above.
@@VermontLife thanks for the reply! I followed your advice and came to the conclusion that it’s an internal problem. The smaller chain that’s inside the heads snapped. I believe it’s the chain to the cam ? So I have quite a project on my hands! Only thing is that there’s not much info on the parts for these atv’s online so I’m not sure which chain I need
@@JoseDiaz-zv3wp It would be the timing chain. It's not too bad a project. You should be able to remove it and replace it without taking the motor or head off. You'll access it by taking the stator cover off and a side cover on the head. Look for videos on timing chain replacement for tao taos and watch a video on two on finding top dead center on an atv like yours. With luck only the chain snapped and there's no or little other damage.
Can someone help me with a quick question. I have the same engine for my go cart that I swapped. Everything works perfect on the engine and I am able to push start it but whenever I hit the button to electrically start it it doesn’t do anything. please help me fix this problem
What happens when you ‘short’ the solenoid? If then engine cranks you may have a bad starter button.
When’s it’s 180 degrees off just spin the fly wheel a full 360 and it’ll all line up perfectly.
Thanks for the video. I spotted your fuel shut off valve and just realized my daughters 125cc doesn't have it 😑 😒...
I was so ready to leave the place and excited for her, a petcock was the last thing on my mind. Line only has a filter. Should I just run an inline valve or is it fine as is? I've never seen one without it before and it's the same as yours just the 125cc and I'm pissed I spotted yours 😆
If fuel isn't leaking out of the carb I wouldn't worry about it. I only turn them off when I have trouble, like a leaking carb. Or if I'm working on a carb it means I can shut off the flow rather than drain the tank.
@@VermontLife thanks man
What is the solution of this fault? I have decompression problem my chinese atv. Thanks
This one had low/no compression due to the valve not closing because of the damage. If you have fuel and spark I'd say to check your compression next.
Measuring valve clearance is not a valve job unless you meant this is a job that will involve the valves. Valve job is removal, cleaning, lapping, etc.
I also live in Vermont
Could use help in troubleshooting
I have 2 110 one runs perfect the other won’t start. I think it may be either a starter Solenoid or the starter.
When I try to start it I can hear the clicking in the solenoid but it doesn’t even attempt to turn over.
What’s my issue ? Lol. Sorry I tried looking it up.
I had a similar issue on a Moto4 225. Solenoid would click when I went to start it. I thought it was the solenoid and swapped it out but ultimately found I had a 'broken' wire. czcams.com/video/H1LS3iejDKU/video.html If that link works that's the video I did troubleshooting it that might help but your symptom sounds similar.
@@VermontLife ok so faulty ground wire.
I pulled solenoid out of non running one and put it in running run n it works fine I just ordered a new starter for it. But I’ll have a look around for a bad ground wire I know battery is good lucky I have a running one to test things on lol
Awesome, spare parts are so helpful. Mine wasn’t the ground wire but the positive wire leading up to the fuse. The ‘break’ was hidden under electrical tape so it wasn’t obvious until I pulled it apart. Sometimes it started fine, sometimes it gave me the solenoid click. Often I could shake the battery and it would work again which ultimately was resulting in me shaking that bad wire connection. Glad you found the issue.
@@VermontLife havent solved it yet but hopefully it’s a bad starter. It’s on order now
Hey I’m having an issue with my dirt bike we’re I try to start it just spins the flywheel but doesn’t engage the engine do you think I might need a new starter
Have you checked the woodruff key behind the flywheel stator to make sure that isn't sheered? If it is then the flywheel would spin but not the motor.
@@VermontLife are u talking about the the thing we’re u connect the cable to on the starter motor
No, a woodruff key is a half moon shaped ‘key’ that’s sits in a channel in the crankshaft. It ensures that when the flywheel spins the crankshaft does as well. You would need to pull the flywheel to check which implies you would need a flywheel pulled tool.
Having a hell of a time with mine, barely turns over with the spark plug in the head. With it out turns over fine. New battery thinking valve job?
Are you sure you don’t have a bad crank bearing giving some extra resistance? Try turning over by hand and feeling through the compression resistance. You’re looking to see if there are any other resistance ‘spots’. Not sure if I think valves would do that unless your valves are stuck. Good luck.
@@VermontLifeyeah me, my dad and my brother having a similar issue with our 125cc, we couldn't get spark from our spark plug so we had to replace the stator which finally gave us spark but now we encountered a new issue where the atv wouldn't start when we put the spark plug into the atv, but when we take it out of the atv, the engine moves, and causing a bit of smoke with the red wire from the battery? Any tips?
Huh, the way you describe it… there is too much compression for the starter to turn the motor over when the plug is in. When you take the plug out you then have no compression and the starter can turn the motor over… sounds like a bad starter. Then you have the smoking red wire. Sounds like you are really overloading the circuit. Feels like you have resistance somewhere and/or bad starter.
On my 125cc atv I checked it for spark and it did than replaced the head with a brand new one and it still won’t run or sputter when cranking over and I checked the timing and it seems fine and I did put fuel down the carb and it still won’t run have any ideas?
Electrical timing, sounds like you checked the mechanical timing by inspecting the timing gear and chain etc. a bad stator, bad stator wiring or bad CDI could cause that. I had to diagnose that on the yfm350er videos I did. In the end it was a bad cdi for me.
@@VermontLife it’s pushes air out of the carb when it roals over is that normal?
No, should be on the intake stroke. Make sure the intake and exhaust valves are opening and closing properly. Might just need to have the valves adjusted at that point. If they are way out of spec it will have low compression and not start.
I have put a new stator on my 125cc , getting gas but still no start
Do you have a good spark and compression. Start with those three things, gas, spark and compression. If you have all those and still nothing then I'd check timing and CDI but gas, spark and compression first.
What size chain was that?
The Tao Tao's that I have worked on have 420 size chain. I'm not sure how many links. 82 or so... Typically you can buy a 420 chain with 130 links or so with a chain breaker tool on Amazon for $20 or so. I'd go that route.
I've got a 2020 Tao Tao 110 bike it was running fine for a while and now when I go to kick it over the motor spins but wont start, doesnt even sputter a little bit, I know it's not seized cause it turns by hand, when I tightened the clutch to a certain point it would sputter on 1 kick but then not do it again, I'm just lost
Have you confirmed you have spark? I would pull the plug out, keep it attached to the coil and ground it to the chassis. You should be able to kick it and see blue spark. It might be helpful to have someone else kick it over while you watch. If you have spark then put a little starter fluid down the spark plug hole and try to start it again, if it starts then dies you likely have a fuel issue. If that’s the case you may need a carb cleaning. There could be a number of things but confirming spark is a good first step.
@@VermontLife I guess maybe the spark plug I just put in was bad, put another new one in and it fires right up, I guess it never hurts to check twice, thank you
Wow, that’s awesome that it was a simple fix. Have fun.
Mine evidently got some water through the carb while sitting up. Turns out the valves are steel but not stainless so they pit out. Replaced valves, back in business.
My son's apollo 125cc sport Trax lost nearly all power. It'll still crank just fine and quick, but once in gear, you have to give it full throttle to get moving. PLEASE HELP!
Sounds like carb issues. Does it start and idle? What happens as you slowly give it throttle? (Ie spit and sputter, backfire, just bog out and die.) How it responds will help determine what the issue is and if the carb is the issue at all. option two… the clutch is worn out and not engaging until high rpm. I could see that being a scenario as well.
@@VermontLife yes sir, it cranks perfectly, idles perfect imo, no backfire, sputter or anything really. Just doesn't want to go until very high throttle. Also THANK YOU FOR TAKING THE TIME TO RESPOND!
Also doesn't bog down and die.
@@oilfieldman1209 My best guess would be the clutch then. Internally they have a centrifugal clutch which can be burned out. It is replaceable. I took a quick look on YT and this fella looks to be doing a clutch swap due to your same symptoms czcams.com/video/3jDa4gJz8EE/video.html
@@VermontLife wow, I'll get that out and replace! Man I really appreciate the help brother. Son loves that thing!
DUDE, WHAT?
Yup, I’ll never live that one down :).
Time stamp for fix anyone?
Thanks.
Can't say this was really a 'fix' other than the realization that I had no compression due to a washer stuck in a valve. The fix was to put a new head on from Amazon. (Cylinder was fine, just needed a head.) Once I had that it took all of 20min to be riding again.
@@VermontLife I guess you're talking
about a washer that's part of the valve
assembly. Great that you got it back
running. 👍
Worse, I had dropped a copper crush washer in the there before I put the head bolts on. Live and learn sometimes.
@@VermontLife I've done plenty
of things just like that. 🤐
Can I have your email please my issue is I have a ck125 like cg style engine but I can’t get fuel to the bore not a novice but stumped mate
lol in a white shirt to boot
Good video on what NOT to do to an engine.
Spark and fuel, no start?
Compression test....or atleast put a finger over the spark plug hole while cranking.
You seem a little clueless....must be an east coast thing....lol.