Taotao 125 starting issue

Keystone478 · 09-10-2022, 06:11 PM

I got a 2017 tao tao 125 and it won't start. I put a new carb on, New plug, fresh gas and it will crank, try to start, pop and some. Smoke will. Come out of the muffler and that it.. Any ideas what I can try?

**JerryHawk250** · 09-10-2022, 07:16 PM

Valves more than likely need adjustment. Valves are probably not fully seating so you're loosing compression.

Keystone478 · 09-10-2022, 09:14 PM

Thank you. Can you provide any guidance on how to do thie adjustments?

dirtbkr188 · 09-11-2022, 10:01 AM

Click and use .003" for the intake and .004" for the exhaust.

Keystone478 · 09-21-2022, 09:03 PM

Adjusted the valves and have zero compression. Do you you think replacing the head and all gaskets will help? Also, do I need to pull the entire motor to just replace the head and gaskets?

TominMO · 09-22-2022, 07:35 AM

Quote:

Originally Posted by Keystone478

Adjusted the valves and have zero compression. Do you you think replacing the head and all gaskets will help? Also, do I need to pull the entire motor to just replace the head and gaskets?

Since you are new to all this, I have to ask if you are sure you adjusted the valves on the proper TDC, i.e. the compression stroke. If you adjusted them on the exhaust stroke, I could see that giving you a zero compression issue. Never heard of compression actually being zero before. Low, like 50 PSI, yes, but not zero.

If you do have to pull the head and cylinder, that should be doable with motor in the bike. This guy makes some nice videos, like these:

Cylinder head rebuild

Complete Taotao 110cc motor rebuild

If you pull the motor, here is a simple and cheap engine stand you can make:

Bruces · 09-22-2022, 12:12 AM

Without seeing what you have ,nobody can answer that .Pull the top end and see what you are working with ,and be aware that if the top end has been melted down ,the bottom end and transmission are possibly not too far behind because they share the same oil and the metal shavings would travel throughout .But before that ,make sure you adjusted the valves correctly on the correct stroke etc. ,you wouldn’t be the first to mess that up

09-10-2022, 06:11 PM	#1
Keystone478 Join Date: Aug 2022 Posts: 11	Taotao 125 starting issue I got a 2017 tao tao 125 and it won't start. I put a new carb on, New plug, fresh gas and it will crank, try to start, pop and some. Smoke will. Come out of the muffler and that it.. Any ideas what I can try?
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09-10-2022, 07:16 PM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,713	Valves more than likely need adjustment. Valves are probably not fully seating so you're loosing compression. __________________ 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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09-10-2022, 09:14 PM	#3
Keystone478 Join Date: Aug 2022 Posts: 11	Thank you. Can you provide any guidance on how to do thie adjustments?
	0

09-11-2022, 10:01 AM	#4
dirtbkr188 Join Date: Aug 2009 Posts: 572	Click and use .003" for the intake and .004" for the exhaust.
	1

09-21-2022, 09:03 PM	#5
Keystone478 Join Date: Aug 2022 Posts: 11	Adjusted the valves and have zero compression. Do you you think replacing the head and all gaskets will help? Also, do I need to pull the entire motor to just replace the head and gaskets?
	0

09-22-2022, 12:12 AM	#7
Bruces Join Date: May 2018 Posts: 1,649	Without seeing what you have ,nobody can answer that .Pull the top end and see what you are working with ,and be aware that if the top end has been melted down ,the bottom end and transmission are possibly not too far behind because they share the same oil and the metal shavings would travel throughout .But before that ,make sure you adjusted the valves correctly on the correct stroke etc. ,you wouldn’t be the first to mess that up
	0