The Ultimate Tao Tao 50cc GY6 Troubleshooting Compilation (No Start, Bogging Out)

UPDATED HD VERSION. WITH CONDENSED STEPS FOR MORE ADVANCED MECHANICS

*Watch In HD* For Diagnosis of No Spark-- see below for links to diagnosis videos.

Quick and Easy Steps. Your chinese scooter won't start? Or does it die when you give it throttle? This is a condensed version of the process by which I figured out the problems with my friends scooter. Not saying yours will be the same, but these are good steps for anyone diagnosing scooters to run through. Also the information compiled on this page will keep you from scouring youtube and the forums for good information. One thing I did not mention is that I did do a valve adjust, but it didn't help me with my scooter (valves were near spec). However, I have read and I do believe stuck exhaust valves can be the problem for many people experiencing performance issues.

If you aren't getting spark (do not fear) look for links below about how to diagnose the issue. Most common problem would be CDI or Coil failing. Luckily on these scooters parts are very cheap, never a bad idea to have an extra part or two in the trunk compartment in case it decides to quit on you.

0:00 Introduction / Description Problem

0:20 Fresh Gas / How to Remove Seat and Battery Access

1:25 Checking for Gas at Carb / Fuel Regulator Explanation

1:55 Where Vacuum Line for Fuel Regulator Was Pinching on My Scooter

2:10 Checking for Flow of Gas through Fuel Regulator (Disconnect Line at Carb and Turn Engine Over)

3:23 Checking for Intake Leaks and Dirty Carb. Use Carb Clean not brakleen. Brakleen won't actually run scooter and may make it die, carb clean should act as a fuel where spraying it directly into the rear of the carb should allow the scooter to run. I don't care about people saying this is bad for the scooter or the carb, sorry but these are cheap chinese scooters-- get a life.

4:21 Where to Spray Carb Clean to check for intake leaks / dirty carb

4:36 Most Important Spot to Check for intake leak. Replacement part

5:48 Final Thoughts & Outro

Supplemental Videos:

Here is how to adjust your valves--

Good thing to do when starting scooter cold, pump the throttle before trying to start (if you have accelerator pump to push more fuel in the carb)--

adjusting and setting the idle--

how to unseal stock carb (must do before attempting to clean)-- good idea to order a new unsealed one and mess around and unseal old one. That way you have a replacement if anything ever goes wrong.

If you have no spark and want more diagnosis steps for the ignition system--

To clean the carb (if a kid can do it so can you) Many other videos on this and all the same principles apply--

If you have no fuel while applying vacuum at the fuel regulator either buy a new one (after making sure vacuum is adequate) or replace with manual petcock.

to replace fuel regulator with manual petcock and fix potential flooding of intake manifold with gasoline due to failed regulator check out this video--

More about fuel regulator / how it works--

The carb I bought--

Spark plug NGK C7HSA

Inline fuel filter i used--

[grazz]

Good video. One thing to note-empty a whole can of carb cleaner if you have to. Keep the factory carburetor if you can. The aftermarket carburetors are actually worse. I went through 3 of them. Eventually rebuilt the stock carburetor and put it back on. Runs great now.

[JayCras]

I want to add that two of us spent a day + trying last year to get this "thing from hell" going and I frankly just gave up.

Everything you pointed out was "wrong" The downhill hose wasn't, The carb needed to be blasted with cleaner and that input hose was so loose I thought I was turning a stripped screw to tighten it. I just did this stuff one thing after the other and it was ready and working in short order. You really made my day so thanks for doing what you do.

[mikemartinusa]

Great video! Will have to try these steps. Was having a no start problem which turned out to be a carburetor. Now the problem I have is that the scooter will run fine when it is first started and I can get up to 32 mph but as soon as I let the throttle back any it bogs down and can get 12 mph max. Let it cool down 30 mins and will work fine again for 2 minutes.

[howardcurtis]

Thank you you jogged my memory and fixed my 3 week long problem of a no start, , , do not overlook the intake leak from the head to the carb.

[wincar]

Dude, awesome video...thanks, been wrenching on my two Tao Tao 150's for hours, watched your vid and started both in 10 min.  Intake leaks, who knew...

[jessieyaz]

I watched 100 videos and yours is the best THANK YOU!!!

[FrenchieFries]

Ok I got mine to work got a new carb. My problem is I can get it to idle but when I add throttle it starts to die on me. So I can’t drive it. I don’t know exactly what it is but everything seems sealed. I was having a little trouble getting some gas pressure at first now I got it... hmmm this is like a puzzle tbh

[ProfessionalDad]

ADJUST THE VALVES. I replaced carb and CDI due to bogging out with no results. I finally checked the valves. The exhaust valve was too tight.

[brianlowks]

I decided to open up my speedometer case up to see how the miles tracker and speed cable make the orange needles turn but after reinstalling it on my scooter the needle for the speed no longer moves it is literally stuck and wont move unless I push it with little force and I'm thinking that it may just need some lube since I woke the thing apart or something, any thoughts on a fix ?

[missael]

Hi my Tao Tao racer 50 took a fall 2 days ago due to heavy wind, while parked out on the street. It starts up fine but once I come to a complete stop it shuts down. Any ideas of what I need to look into ? I'm using premium gasoline on a mid 2018 Tao racer 50.

[anthonydicicco]

ok, so first of all thank you for this video, definitely helps narrow down the issues. Now, i checked the fuel lines and im getting fuel to the carb, i checked the spark plug and im getting spark, i checked the connections for the intake at the manifold and at the airbox and made sure they were tight, still no start. i removed the intake boot and sprayed carb clean directly into the carb, still no start. im out of ideas. any suggestions? thanks in advance.

[chambliziOfficialChannel]

chinese gy6 vs genuine honda who owns both let me know

[donnamcconnell]

what if your seat won't lift out!
I removed all the bolts and it would not come out, all the screws and bolts mentioned were removed

[happygilmr]

yeah let's spray Carb or brake cleaner in the Carb and burn the valves

[someguystudios]

For me, the spark plug was loose. Put some never-seez on it cranked it hard, and it runs beautifully.

[thedaydreamer]

Good video, 3 things to get a engine to pop, spark, fuel and compression, , , I have bikes that good spark and fuel, but tested very low compression, rebuild top end or fix compression issue and you are good, , , test the spark first and foremost, its the you are supecting fuel, remove airbox and hit it with carb cleaner into the bike does not start, keep it simple and test those 3 things first, , , 99% of the time if you address all of those the bike will at least

Thanks to everyone who left me feedback! It takes a lot of energy to make these videos, but reading comments where it helped someone get their problem fixed makes it all worth it. Have a good day!

[JayCras]

Loose intake and dirty carb. Hosed it with carb cleaner and tightened the input and all I can add is YOUR THE MAN!

[DeadLetterOpener]

First thing you wanna do is spill a shite load of fuel everywhere...second thing you wanna do is make a shite load of healthy blue sparks around the general area you just spilt fuel. :D

Just kidding, had to laugh...great video mate.  Maybe just put a warning up for really really slow people, that they should wait a few minutes for the fuel to evaporate before doing the spark test...or just do the spark test first to be on the safe side.

[audratreat]

I have a 2020 49cc Vespa and know what my prob is now but forgot where all the hoses went, Diagrams dont help me much, can you show me?