UPDATED HD VERSION. WITH CONDENSED STEPS FOR MORE ADVANCED MECHANICS
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*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)
2:42 Checking for Spark. Make sure ground spark plug, key on, kill switch off. For instructions on how to remove spark plug see video-- [ Ссылка ] You can use tool kit provided with tao tao, use screwdriver inserted through end of socket to remove spark plug. Do not overtighted upon reinstall (use anti-seize).
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
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5:48 Final Thoughts & Outro
Supplemental Videos:
Here is how to adjust your valves--
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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)--
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adjusting and setting the idle--
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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.
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If you have no spark and want more diagnosis steps for the ignition system--
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To clean the carb (if a kid can do it so can you) Many other videos on this and all the same principles apply--
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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--
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More about fuel regulator / how it works--
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Also what can go wrong with fuel regulator where it lets gas back in through the vacuum line-- flooding the engine and causing it to die at idle-- [ Ссылка ]
The carb I bought--
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Spark plug NGK C7HSA
Inline fuel filter i used--
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