Go Back   ATVConnection.com ATV Enthusiast Community » Brand Discussions Area » Chinese Quads » 1) Engine problems..
Sign in using an external account
Register Forgot Password?
Search

Welcome to ATVConnection Forums!
Welcome to ATVConnection.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the ATVConnection Forums community today!


Reply
  #1  
Old 10-31-2011, 04:56 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Oct 2011
Posts: 6
Default sunl sla90 no spark

My name is Matt and I do most mechanical work myself on all vehicles and atvs when I have the time. Electrical stuff kinda blows my mind though. I need help.

The engine cranks but I have no spark at plug

I did the tests that you suggested to securejohn and I didn't get any ac voltage at all no matter the situation. I did the kill switch test and it did not zero, is that correct? What is the difference in the stator and the magneto?
Reply With Quote
  #2  
Old 11-01-2011, 12:12 AM
Electrical Expert
Likes High Voltage In The Tub!
Garage is empty, add now
 
Join Date: Dec 2008
Location: Tracy, California, USA
Posts: 3,232
Default

Hi Matt,

It would really help if you not only did all the tests but reported the results as well. This is especially important when electrical stuff is not your forte. Many of the tests reinforce one another (if they're done right) and that is a good piece of info. If they don't reinforce each other then that's a red flag and we can dig in deeper.

For example, you say that you got no AC voltage at all anywhere. But equally important are the resistance measurements to ground on the same wires. You need both to make a good diagnosis. What brand meter were you using? What scale(s) were you on?

On the kill switch test you say "it did not zero". I need more detail. Were you measuring ohms? What scale? When you turn on a kill switch (to the kill position) does it change?

Magneto and Stator are often used interchangeably. One could argue that there is a difference based on points/condensor ignition versus CDI ignition, but so many people have muddled it up that argument has lost a lot of meaning.

Quote:
Originally Posted by sla90 View Post
My name is Matt and I do most mechanical work myself on all vehicles and atvs when I have the time. Electrical stuff kinda blows my mind though. I need help.

The engine cranks but I have no spark at plug

I did the tests that you suggested to securejohn and I didn't get any ac voltage at all no matter the situation. I did the kill switch test and it did not zero, is that correct? What is the difference in the stator and the magneto?
Reply With Quote
  #3  
Old 11-01-2011, 01:50 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Oct 2011
Posts: 6
Default

using a Cen-Teck digital multimeter- cheap but hopefully good enough.

Kill switch test Method 1 - no spark

Kill switch test Method 2 - run position - meter in 200k ohms setting - infinite

wiring connector test

ac power ignition pin to ground pin - meter 200k position - infinite

timing pin to ground pin - meter in 200 ohms setting - 124.6 ohms

ac ignition power pin to ground pin while cranking - meter 200 vac setting(lowest setting) - 0 volts

timing pin to ground pin while cranking - meter 200vac - 0.1 volts mostly showing 0.0 volts but would jump to 0.1 some


output side of CDI

Ignition coil pin to ground pin - infinite on all meter settings

CDI plugged in - meter in 200 vac setting - kill switches in run position - ignition coil pin to ground pin - 0 volts
Reply With Quote
  #4  
Old 11-04-2011, 12:08 AM
Electrical Expert
Likes High Voltage In The Tub!
Garage is empty, add now
 
Join Date: Dec 2008
Location: Tracy, California, USA
Posts: 3,232
Default

I have several of those Centech meters. They're crap mostly, but they do work (except when they don't), and its a cheap way to monitor several voltages simultaneously. I bought eight of them and still have 5 that work a year or two later. I have a good meter too for precise measuring, but I can't afford eight of those...

Your AC Ignition power wire power winding is open and produces no voltage. Note the wire color in the harness on that pin. Go down to the stator wires where they emerge from the engine side cover. Find the same color wire there on the wiring harness side. That will be the other end of the wire from the CDI connector.

Now look at the engine wires from the stator and note which wire hooks up to the AC Ignition Power wire in the harness. Unplug it and measure the resistance of that wire to engine ground (engine side wiring). If it is still open your stator is bad. If it isn't your AC Ignition Power wire from the stator to the CDI connector is open.


Quote:
Originally Posted by sla90 View Post
using a Cen-Teck digital multimeter- cheap but hopefully good enough.

Kill switch test Method 1 - no spark

Kill switch test Method 2 - run position - meter in 200k ohms setting - infinite

wiring connector test

ac power ignition pin to ground pin - meter 200k position - infinite

timing pin to ground pin - meter in 200 ohms setting - 124.6 ohms

ac ignition power pin to ground pin while cranking - meter 200 vac setting(lowest setting) - 0 volts

timing pin to ground pin while cranking - meter 200vac - 0.1 volts mostly showing 0.0 volts but would jump to 0.1 some


output side of CDI

Ignition coil pin to ground pin - infinite on all meter settings

CDI plugged in - meter in 200 vac setting - kill switches in run position - ignition coil pin to ground pin - 0 volts
Reply With Quote
  #5  
Old 11-06-2011, 08:10 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Oct 2011
Posts: 6
Default

Testing both wires, the wire from the stator to cdi and the wire going into the stator, they both show closed, they zero out on the 200k ohm setting.

With the meter on the 750 vac setting - negative terminal to engine ground and positive terminal to ac power wire - while cranking the engine - no voltage.

Should there be a dc power wire going to the stator?
I have the #3 stator magneto that is on the sunl website.

Stator Magneto 03 for Chinese 50-70-90-110cc Engines - Sm272-03 - 50cc - 125cc Stators - Stator Magnetos - Electrical Parts - In Stock at Sunlpartsonline
Reply With Quote
  #6  
Old 11-07-2011, 12:35 AM
Electrical Expert
Likes High Voltage In The Tub!
Garage is empty, add now
 
Join Date: Dec 2008
Location: Tracy, California, USA
Posts: 3,232
Default

My comments embedded in blue...

Quote:
Originally Posted by sla90 View Post
Testing both wires, the wire from the stator to cdi and the wire going into the stator, they both show closed, they zero out on the 200k ohm setting. [Huh? This is the complete opposite of what you said in your last post (you said the resistance to ground was infinite). Closed means shorted. So are you measuring the resistance of the ignition power wire to ground at the stator? (this is what I asked you to do ). Or are you doing something completely different? If you really are measuring zero ohms on the 200,000 ohm scale (200K ohm), then turn down the scale until you read something significant. Go to the 20K ohm, or the 2K ohm scale (or even the 200 ohm scale if necessary) until you get a reading that is other than zero. ]

With the meter on the 750 vac setting - negative terminal to engine ground and positive terminal to ac power wire - while cranking the engine - no voltage.

Should there be a dc power wire going to the stator? [Never - unless something is seriously wrong. The stator always *outputs* both voltage and current. It is never the other way on a working quad. And the output voltage and current is *always* AC - never DC. The energy being input to the stator of a working quad is mechanical. Any load on the electrical side gets transformed to a mechanical load on the engine since a loaded stator is harder to turn. ]
I have the #3 stator magneto that is on the sunl website.

Stator Magneto 03 for Chinese 50-70-90-110cc Engines - Sm272-03 - 50cc - 125cc Stators - Stator Magnetos - Electrical Parts - In Stock at Sunlpartsonline
Reply With Quote
  #7  
Old 11-07-2011, 06:44 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Oct 2011
Posts: 6
Default

Sorry I did all the tests again and it showed the same as the first time. I must have done something different? Sorry for the confusion. Thanks for all your help. I ordered a new Stator and i will let you know if it works

Thanks again for all your help!!!!! It is very much appreciated!!!!!
Reply With Quote
  #8  
Old 11-08-2011, 12:20 AM
Electrical Expert
Likes High Voltage In The Tub!
Garage is empty, add now
 
Join Date: Dec 2008
Location: Tracy, California, USA
Posts: 3,232
Default

Even seasoned techs get caught all the time by measurement error. It's part of the process - you check and re-check, move forward a bit and then re-check again....

Please do let us know if the stator fixes it...
Reply With Quote
  #9  
Old 11-18-2011, 11:13 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Oct 2011
Posts: 6
Default

The stator fixed the problem. Thanks for all the help!!!
Reply With Quote
  #10  
Old 11-19-2011, 12:12 AM
Electrical Expert
Likes High Voltage In The Tub!
Garage is empty, add now
 
Join Date: Dec 2008
Location: Tracy, California, USA
Posts: 3,232
Default

Awesome.
Reply With Quote
Old 11-19-2011, 12:12 AM
Reply

Tags
90, atv, check, chinese, diagnose, forum, ground, located, made, magneto, quad, spark, stator, sunl, wire



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On