Yamaha 4-Wheeler

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Old 08-05-12, 06:32 PM
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Yamaha 4-Wheeler

Is there any way to test a rectifier regulator to know if it is faulty
 
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Old 08-05-12, 06:49 PM
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yahama 250 4 wheeler

engine quit running, no fire at plug. bought new cci?module, still no fire, traced all wireing for short and conduitinty, all good.coil is good. all is left is the rectifier- regulator. it was put on new last year. is there any way to test it. or do i have another problem?
 
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Old 09-02-12, 03:41 PM
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I just when through a major what if drill with my '94 Kodiak.

I suggest you buy a Service Manual for your model.

Here's a forum post that may get you started.

2002 Kodiak Regulator/Rectifier Bad? - ATV Forum - All Terrain Vehicle discussion for Honda, Yamaha and more ATVs
 
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Old 09-02-12, 03:46 PM
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More than likely it's the Stator.

This is a test to see if the stator is good. You need 3 things. A battery(already in your bike), a headlight, (your bikes headlight is ok but a loose headlight is easier to work with) and 3 test leads.
1- test lead has to have two alligator clamps, the other two test leads will have a clamp at one end and a pointy end at the other.
• Now take one lead with the two clamps and hook it to either battery terminal and the other end to either headlight terminal.
• Hook one of the two remaining leads from the remaining battery terminal and the other end to any of the 3 white stator wires in the stator connector just under the gas tank on the left side of the bike usually.
•Take the remaining lead and hook one end into either of the two remaining white stator leads in the connector and connect the other end of the test lead to the remaining headlight terminal.

Now you are running at least 5 amps thru the stators windings. The stator has 3 windings. They are all connected together at one end internally and the 3 white wires you see are the other end of each winding. Imagine a letter "Y". Each leg is a winding.
Now the headlight should shine brightly. Electricity is flowing the the 1st 2 winding you connected to. From a leg thru the center of the "Y" and out other leg and thru the headlight and back to the battery completing a circuit.

• Move one of the leads at the stator to the remaining unused stator lead. Should have the same result. A headlight that lights. Now here is a test the shop could easily miss.
• Take one of the test leads from the stator connector and remove it from the connector and touch it to ground. If the light lights you have found a short in the stator. The stator windings are supposed to be completely isolated from the engine metal. Just connected to each other.
• Leave the test lead end on the engine ground and plug the other end (still in a stator lead connector terminal) into the other two remaining stator terminals checking all three wires for a short.

• The reason or concept behind all of this is.........a multimeter and Yamaha's test meter do not push enough amperage through the stators windings to see if there is arcing of electricity thru the clear resin like insulation (or cracks there in) and onto the engines metal at a running amperage. Voltmeters usually only have double A's or a 9 volt battery (zilch amperage) and simply cannot test the stator for shorts under a real life load.

Typically the hard starting is very possibly the pulse coil. Now a rare thing is to have a bad flywheel. The magnets can go bad. It is undetectable to you or I but they can lose just enough magnetism to weaken the stator coil output.
• The pulse coil has its own magnet and fires when a metal tab on the flywheel passes by it. U should also disconnect your kill switch.
It may be starting to short out enough at low load levels.
• Also as a last test, put a jumper across the ignition switch terminals that feeds the ignition system. Refer to a wiring diagram.
• A jumper wire across these terminals will bypass the switch in case it is reducing the voltage to the CDI. The stator and the pulse coil make voltage all on their own. Not from the battery whatsoever. The battery just turns the engine over therefore turning the flywheel over. The battery does send power to the CDI though to make it work.
 
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