Stator issue ( I believe )

markhodges78

Chief Petty Officer
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Aug 4, 2016
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Working on a 2001 90hp Yamaha Model 90TLRZ issue is it wont come on plane.
I have done some test on the stator and for starters I'm getting conflicting information.
A the manual calls for the low speed coil test Red and brown 60 dc volts and high speed coil test red and blue 100 dc volt ..

CDI Troubleshooting guide calls for low speed coil test Red and brown 100 dc volts and high speed coil test red and blue 60 dc volts. I spoke to cdi and they said the low speed coil always has a a higher voltage then the high speed coil. so that is the specs I'm going with.
with that said if I test the low speed coil test Red and brown using red to red test lead and brown to black test lead I get 26 volts but if I test brown to red test lead and red to black test lead i get 60.

No where does it state which leads to test with I would assume red to red and brown to black which gives me 26 volts connected. but if I do the same test unconnected 78 volts

Moving on to high speed side It calls testing red to blue for 60 volts and I'm getting 125 volts connected or disconnected using red to red test lead and blue to black test lead
But if I use red to black test lead and blue to red test lead I get 13 I am kind of confused at which lead gets used on which wire. Maybe since red is the common wire it is a ground ? so it should be tested black test lead to red wire..

This is all done with a DVA

If someone could help me make since of this i would appreciate it
 

markhodges78

Chief Petty Officer
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Aug 4, 2016
Messages
428
I aint no expert on these motors but are you sure the coil outputs are dc ?🙂
There not they are ac but you can't test peak voltage using ac you need to convert it to dc using a dva adapter or dva meter.. to remove read the peak voltage.
 

dingbat

Supreme Mariner
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Nov 20, 2001
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B
There not they are ac but you can't test peak voltage using ac you need to convert it to dc using a dva adapter or dva meter.. to remove read the peak voltage.
Black is universal color for ground unless it isn’t.

A schematic of the circuit will confirm either way.
 
Last edited:

boscoe99

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Aug 22, 2013
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2,219
Yamaha does not use any black (ground) wires in AC circuits. DC circuits only.

Is that a Yamaha manual diagram?
 

boscoe99

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Aug 22, 2013
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A DVA adapter is measuring peak AC voltage but yes the meter gets positioned on the DC setting. Confuses some folks.
 

markhodges78

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Aug 4, 2016
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428
A DVA adapter is measuring peak AC voltage but yes the meter gets positioned on the DC setting. Confuses some folks.
there are three wires for the stator Red Blue and Brown.. The black that I am speaking off is from the meter... which test lead goes where ? If I test red test lead to blue stator wire and black test lead to red stator wire the output I get is 13 dc volts. But if I switch it around and test black test lead to blue stator wire and red test lead to to red stator wire I get 60 dc volts
 

dingbat

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Nov 20, 2001
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17,009
If I test red test lead to blue stator wire and black test lead to red stator wire the output I get is 13 dc volts. But if I switch it around and test black test lead to blue stator wire and red test lead to to red stator wire I get 60 dc vol
Normally the color of the lead would simply reverse the polarity, -60V instead of +60 volts

In this case, polarity matters since your only rectifying half the wave cycle to test.
Keep black lead on red
 

boscoe99

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Aug 22, 2013
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2,219
Have you already tested the CDI box output and found that it is below specifications?

Follow this and see if it makes a difference.

 
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