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Discussion Starter · #1 ·
I´m working on a Yamaha XV 535 Virago for a guy i know - kind of early winter project.



It seems the stator is bad, but I want your opinion about it, as I´ve never had exactly the same problem / symptoms on any of the Cx-es I´ve been working on. All stators I´ve replaced had ignition source coil damages, either the low or the high speed coil.



This Virago stator has only three cables from it - one for each phase of the chargin system. Nothing more.



With my multimeter they seem to measure fine (OHM:s) between each other and also each one against ground (earth). But when I start the engine and let it spin at intermediate revs (no tacho) I get around 60 V AC against ground on one coil, but significant lower figures from any of the other two (~20-30 V AC).



The problem with the bike is that it doesn´t charge the battery as it should - I can never see more than somewhat over 12 V DC between battery terminals (battery fully loaded), when I let the engine spin rather fast.



Do you think that my findings (measurement values) are the entire reason? I don´t want to buy a new stator if not needed.



Grateful for any ideas.



Sture
 

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Sture the Viagra 535 stator is very simllar to the

ones used on the TI bikes.

I tested one for a pal of mine.

I'd start with resistance tests and expect to see very low

resistance between any pair

(No more than about 1 ohm more than shorted probes)

and very high resistance to ground on all of the three wires

( megaohms)



Anything not very low or very high is suspect



AS for voltage:

with the stator plug disconnected and the motor running at a steady speed, you should get very similar AC voltages between each phase to ground



HTH
 

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You should get infinite resistance from any one of the yellow wires to ground, they are insulated. You should get similar resistance between any combination of yellow wire to yellow wire. You should measure voltages from yoellow wire to yellow wire (not to gorund) with the engine running and the wires disconnected from the regulator. You shoudl get similar voltage between any combination of yellow wire to yellow wire. Make sure you have a good battery and that it is fully charged. A bad batery can shunt more current through it than a bike alternator can put out and result in a low voltage reading like you're seeing.
 

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Agreed. Even with a good stator, stator voltage readings measured with respect to ground are a function of trivial leakage paths (possibly stray capacitance) and generally don't provide useful information.



Make certain that you are using the highest range possible on the meter when measuring the resistance between the stator windings and ground. The reading should be infinite - even a high resistance is a problem.



The troubleshooting techniques for our bikes should also apply to this one. More info here.
 

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Discussion Starter · #5 ·
Thanks, guys!



Now off to the (remote) club garage where I´m doing all of my wrenching / spannering! I´ll do it all over, once again, but am already pretty sure the stator is toast. Luckily they aren´t overly expensive (aftermarket items).



Needless to say the Virago isn´t exactly a favourite of mine! I´d rather be wrenching on my CX-es.



Sture



Update: I got resistance readings, measuring each cable against ground, clearly indicating that there is connection there (not open circuit). That seems to settle it.



Thanks again
 
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