Stator volts low when hot. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 13 (permalink) Old 08-04-2010, 11:03 PM Thread Starter
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Stator volts low when hot.

This question may have been addressed many many times but I couldn't find a thread with it.

The stator is a rick's rebuild 6yrs old and the r/r (aftermarket and can't remember brand) is about 4yrs old. Only about 15k on the stator and less on r/r and degoated before new r/r. The battery 2yrs old is not an MF (wish I knew to get a MF before buying it) but is fully charged and tested good 12.5v+/-.

The stator test great when first starting the bike. 13.4v+/- at idle and goes to 14v+/- at 4k but after the bike is to temp or to the point of the fan coming on it tests at around 13v and bellow. I know the fan being on will decrease volts but didn't think that much. Just tell me if I am being too inquisitive. I will test my 01' tomorrow to see if I get the same results.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #2 of 13 (permalink) Old 08-05-2010, 01:13 AM
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My stator was defective right from the factory. It was odd in that it tested ok when cold, but failed when hot. I assume you're at a stop and the bike's idling when the fan comes on. It takes my bike a half minute or so of riding after the stop to recharge the battery and get the voltage back up. Does your voltage stay low, or is just low for a while after you're back up to speed?

'04 750A- and loving it!
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post #3 of 13 (permalink) Old 08-05-2010, 03:19 AM
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The stator may short to ground or a winding may be partially shorted only when the stator is hot. Do the resistance measurements when it is hot.
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post #4 of 13 (permalink) Old 08-05-2010, 09:18 AM
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I had a problem where my volts seemed to vary a lot. One nite at work I had to jump the bike off to start it. The next day I cleaned my battery connections and the ground connection, now the volts are a lot higher than they had ever been.

02 honda sabre 1100
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post #5 of 13 (permalink) Old 08-05-2010, 10:34 AM Thread Starter
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Quote:
Originally Posted by Ironman View Post
My stator was defective right from the factory. It was odd in that it tested ok when cold, but failed when hot. I assume you're at a stop and the bike's idling when the fan comes on. It takes my bike a half minute or so of riding after the stop to recharge the battery and get the voltage back up. Does your voltage stay low, or is just low for a while after you're back up to speed?
Yes I'm setting at idle when fan kicks on. It doesn't seem to be a big problem because the battery stays charged so I may be just over thinking it. Going to clean all the connections today and tackle more problems that have been overlooked far too long.

Which leads me to the next questions. Where can I get a carb rebuild kit fairly cheap. Not going to rejet them just rebuild. Also...Should I use brass feeler gauges to set the pick-up coils?

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #6 of 13 (permalink) Old 08-05-2010, 10:37 AM
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There are no kits. If you need parts you have to buy them individually.

02 honda sabre 1100
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post #7 of 13 (permalink) Old 08-05-2010, 10:39 AM Thread Starter
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How about a gasket kit for the carbs? Probably a dealer item if they still stock them?

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
baldy is offline  
post #8 of 13 (permalink) Old 08-05-2010, 12:04 PM Thread Starter
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Ok I got it figured out!

Tested the 01' (pro of having 2 identical bikes) and it tested the same as my 93'. As I see it when you 1st start the bike the battery has lost a little charge from sitting over night so the stator and r/r have to work to recharge the battery. When the battery hits full charge the stator and r/r don't have to work so hard to maintain it Hence why the voltage drops after warming up and when the fan kicks on and so does the charging system and the volts go up. Not rocket science but I feel smart now. lol

I did this test with a Shumacher battery charger that test battery charge/volts, voltage output, and alternator output.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
baldy is offline  
post #9 of 13 (permalink) Old 08-05-2010, 12:18 PM
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From my last thread about agm batteries i think we determined the stator works hard regardless of battery state. It just keeps putting out juice according to rpm. The R/R dumps the excess to ground, with that question of how much heat is generated in the R/R while shunting as opposed to flowing to a battery that needs it.
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post #10 of 13 (permalink) Old 08-05-2010, 01:08 PM Thread Starter
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Thanks for deflating my bubble dude. lol J/K I remember that convo.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
baldy is offline  
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