XH Motorcycles Forum
Motorcycle Resource Forums => Technical Resource Discussion => Topic started by: 2CoolWheels on September 04, 2012, 02:18:29 PM
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From talking to other Xer's, and especially Bruce, I found that some of the parts on our bikes were also used on certain Japanese bikes. So, it occurred to me that perhaps the stator was as well, since I can see the word "Japan" marked on the rotor. I took some measurements and bugged a lot of eBay folks asking for dimensions of the used stators they had up for auction. I ended up purchasing a stator for a 1990 Yamaha FZR600 for around $40. It has identical OD and ID dimensions to our unit, but is slightly thinner (EH are around 34mm, the Yamaha is about 30mm). When mounted, however, it is still centered in the rotor.
And it works.
I thought since I had 741 apart, now was the time to test my theory. I had to purchase slightly shorter screws to mount the stator with. I had to remove one of the cable retaining brackets from the Yamaha stator, and remove a tiny bit from one of the ribs in the primary cover to mount it. I also had to cut off the crank sensor from the stator harness, and trim the rubber grommet so it would fit our primary (and used silicone as well). I removed the existing 3-pin connector from the stator harness and installed three female spade connectors which could easily connect to the stock regulator (there won't be any weather protection, however).
I ran the bike for a few minutes and it put out a nice solid 13.47 volts. The real test, of course, will be how well it holds up over time. I will run this stator, I've still got the original if it fails. If for some reason the output is too much for the regulator, I've got spares of those as well. I'll keep everyone informed, this may be a good inexpensive alternative to the original EH part. There's lots of Yamaha 600's out there being parted out!
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Good sleuthing, Mike! I just replaced the stator in the Jennie so I can appreciate the desire to find a less costly solution.
You shouldn't have any problems with the voltage regulator. As I'm sure you already know, most motorcycles are in the 300-400 watt range so if it had the same approximate external dimensions, it probably makes close to the same output.
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really wanna see how this turns out...
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Greg,
Yes, the windings should be similar. The resistance phase-to-phase was the same, about .7 ohms, so I wasn't too worried about excessive current.
I'm also watching another Yamaha stator on eBay that has what appears to be identical dimensions. If I can get it for the right price, it may be an even better answer.
Bruce,
I will definately keep everyone posted on my little experiment. So far the only problem has been oil seeping around the grommet. I added some silicon last night to try and stop it, I'll find out today if it still leaks.
It's still charging though.
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We went through this process 8-9 years ago and bought some of the stators. Unfortunately, they are not rated for the same RPM range as ours and will burn out in 6 months or so depending on how often you ride. Had a couple of folks test them for us as well as here in the shop. Just saying.
Marty
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thanx Marty, for the info....
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Thanks Marty,
I'm glad some of this research has been done. The Yamaha stator has been holding up fine, but only has about 200 miles on it. I admit I'm afraid to take a long ride with it, so when I install the parts you shipped me, I'll be putting my EH stator back in. (Besides, the silicone all over the primary cover looks like crap!) :P
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Well, Marty is correct, and timing is good. I received some parts from Atlantic EH and needed to go back into my primary to install them. A day before I planned to do so, my surrogate stator failed. Perfect. I installed the oil pick up tube kit, the Viton clutch seals, and the original stator. 741 is as good as new... no... better than new! Thanks Marty and Jamie.
I guess the bottom line is that some Yamaha stators will work as a stop-gap or more temporary fix. A permanent fix will have to be an EH specific stator. Hopefully there will be enough available to keep our bikes on the road for a while. I know John Jones has some as well as Russ at Thunder-X: http://www.thunderxperformance.com/store/ for about the same price.