cros36
New Member
74 tx650
Posts: 44
|
Post by cros36 on Mar 17, 2010 4:00:52 GMT -5
looks like there hasnt been much going on in this thread. i thought i would open it back up and make a mess of things. ;D i have read through the 4 pages on this rectifier thread and all 10 on the regulator thread just to make sure this wasnt a repeat question. gonna collect all the necessities to do these mods tomorrow. and was wondering on mounting. how enclosed can these two mods be. making a bobber  and was wondering if they could be mounted in a fake oil tank. or is it going to burn up? crosby |
|
|
|
Post by pamcopete on Mar 17, 2010 5:36:30 GMT -5
cros36,
Well, I think that the lack of activity here could be because everybody has done the mod!
You can put the regulator in a can, but the rectifier needs to be hanging in the breeze because it does get hot.
Now, if you really want to get creative, you could put some louvers on one end of the "tank" and a cooling fan on the other to suck some cool air through the tank and mount the rectifier in the tank. Just a little 12V computer fan from Radio Shack would work.
|
|
|
|
Post by bradypunch on Jul 4, 2010 9:41:11 GMT -5
I ran across this topic while researching for my buddy's 650 that we are building and I want to know if you guys know if this will work on my bike. I have a 79' xs750, and my regulator/rectifier is toast. I know im on the 650 garage forum but you guys seem to know what you are talking about. Any advice would be much appreciated. Thank you
Brady
|
|
|
|
Post by pamcopete on Jul 4, 2010 10:04:46 GMT -5
brady.....,
If you or someone else here could post a wiring diagram for the XS750 I'll take a look. Right off hand I would say that it will work, along with one of the regulator replacements because Yamaha used a lot of parts in common on the various models.
Alternatively, you could go to the Yamaha web site, or some other source, and see if the part number for the 750 is the same as the 650.
Also, is the setup on the '79 XS750 a combo reg/rect or are they separate, as they are on a '79 XS650.
|
|
|
|
Post by bradypunch on Jul 5, 2010 7:22:48 GMT -5
I will get a copy of wiring diagram posted soon. I think that its a combo unit but I could be wrong. This is a new adventure for me and I'm not too familiar with these bikes yet. I'll do some checking and get back with you. Thank you for your time
Brady
|
|
|
|
Post by dillrepair on Sept 2, 2010 21:52:47 GMT -5
GREAT THREAD... Bought the parts for this today along with part #vrc38 from napa... www.napaonline.com/Search/Detail.aspx?R=ECHVRC38_0060500216 ... which is the nice weather-resistant rubber connector for the regulator. It may also come up as a fog light connector... same part and number either way. So hopefully i can extend the life of my apparently fully functional charging system. Cheers. |
|
|
|
Post by dillrepair on Sept 4, 2010 0:29:26 GMT -5
kind of a funky technical question... maybe something pamcopete will know... i opened up the rectifiers today and even though the bags for both have the same part number on them one is a gbpc25005 and the other is a thicker gbpc3504... voltage numbers on the datasheet for both are similar but in the temp and forward voltage graphs there is a difference.... it appears the 35 is better than the 25 to my untrained eye? does it matter if i use the two together? i can just go buy another one from radio shack... should i bother?
|
|
|
|
Post by pamcopete on Sept 4, 2010 5:02:08 GMT -5
Dill....,
You can use those two together unless you want them to look the same, but it doesn't matter.
|
|
|
|
Post by xsleo on Sept 4, 2010 23:23:58 GMT -5
On bradypunches 750 does it have brushes? I think if it has brushes the reg/rec mods should work.
|
|
cmyoch
New Member
1978 XS650 Special
Posts: 24
|
Post by cmyoch on Sept 28, 2010 23:37:39 GMT -5
Hey guys,
I just finished fabricating my rectifier. I stopped by the local computer repair shop to ask if they had any scrap alum laying around and the guy graciously handed me several heat sinks of various sizes and all of them were finned. This one will fit under the battery box in the stock location.
My question is this. I see that the original rectifier was grounded through the wire harness. By now grounding the new rectifier to the frame, can I tie off and eliminate the original ground wire? This wire as well as the rectifier were fried when i got the bike a few weeks ago. The guy at the parts counter told me most likely the PO tried to jump start the bike from a car which caused the ground to burn up. He then drained the tank and carbs and parked it for 2 years. I'll have the rectifier installed tomorrow and plan on pouring in some fresh gas to see if she'll start. Keep your fingers crossed!
Craig
|
|
|
|
Post by pamcopete on Sept 29, 2010 5:20:58 GMT -5
cmyoch,
That depends on where you mounted the rectifier. If you mounted it under the battery box (original position) then the answer is no because the battery box is not grounded. It floats on its rubber mounts. You could, of course, run a separate wire to ground the battery box, but that's more trouble than just grounding to the original black wire in the harness.
|
|
cmyoch
New Member
1978 XS650 Special
Posts: 24
|
Post by cmyoch on Sept 29, 2010 9:53:33 GMT -5
I mounted the rectifier in the stock location under the battery box with a ground wire bolted to the frame. The ground wire in the harness was fried all the way to a joint of other ground wires under the top of the frame which makes it difficult for me to get a replacement wire soldered in. I figured I could ground the rectifier to the frame and eliminate the ground in the harness that was burnt up. Do you see any issue with that?
I'm a total newbie in the motorcycle world. I bought a 78 Special pretty cheap to fix up and learn to ride. I plan on fixing the wiring, put in new fuel lines and filters, fill her up with gas, and see what happens.
Craig
|
|
|
|
Post by pamcopete on Sept 29, 2010 12:54:12 GMT -5
I mounted the rectifier in the stock location under the battery box with a ground wire bolted to the frame. The ground wire in the harness was fried all the way to a joint of other ground wires under the top of the frame which makes it difficult for me to get a replacement wire soldered in. I figured I could ground the rectifier to the frame and eliminate the ground in the harness that was burnt up. Do you see any issue with that? Craig No problem. |
|
|
|
Post by pamcopete on Dec 12, 2010 18:00:05 GMT -5
You can also do this mod with just one three phase rectifier for a little more money. There are three phase bridge rectifiers available, they are just a little more expensive. Here is one from www.newark.com for $12.91  Newarks part number 07B3993 Also not as convenient to replace on a weekend, and no spare set of diodes. |
|
|
|
Post by dogbunny on Dec 13, 2010 9:38:26 GMT -5
pamcopete, thanks for an excellent find. I would much rather pay a few extra bucks for the single 3-phase rectifier because it can be hidden in a smaller space compared to the Radio Shack rectifier. It will also look cleaner and simpler and will be easier to fabricate with the elimination of a couple of jumper wires.
|
|
and was wondering if they could be mounted in a fake oil tank. or is it going to burn up?
