Best place to get new stator and gasket?

[Chuck78]

Ricks lists:

1977 GS750E stator p/n 20-309
1982 GS450T stator p/n 21-301

This would contradict what Caltric is saying! Bummer.

Funny how half of the Ricks' ebay listings show a photo of a 12 pole stator, but every listing is for 1980+

Unfortunately it seems the 77 - 79 stators are far less common, as the part number does not even come up in a Google search, there are none on eBay, & the Ricks website is the only source and specifies that these are rewound OEM units, & therefore there is a $50 core charge.

I hope the $50 core charge is already included in the whopping $195 price tag!!! Sheesh!
I think it's worth it to look into the Caltric 12vs18 pole info for even $145 for a Rick's 77-79!

[tom203]

The 12 pole stators are harder to come by new. Even used ones are pricey on ebay. I'm running on a used stator (second one) that I probably paid $10 for. If you are brave, look at this one to keep you running while you find a reasonable rewind shop...

http://cgi.ebay.com/ebaymotors/1977-79-Suzuki-GS750-GS850-Generator-Stator-Nippon-Denso-/251117310306?pt=Motorcycles_Parts_Accessories&hash=item3a77c21162

Looking at stator pics on ebay,lots of 77 -79's 550 and 750 seem to have wrong stator installed- unless the rotors were changed, which is doubtful.

[Chuck78]

Well for used, I luckily have the Rice Paddy here in Columbus, a huge indoor & outdoor Vintage Japanese motorcycle junkyard. I was looking for reliability, so I was hoping to find several good affordable new unit options.

I am following the thread on the 2011 Polaris atv Shindengen Series style regulator/rectifier, & am hoping that this provides a $70 option for an upgrade over the standard Shunt style r/r that causes the stators to run very hot. The series style are a very new design that momentarily shuts off the r/r to regulate instead of 99% of units (shunt style) that short out the stators intermittently to get rid of the excess voltage in the form of heat.

With a series r/r, a heavy duty stator is not needed as they run much much cooler & not at max load continuously. The other options are the compufire r/r or the ce-601 thru ce-606 intended for harleys, indians, & other 3 phase american v twins. Both are $160-200 for the r/r.

Of course any shunt style r/r that regulates all 3 phases as opposed to the suzukis that leave one phase unregulated will cause far less problems to your stator. Ultimately if this shindengen r/r is a true series unit & easily can be fitted to our bikes, say byebye to most of our electrical worries for very cheap $$!

[Chuck78]

I may likely just go to Rice Paddy (or ebay for cheapest $) & see about getting a 1980+ rotor with the correct number of magnets to work with a brand new Rick's unit if I have room in the budget. If not, then used it is for now!

I will have to check out her 77 GS550, as the used 1978 engine we put in it came with no stator& cover, & the Cycle Slavage place near Sandusky, OH provided another stator & cover to us. Could explain the 11.9 volts max output we are getting from her bike. I think the r/r has been a long problem w/po's judging from all the hacked&spliced wiring, missing fusebox, replaced r/r, no electrical parts mounted in stock location, etc...

[tom203]

When you get around to it, I'd be curious to know if either of your bikes already has been fitted with a 18 pole stator. I'm thinking that setup would supply some juice, just not enough to impress the R/R.

I bought some stuff at Rice Paddy- indoor and outdoor ? wow. good thing they aren't near me

[rustybronco]

To Chuck78; remember that both your bikes likely use a 12 pole stator,

And if it does I should have a 'good' 12 pole on the shelf at home.

[Chuck78]

Why did Suzuki change from 12 to 18 poles? Do more poles mean same current output with lower current load per pole and therefor lower temperature & better reliability? Or do more poles generate higher total output? For all I know maybe it provides a smoother electrical wave form to have more poles.

[rustybronco]

Well, for one thing it will output more sine waves per a given amount of crankshaft revolutions. I 'assume' that equates to more current output per revolution until the coil reaches saturation.

It's been a long time and I wish I knew the answer without having to look it up.

[tom203]

Well, for one thing it will output more sine waves per a given amount of crankshaft revolutions. I 'assume' that equates to more current output per revolution until the coil reaches saturation.

It's been a long time and I wish I knew the answer without having to look it up.

I like how you think! yes, more poles means a higher voltage at same rpm, so you get might get enough to keep battery happy at idle. At 1200 rpm, my charging system makes 12.8 volts, just enough to supply running bike loads. I suspect the stator is saturated at 5 k rpm- i.e., no more output, just heat!