1970 CT90 Stator Help

a1parrothead

New Member
Hello,

I was beginning to track down an electrical problem (it appears stator is going to ground) on my 1970 CT90.
When I took off the stator cover, it was FLOODED with oil. Not a few drops, but TONS.
Is this normal? I have read that it is "wet" on these bikes, but should it be submerged in oil?

I put my ohms meter on the yellow wire and then to ground and it showed continuity. Then I checked the pink wire. It also went to ground. I think stator is fried, but what about all that oil?
Any and all help would be great! Thanks in advance.
a1parrothead
 

b52bombardier1

Well-Known Member
Hello,

Oil at the stator? I would not worry about it as long as the case and shifter seals are good.
CT90_Stator-Continuity-Test.jpg

Check for continuity per the attachment. Yes, sounds like a coil might be grounded and fried is probably a good word for it. My guess is that somehow, this bike got started with a battery and then ran for a considerable amount of time WITHOUT the stator having a good connection to the battery. Though the Honda CT90 and ST90 stators only ever created 62 watts of power at about 5000 RPM the day they left the factory, that power has to go somewhere.

Be it to heat, to recharge the battery or run the lighting, something went amiss. Do any of the individual stator coils look dark or cooked? I wish Jon Pardue still hung out here because he has ran 90 CC stator experiments on a bench test rig and could tell us precisely what might be wrong.

If it turns out you need a 90 CC stator, I have one though you might need to switch connector styles. It has a vanishingly low price, if you need it.

Rick
 

a1parrothead

New Member
Thank you.
The pink and yellow wire are going to ground when I check continuity to the frame.

Also, the stator are did not have a little oil. It was FLOODED with oil.
Any thoughts?
 

b52bombardier1

Well-Known Member
Most of my 90 CC engines here have some oil on that side of the engine and I'm unconcerned about it. My case seals / gaskets and shifter shaft seals hold it all inside, no problem. As Yoda might say if he were a Honda small engine mechanic, "Flooded stator, it can't be!!". The oil level in the center case, if filled properly, simply prohibits what I believe you are indicating here.

Which begs the central question. What was or is the oil level on the dipstick?

Rick
 

a1parrothead

New Member
Rick,
It dumped almost a quart of oil from the stator area. Then, I pulled the oil drain plug and it dumped a MEASURED quart into a pan.

So, obviously overfilled. I am hoping now I can add the proper .95 quart, and not have that problem.

And then, solve the Stator going to ground problem. Any thoughts on an easy way to remove stator?
Jeff
 

b52bombardier1

Well-Known Member
I'm not sure that would matter unless that lamination chopped a coil wire during the act of being bent. Hard to tell from this angle. Your rectangular-connector, replacement stator checks good for continuity per the shop manual and has no leakage to ground. It should arrive at your place next Monday from Louisiana in a flat rate USPS shipping box. The tracking number is in our PM conversation.

The good doctor at Dr ATV used to have conversion connector parts to upgrade the wire harness to rectangular connectors but it is not listed on his site anymore as far as I can tell.

Rick
 
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