Transmission Whine (Intermittent)

what is that first shot of? something is flexing there is that right?

I hear something not sure what tho, the stator bolts have been known to come loose check those right away don't start it anymore, check oil all that, make sure its full and clean, hi quality.. the pitch doesn't seem to get high with the rpms? wheel bearings so forth

TwistedMister said:

what is that first shot of? something is flexing there is that right?

I hear something not sure what tho, the stator bolts have been known to come loose check those right away don't start it anymore, check oil all that, make sure its full and clean, hi quality.. the pitch doesn't seem to get high with the rpms? wheel bearings so forth

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Ah! I did put a new stator on last year and it was quite cheap, I will take that cover off and see if anything is loose behind that cover. Thanks!!

No luck with the stator, everything looks good here, nice and tight.. Anyone else have suggestions?

On second thought, looks a bit rough See video lmk thanks!

Cam chain can be too tight and make noise like that. When I installed a manual cam chain tension adjuster on my Ninja, I was learning, and one thing I did was ride the bike around slowly in a parking lot with no helmet so I could hear the engine noises. And in fact yes, when the chain was set too tightly, I could absolutely hear a whine. If you haven't changed your CCT for an aftermarket manual one, you could try inspecting it and just re-setting the tension. It's rather simple and doesn't require taking the motor apart or anything. If you reset the CCT and it's still doing it, would probably be worth it to get a manual CCT and never have this issue ever again.

Worth looking at if the sound is still illusive. The stator wear there doesn't look good but isn't terrible. Make sure there's no debris stuck to the magnets in there, but even that wouldn't cause an "intermittent whining" sound.

Hope this helps.
-Mike

SparkyMJ said:

Worth looking at if the sound is still illusive. The stator wear there doesn't look good but isn't terrible.

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Well unless I'm mistaken and the magnets should be touching the steel (and AFAIK stators use magnetic fields, not mechanical friction to generate electricity)
then this is very terrible

There should be a couple dowel pins to align the stator holder/cover with the crankcase. Are they present? I don't know for sure but that doesn't look like an OEM stator. Is it? Is the rotor contacting the poles of the stator all the way around or just on the top? Have you dropped the bike in a way that might distort the cover?

Nightbat® said:

Well unless I'm mistaken and the magnets should be touching the steel (and AFAIK stators use magnetic fields, not mechanical friction to generate electricity)
then this is very terrible

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I mean yes obviously contact is bad, but usually it's just debris in there. If you said it was tight when you got in there, and you've reinstalled the stator, cover, and the dowels Bill mentioned, and it hasn't been dropped/crashed on the cover, and the wires weren't visibly rubbing on the rotor, then that's just about as much as you could have done there. Maybe sanity check that the rotor is tightened onto the crankshaft, but a lot of stuff would have to happen to make that loosen...

I guess a good way to tell here is run the motor, and try and determine which side of the motor is whining. Left or right. Right side would be where the cam chain is, left side is obviously where the stator is. Hope this helps.

-Mike

SparkyMJ said:

I mean yes obviously contact is bad, but usually it's just debris in there.

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There also should never be debris in there
But from the scuffmarks, either the stator is too large or misaligned

It's been a while but someone here had the screws that mount the stator to the cover start to come out and scribe grooves into the rotor. Use Loctite and make sure they're tight.