FJRPittsburgh wrote: ↑Sun Apr 25, 2021 3:59 pm
... It was some long tech day for Trevor and I yesterday. All that work and no real improvement. At least we've crossed another possible cause off of the list. The bike can be ridden in any event...
I would put this service in the category of "Preventative" Maintenance. This thread is the result of a SH__37 event, which blocked the clutch working altogether - in gear - at freeway speeds.
If you never experience this event, mission accomplished!!!
The bright side is that you and Trevor shared an evening together working on a project; that time spent is precious, and to be treasured.
As for the bike, you did no harm. In fact, you serviced the swing arm, cleaned things up, and rebuilt the clutch actuator motor, which I would imagine was quite dirty inside and in need of service. You probably noted other things, which will need attending to eventually. Your bike will benefit with a service of the clutch hydraulic system, like mine. And just so you know, I was able to finagle that clutch master cylinder out without dropping the swing arm; it can be done, but you might find it easier to just drop the swing arm again, knowing whats involved.
Full disclosure here:
It took several months, but even with a clutch fluid bleed my bike occasionally has that delayed shift from 2nd to 1st. Frustrating as all get out, considering the work done so far. I'm beginning to think that the actual sensors on the pivot shafts for these two actuators may be the guilty items for the delayed shift. The sensor housing being the big black thing with the wire connector attached.
I haven't opened one up yet, however, I suspect it is a wiper on a circuit board carbon path.
The MCU (Motor Control Unit) senses a variable electrical voltage signal from these devices, much like the fuel gage sender. Full gas tank and the wiper is at one end of the carbon path. As the gas tank empties, the wiper swipes across to a different position in that carbon path, resulting in a change in the voltage and different reading on the instrument cluster. I have noticed, on my 108,000 mile bike a lower average MPG readout in comparison to my record keeping from years back, yet when I do the math work, my mileage has been consistent. I log every gas stop, and this degradation is small but noticeable.
The fuel sender lives in a bath of gasoline, however, both clutch and shift actuators are in a dry environment behind gaskets and o-rings. It is quite possible that these need a good cleaning to restore like new performance. When I get a chance, I plan to open one of these up from my e-bay purchased spares to see if my suspicions are any where close to reality. I do know that these are tuned from the factory, and the lock screws are painted secure. I will scratch match marks before breaking that seal.
We shall see.
In the mean time, keep at it Jeff, we'll track this thing down yet.