sticky shifter

[shilka99]

Rather than post unrelated video in another thread I figured I'd post here.

I mounted a camera on the swingarm for the last session at COTA and after discussing shifting problems I thought I'd take a closer look at the video. Sure enough you can actually see it sticking while downshifting here:
(skip to 4:47)

It happens again at 6:09, but both are momentary, nothing like the time it stuck in second but its still interesting to see.
When it stuck i was using Repsol, this time I was using Motul - both 10w40 full synthetic. Time to test the Eni 5w40 synhtetic.

[fixxervi6]

I would guess it's the shift indexing forks (not sure what they are called) since it sounds like the bike does shift, the lever just doesn't return for another shift.

On a side note, some forum searching and most people appear to run 5W40

[fixxervi6]

To summarize: Pre - APRC models used 15W40, when APRC with TC a bunch of stuff changed, apparently there are some very tiny channels inside the engine now and there are startup oiling issues so they changed their spec to 5w40

[Rhino]

That was weird, could it be something like a return spring that isn't as strong as it needs to be?

[WillK675]

That is weird looking. I agree with them, looks like it's shifting, but not kicking back up.