I'm just too anal when it comes to racing. Especially if it was my bike and your ass. I'd be top fueling the oil pan every round just to check things out before I'd put my rider in harms way. That kind of anal.
Meanwhile, I'd sand off a tiny spot on one of the the clutch outer forks. I'd then take a scribe and drag a line on the pressure plate that sits at the end of that fork. With oil cap off, the fork with the nail polish comes around moving the engine around, and I pull the clutch lever, bring the pressure plate around with the scribe mark, line it up with the painted fork and watch how deep it goes from the scribe you made.
My point is, see how the pack shrunk from the fiber wear and that is more or less powder; if we had a dry clutch/brake pad dust ~ floating in the oil at one point. Then that gray mud forming on the pan is a combo of clutch powder and general wear. No matter how much of that cake is forming at the pan due to the plates losing the pack, I want it out of there.
Yes, it [the cake] stays packed eventually, but if the oil is coming out anyway, it's more you're also looking up at the rod caps and checking for bluing; and a hand rocking just to feel things out. Plus, my rub both hands together, which gray matter is added to the dust? That means all new frictions and steels. New against new, not new against used that still specs out? Not me.
I'm still impressed about the longevity of the OE parts you put on it. That's a fair field test, because I doubt you beat the bike having all that riding/racing experience. More or less, 'pleasantly worn out parts.'
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Ah, just popped in my head... Same paint, same scribe mark, but this mark is at its wear point. Now scribe the pressure plate. Once the new pack is in, where is the wear mark now? It's way out there away from the fork end, right? Now you watch that meet the fork and you know you're getting close to a new pack again. Yeah, you could move the pp over and scribe the full pack next to the worn scribe mark and watch both heading for the fork end... If I were drag racing my bike... no batteries needed.
Tormenting the motorcycling community one post at a time