WCNI1508-2 It’s a mysterious washer that’s even sold at Yodobashi for some reason?? Rest assured, it’s properly made.
The thickness is 2mm and it’s a machined product, so the precision is pretty good. It’s great to be able to get a thick washer with a small outer diameter relative to the inner diameter as a single item.
You can use it nicely with a lock nut as a set like this. Back in those days, the component configuration wasnut & washer & spring washer. With so many parts involved, removing the spring washer and using a lock nut is cleaner looking and more reliable. I don’t really trust spring washers. Honestly, they’re not used at all on modern motorcycles either.
Regarding spring washers, their anti-loosening effectiveness is now questioned, and more effective anti-loosening nuts and wedge lock washers are increasingly recommended.
Why spring washer effectiveness is questioned
Elastic force is far smaller than axial force When a bolt is tightened firmly, the axial force generated (the force trying to extend the bolt) is extremely large. The elastic force of a spring washer is negligible in comparison, and many studies have pointed out that it is often insufficient to prevent bolt loosening.
May actually promote loosening Some papers and experiments suggest that spring washers may reduce friction on the tightened surface, potentially making bolts more prone to loosening.
That’s what Gemini says (*´ω｀*)
Since the caliper is off, maintenance and checks
I even took the piston out. Since we did a caliper overhaul last time, there don’t seem to be any particular issues.
It has a bit of a strange contact pattern. Maybe the caliper is wobbling quite a bit.
With a single-piston caliper, many factors come into play, so constant attention is needed to keep it in good condition.
With the air bled and the front end completed like this. I’ll continue to check for oil seepage and such.
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