Quite Ferocious? Actually Docile? ZX12R Head Cover Gasket Replacement, Shorai Battery, Highsider Turn Signals, and More

I’m going back and forth here and there.
Parts have been arriving in droves and I’m feeling a bit overwhelmed.

Now, I’d like to wrap up the ZX12R project soon.

ヘンリービギンズ(Henly Begins)
¥8,375 (2026/09/22 20:35時点 | Amazon調べ)

Let me check the calipers.

When you buy a used bike, you definitely want to remove the calipers first.
What kind of pads are installed? What’s the condition of the calipers?

Opening the throttle and accelerating is important, but stopping smoothly is even more critical.
By removing the calipers and observing the piston operation, you can get a good sense of the condition.

Condition appropriate for the year and mileage. To put it mildly, it’s something like this…
It’s the kind of condition where an overhaul or replacement wouldn’t be out of place.

The piston doesn’t return smoothly. It’s more like you have to strain to push it back.

The rear pad pins were dirty, so I replaced them.
The rear caliper Tokico has a double clip design, I see.
Let me compare the prices with Suzuki…

If Suzuki loses on this, that would be disappointing.

The brake pad thickness looks like it still has plenty of life.
If you lightly chamfer the part of the pad that contacts the caliper, it should move more smoothly.

I also replaced the brake fluid.
It was quite degraded.
The front master doesn’t have a check valve, so I installed a Honda OEM master with a float.

I also checked the headlight beam alignment.
The light output is solid and the high/low beam difference is equivalent to an H4 bulb, so it’s safe to use as is.

All that’s left is a test ride and we’re done.

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