Z900RS Main harness replacement MOSFET regulator Watanabe full power kit and other electrical systems

I was thinking, “How many Z bikes are you going to swap through?” and the answer came back: it’s gotta be a Z1!

That’s deep. Smoke was pouring out from around the headlight area too, so the request is to replace all the electrical wiring.

Looking at the parts to be replaced… I always feel a bit deflated.

It’s like doing a puzzle, you know? Let’s start with the headlight, which is supposedly the easy part.

I lightly polished the thin rust on the inside.

The burned area is at the right switch connection point.

The cause is unclear, but there’s DIY work all over the place, so it might be from that.

I’m removing everything that needs to come off.

The harness is pretty minimal—I’m like, seriously? That’s classic old bike for you.

I adjusted the gap using the play in the mount.

Plugs #3 and #4 are slightly black. Since we’re installing the Watanabe, I’m checking and adjusting the gap.
But they were already adjusted.

The customer also requested a meter replacement.

I’m wondering if the meter mount is rigid—feeling the mystery of the Z.

The more you take apart, the more unsettling it gets.

An imported gasket was installed.

The cut looks kind of odd… I’m a bit concerned.

Since it wasn’t specifically requested, I’ll track down the source of the leak and seal it up.

The plating doesn’t look great—there are droplet-like bumps and raised edges.

I worked through it carefully, so it should be fine.

That’s how it is. There’s a bit more to come.

【Work progress】
● Harness removal
● Headlight replacement
● Clutch cover inspection and installation
● Watanabe pulser installation
● Spark plug gap adjustment
● Meter disassembly and parts ordered

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