[Unicorn GSX1200S] FCC Enhanced Clutch Kit Installation. Solid power transmission for the oil-cooled engine’s hefty torque.

We’re tackling everything all at once.
New customers really do have a lot to do—it’s kind of nice, I think.
*By the way, for our crowdfunding newcomers: general new customer intake is currently suspended, but we’re considering it for the future.

Today’s Maintenance Log

Vehicle: Unicorn Japan GSX1200S KATANA

Parts: FCC Traction Control Clutch Kit

  • A set of Kevlar-infused friction discs and optimized reinforced springs.

Purpose: Prevent clutch slip caused by the massive torque of the 1200cc oil-cooled engine and ensure reliable power delivery to the rear tire.

Result: Crisp, satisfying engagement. The bike now surges forward with every bit of throttle you give it.

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J・TRIP OFFICIAL online shop
¥38,500 (2026/09/21 07:35時点 | 楽天市場調べ)
ハセガワ(Hasegawa)
¥1,070 (2026/09/20 16:33時点 | Amazon調べ)

Oil-cooled 1200 only: “214-S0202-05”

There used to be various lineup options.
Being a cheapskate, I often went with just the plates, but now it’s sleeve hub assembly only.

ウェビック 楽天市場店
¥67,546 (2026/09/21 11:35時点 | 楽天市場調べ)

If you plan to replace it in the future, stock up now.
Prices won’t drop, and we need to consider the possibility of discontinuation.

Having spares on hand gives you peace of mind.

Oil-cooled 1200 only: “214-S0202-05”

The sleeve hub set switches to a coil spring.

The oil-cooled engine is fantastic for serviceability.

It popped open and was nice and clean.
With this new FCC kit, the sleeve hub assembly and all the plates get replaced wholesale.
Basically, you don’t even need to remove the plates.

Soak them in fresh engine oil.
Once they’re thoroughly saturated,
it might just be a placebo, but after a long time off the bike, putting it in low and stalling out! seems to happen less.

Tighten firmly to 150 Nm and stake it.

Watching how much pressure you’re applying is useful reference too.

ウェビック 楽天市場店
¥67,546 (2026/09/21 11:35時点 | 楽天市場調べ)

Generator Damper Replacement

I touched the iPhone lens and it got fogged up…
The damper condition wasn’t particularly bad.

Clean the crankcase while you’re at it.

イチネンケミカルズ(Ichinen Chemicals)
¥749 (2026/09/21 23:35時点 | Amazon調べ)

I polished it as much as I could (*´ω`*)
It’s not a visible spot, but I have a feeling it boosts motivation.

I use thread locker and stake it.
Better safe than sorry—the next time might be 10 years from now.

Polishing the starter motor mounting base gives you extra peace of mind.
The starter grounds here, so

good grounding = better starter spin?

That’s the gist of it, and there’s a bit more to come.

Unicorn Japan GSX1200S: Installing an FCC Enhanced Clutch Kit.

Vehicle: Unicorn GSX1200S Katana. Parts: FCC Traction Control Clutch Kit. Details: After perfecting the chassis, it was time to upgrade the drivetrain. The massive torque of the 1200cc oil-cooled engine can cause the stock clutch to slip under hard acceleration. The FCC kit uses Kevlar friction plates and upgraded springs to ensure 100% power transmission to the rear wheel without making the clutch lever overly stiff. Verdict: The engagement is crisp and direct. The throttle and the rear tire feel perfectly connected. A must-have upgrade for big torque engines!

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