Finally found it! The preload adjuster that works on the Zephyr 400/550 is the W650 series HYPER PRO

■Preload adjuster black
KAWASAKI W800 ’11 ~ ’16
KAWASAKI W650 ’99 ~ ’08
KAWASAKI W400 ’06 ~ ’08
Part number: 22671101

The front fork outer diameter is . . .
39 mm.

39 mm is rare, super rare. Like a manatee?

The one for W400/650/800
can be adapted.
Finally
I can apply preload . . .

Don’t skip to the end or you’ll be in for a surprise!

First, let me introduce
the product.

For the price,
the quality and feel are outstanding!

  • Satisfying click feel when turning
  • The top side dimension doesn’t change
  • Knob color options (black/gold/red)

It’s so good I’d love to put it on the Inazuma 1200 too.


I checked the Active website and found
hmm, there’s no setting for it.

Well, that makes sense because
in the first place
they only set up bikes with
“no preload adjustment”
from what I can tell, the max is around 41 mm


Fork cap dimensions
Thread size/pitch is “M34-P1.00”

The O-ring part number is common
Kawasaki 92055-1050

Let me line them up where there’s more surface . . . what?

One click = 0.5 mm

Total of 30 clicks

Total of
15 mm preload
you can apply.


Clever design—
whether you loosen or tighten it,
the top side length never changes.
No need to worry about interference.

Preload adjustment changes the ride feel.
A 15 mm adjustment range is substantial.
Read the Active instruction manual too.


Won’t fit with the stock handlebar post.

The handlebar sits right above
the fork cap, so
you need to offset it.

This offset issue is exactly why
I couldn’t install it all this time.

ハイパープロ(HYPER PRO)
¥23,016 (2026/09/20 15:33時点 | Amazon調べ)
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