It'll break if you don't...

From Owner's Document

All items are generally accepted for all Husaberg models.

To confirm speciffic differences check out your bike's sector at the bottom.

Light yellow for 400/450, light blue for 470/501, yellow for 550/650.

Husaberg generic info

Kickstart shaft

The kick shaft, item 14 on page 35 of the 03 parts book shows the replacement kick shaft P/N230156-01 . I think the final configuration was 04 model, which is listed in the 04 parts book as an 03 part, number 800.33.050.000. If it were me I would get the 04 part number

The diameter of the shaft next the spline was necked way down in the 01/02 design IIRC, and kept braking. The replacement part is larger in diameter and is much stronger. (joeUSA)

Side-by-side comparison of upgraded kickstart shaft

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Silencer

Rivets loosen and wear oval-replace regularly!

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Speedo support

Billet surround. Panoram/trailtech will break after a couple of falls so fit a billet surround.

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Gear lever

Loosens. Loctite or longer screw with locknut is better. '04 lever - curved alloy.

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Ignition cover

Wiring tube splits-plastic is brittle. Shepherds crook the end to stop water entering. Zip tie & silicon. Water comes down the ignition wire tube, so kink 180d and zip tie hard! Drill hole in case from underneath. Will self-dry. Fit loose split pin. To stop getting moisture in, silicon sidecover on. Running engine will push water out.

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Ignition stator

Corrosion and rust is a reason for failure. Cover stator in Vaseline.

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Wiring Around battery and headstock

Acres can be removed as actually unnecessary. Most wires around battery solenoid do little, stator wiring tube should be replaced and fed around back of starter motor. Change the fusebox to "staple" type fuse.

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