What fork seal fits a KTM 640 LC4 Supermoto?

The KTM 640 LC4 Supermoto uses a 48 mm fork. We stock the manufacturer-verified seal and bushing kits for it; matching is done off the verified application list, not just the seal size.

What size is the KTM 640 LC4 Supermoto fork?

The KTM 640 LC4 Supermoto has a 48 mm fork.

Can I use any seal with the same dimensions?

No. Fork seals can share a size and still not seat correctly in a different fork design, so use the seal verified for your bike. The kits listed here are confirmed by the manufacturer to fit the KTM 640 LC4 Supermoto.

KTM 640 LC4 Supermoto Fork Seals

Q: What fork oil does the KTM 640 LC4 Supermoto use?

The KTM 640 LC4 Supermoto uses 4wt fork oil, about 480 ml per leg (factory fill WP/KTM Fork Oil SAE 4 (48601166S1)).

The KTM 640 LC4 Supermoto runs a 48 mm front fork.Every kit here is verified by the manufacturer to fit this exact bike. Fork seals can share a size and still not seat in a different fork, so we only list what is confirmed for your bike.

Fork tube48 mm

Kit	Years	Seal size	Replaces OEM
55-114	2000–2001	43x53x9.5	KTM 43570623, KTM R14049
55-134	1999	50x60x10.5	n/a
57-106	1999	n/a	n/a
57-137	2000–2001	n/a	n/a
56-126	2000–2001	n/a	n/a
56-148	1999	n/a	n/a
38-6053 (bushings)	2000–2001	n/a	n/a

Verified fork kits we stock for your KTM 640 LC4 Supermoto

Fork Seal Kit

Fork Oil Seal Kit — KTM Adventure 640

$19.12

Fork Seal Kit

Fork Dust Seal Kit — BMW F800GS (2013-2017) +

$21.01

Fork Seal Kit

Fork Oil & Dust Seal Kit — Gas-Gas EC125 (2003)

$39.78

Fork Seal Kit

Fork Oil & Dust Seal Kit — KTM Adventure 640

$39.78

Fork Bushing Kit

Fork Bushing Kit — KTM EXC 125 (2000-2001) + 29

$63.54

Fork oil for your KTM 640 LC4 Supermoto

A fork-oil change on the KTM 640 LC4 Supermoto uses 4wt fork oil, about 480 ml per leg. Factory fill: WP/KTM Fork Oil SAE 4 (48601166S1). We don't stock 4wt yet, so the closest weight we carry (5wt) is shown below.