What fork seal fits a KTM 640 Adventure?

The KTM 640 Adventure uses a front fork that changed across model years: 50 mm (1998–1999), 43 mm (2000), 48 mm (2001–2007). 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 Adventure fork?

The KTM 640 Adventure has a front fork that changed across model years: 50 mm (1998–1999), 43 mm (2000), 48 mm (2001–2007).

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 Adventure.

KTM 640 Adventure Fork Seals

Q: What fork oil does the KTM 640 Adventure use?

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

Fork specs for the KTM 640 Adventure vary by year (see the table below).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.

Years	Fork tube	Fork
1998–1999	50 mm	wp
2000	43 mm	wp
2001–2007	48 mm	wp

Kit	Years	Seal size	Replaces OEM
55-114	2000	43x53x9.5	KTM 43570623, KTM R14049
55-131	2001–2007	48x58x9.5	Yamaha 1C3-23145-L0-00
55-134	1998–1999	50x60x10.5	n/a
57-105	2001–2007	n/a	n/a
57-106	1998–1999	n/a	n/a
57-137	2000	n/a	n/a
56-126	2000	n/a	n/a
56-146	2001–2007	n/a	n/a

Verified fork kits we stock for your KTM 640 Adventure

Fork Seal Kit

Fork Oil Seal Kit — Gas-Gas EC250 (2012) + 174

$19.12

Fork Seal Kit

Fork Oil Seal Kit — KTM Adventure 640

$19.12

Fork Seal Kit

Fork Dust Seal Kit — Beta RR 2T 125 (2019-2023)

$19.50

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 — Gas-Gas EC125 — 5 Make...

$39.78

Fork oil for your KTM 640 Adventure

A fork-oil change on the KTM 640 Adventure 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.