KTM 450 EXC
|Also called||KTM 450 XC, KTM 450 XC-W|
|Predecessor||KTM 400 EGS|
|Engine||Single-cylinder, liquid-cooled, 4 Valve/SOHC, Fuel Injected, 4-stroke|
|Bore / stroke||95 mm / 63.4 mm, 449.3 cc|
|Power||51 hp (38 kW)|
|Ignition type||Kokusan contactless, electronic, digital ignition timing adjustment|
|Transmission||6 gears, wet clutch operated hydraulically, chain drive|
|Frame type||Central double-cradle-type 25CrMo4 steel|
Front: WP USD 48mm; fully adjustable, 300 mm travel
Hydraulic single disc Front :260mm (10.24")Rear: 220mm (8.66")
|Rake, trail||26.5°, 4.4 in (110 mm)|
|Wheelbase||1,482 mm (58.3 in)|
|Seat height||970 mm (38 in)|
|Weight||111 kg (245 lb) (dry)
|Fuel capacity||2.51 US gal (9.5 l; 2.09 imp gal)|
|Related||KTM 250 EXC, KTM 350 EXC, KTM 500 EXC|
The KTM 450 EXC is a 4-stroke enduro off-road motorcycle made by KTM. The models are the European road legal 400 EXC and 450 EXC, the US 450 (Close Ratio) XC and 450 (Wide Ratio) XC-W. The European EXC versions have a small headlight, speedometer, tail-light and somewhat softer linkless (PDS) rear suspension. The US EXC is 50-states street legal.
2000 - 2002
The factory RFS (Racing Four Stroke) KTM 400 EXC won the 1999 World Enduro Championship. The 2000 RFS KTM 400 EXC had a right side kickstarter but also had the E-start button. KTM took a different approach to the configuration of the motor than most other manufacturers. While others used a 90mm-plus bore piston with a very short stroke of 60mm, the KTM RFS motor used an 89mm x 64mm configuration which provided more torque at the expense of higher RPM's. 
This was the first year of the 450 EXC model. It evolved from the earlier 400 EXC model, with an increased displacement via a longer stroke.
These years saw a new frame. Improving the handling without major changes. Rear body work changed to the single piece design off the SX model. The 2006 450 EXC made 42 hp (31 kW) and 37.5 ft-lbs. torque. 
This was the first year that the 450 EXC was offered in full factory 50-state street legal trim. The conversion of the previously available model required changes in gearing, exhaust, DOT approved tires and lights and the addition of turn signals, and a horn. Other than these changes the bike was virtually the same as the previously off-road only bike. The US off-road only version of the EXC was replaced by the XC (Close-ratio transmission) and XC-W (wide-ratio transmission) models. 2007 was also the last year of the RFS motor. The RFS is very torquey and is known to have very good reliability. In some cases, the fully stock engines last for more than 45k miles. The RFS bike is known to be a good dual sport and super motard bike. The wide ratio 6-speed transmission will run all day long on the highway. Due to their dual-sport ability, there are larger aftermarket fuel tanks available (11~26L).
2008 - 2009
As of 2008 the US version of the 450 EXC continued to be sold in street legal trim but was replaced by the off-road only 450 XC or 450 XC-W in the US market. A new chassis was introduced in 2008 with improvements in suspension and handling. The RFS motor available in 250 cc, 400 cc, 450 cc and 510 cc models between 2000 and 2007 was replaced with the XC4 motor beginning with the 2008 model year. The XC4 450's have more power; with a 95 mm x 63.4 mm bore and stroke producing about 51 hp (38 kW). Reliability may have gone down; some people experience top-end issues with the new engine, while others run without incident.
2010 - 2012
Offered as the Champions Edition in 2010. New features include new front Brembo brake caliper, PDS needle design, frame welded to steering head 10mm lower, reinforced gear box (1,2,5,6 idler gears), reworked chain adjuster & clamping rail, better tension on timing chain (noise reduction).
2013 - 2016
For 2013, new features include EFI Fuel-injection, a diaphragm spring clutch and a lighter battery.
2017 - Present
For 2017, KTM redesigned the 450 from the ground up. A new chassis, motor, ergos, and WP XPlor 48MM forks and PDS shock. They achieved a weight reduction of 5kgs from 2016. The seat height was lowered by 10mm to 38 inches and the foot pegs raised by 6mm for better ground clearance.
- Scott Rousseau (19 June 2015). "2015 KTM Dual-Sport and Cross-Country Dirt Bikes". Off-Road.com. Retrieved 20 February 2016.
- "KTM 400 EXC". Motorcycle Specifications. Retrieved 24 February 2016.
- JC Hilderbrand (2 May 2006). "2006 KTM 450 EXC Comparison". Motorcycle-usa.com. Retrieved 24 February 2016.
- James Holter (2011). "AMA Tested: KTM 450 EXC". americanmotorcyclist.com. Retrieved 24 February 2016.
- "KTM Motorcycle History". Motorcycle USA. February 23, 2008. Retrieved 2013-06-23.
- Gardiner, Mark. "KTM Motorcycle History". motorcycle.com. Retrieved 2013-06-23.
- "KTM EXC 2008 Test". 1000ps.at. Retrieved 24 February 2016.
- Guy Streeter (May 27, 2016). "2017 KTM 450 EXC-F". MotoOnline.com.au. Retrieved 2017-05-12.
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