Just about everything, following is some differences between the 450 SX and 450 EXC.
The EXC is a 6 speed with a dry weight of 252 lbs, compression of 11.9:1, electric start and is street legal.
The SX is a 4 speed with a dry weight of 231 lbs, compression of 12.5:1, kick start (09 450 is e-start I believe) and is not street legal.
the engine power and the seat height
Yes they just made it street legal because everyone was just converting them illegally anyways.
Got this off of KTM talk, 44HP for a 450 exc.
No, 93-97 ktm 250-360 exc will fit it, not much else. found out the hard way on my 96 ktm 360exc
ask at a ktm shop
The 2004 ktm 450 EXC has 48Hp
Rent a Ktm Bike with endurobikes.co
im a 200 plus person and my 380 topped out at 98 and that was pushing it hard. That is all stock parts
Stock 04 250 EXC has29 hp.
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Silver
The KTM 450 EXC is a motorcycle vehicle that is often classified as a dirt bike. The vehicle is highly recommended on the market and typically comes in the color orange.