That's something you need to check with a qualified KTM shop about.
Mid 90's stock.
got mine at 99mph
The 450 SX is a single cylinder 4 stroke, so no you do not mix gas.
ktm 450 sx
Got this off of KTM talk, 44HP for a 450 exc.
The KTM sx is fast but the yfz is the best for what I do, what kind of riding do you do?
KTM 50 tops out around 50-52 mph my 06 ktm 50 hits 55-60mph
YFZ 450 WILL SMOKE It
A 450 shoud be 90 to mid 90s
The 2007 KTM 450 EXC produces approximately 50 horsepower. This power is generated by its 449cc single-cylinder, four-stroke engine, which is designed for off-road performance. The bike's lightweight chassis and advanced suspension contribute to its agility and handling in various terrains.
According to the 08 KTM Tech Bulletin, .3L of Motorex Top Speed 4T 15W50
The 2004 ktm 450 EXC has 48Hp