There is no fuel/oil ratio, the 03 KTM 450 EXC is a four stroke. See link below.
Got this off of KTM talk, 44HP for a 450 exc.
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.
it is about 37 horsepower
48 hp
No, 93-97 ktm 250-360 exc will fit it, not much else. found out the hard way on my 96 ktm 360exc
The 2004 ktm 450 EXC has 48Hp
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.
A standard Mod 52: Exc VG Good Fair Poor 550 450 350 200 225
Check for loosed connections. wire, Speaker's, exc.
Transmission: Motorex Top Speed 15W50
NIB Exc V.G. Good Fair Poor375 300 250 225 175 100100-450 USD0-300 USD depending on condition.