There is no fuel/oil ratio, the 03 KTM 450 EXC is a four stroke. See link below.
1.2 litres
.7 L
650cc of 10w30
1.35 L
10w30 will be just fine.
ktm recommend you use a 10w30 oil for the 2 stroke and you will need 0.75 litres make sure you get all the old oil out though otherwise you will overfill it and that can be as bad as under filling it ..
Hi my name is Doug , I have not ride my bike for a year and I forgot what is ratio for premix . It's 99 KTM 300 exc . I think its 21.0 . I forgot . Can you help me ?
KTM recommends Motorex Power Synt 4T 10W50
Transmission: Motorex Top Speed 15W50
KTM recommends 1.35 L of Motorex Power Synt 4T 10W50.
hw much gearbox oil do you put in your ktm 525