I really didn't want to shell-out $1500 (+) for a pair of Cup forks from KTM So, I remember reading that the outer/upper tubes were the same diameter on both the bikes (and the same length ). Looking on ebay I found a nice pair from a 2012 RC8 R for only $400. So I thought I would take the chance and see if I could make them work on the 390.
I had to make some axle spacer/adapters, so I could use the stock 390 axle. Then for the brake, I used a 10mm off-set 320mm diameter brake rotor from a monster/916/748 mounted Backwards so it would line up in the center of the caliper.
Also had to slightly, machine off a millimeter or so from the front (now back) mounting surface face of the rotor carrier to get it all to line up correctly.
The other benefit was also being able to use a real Brembo caliper on the one side (awesome braking now !).
Of course being that the forks came off a heavier machine, I re-sprung them with lighter springs. It all works great and now with full damping adjustability, I have a wide range to dial them in !
(Oh yeah, the front fender is also from a RC8)
I had to make some axle spacer/adapters, so I could use the stock 390 axle. Then for the brake, I used a 10mm off-set 320mm diameter brake rotor from a monster/916/748 mounted Backwards so it would line up in the center of the caliper.
Also had to slightly, machine off a millimeter or so from the front (now back) mounting surface face of the rotor carrier to get it all to line up correctly.
The other benefit was also being able to use a real Brembo caliper on the one side (awesome braking now !).
Of course being that the forks came off a heavier machine, I re-sprung them with lighter springs. It all works great and now with full damping adjustability, I have a wide range to dial them in !
(Oh yeah, the front fender is also from a RC8)