Orange????
the stater needs to be rewound
1250 CC's.
The 2001 KTM 520 typically uses 5-weight fork oil, but it's always best to consult the owner's manual or a service manual for specific recommendations. The oil capacity for the forks is approximately 420 ml per leg, depending on the specific model and setup. Ensure to use high-quality fork oil designed for motocross or off-road applications for optimal performance.
I would first unhook the kill switch to make sure it is not shorted out. Next I would look at the stator.
NGK CR8EK or NGK CR8EiX (Iridium)
No.
First disconnect your kill switch, if that is not it, check your plug cap, then if that is not it go on to your stator.
The vin number listed above is for a 2001 KTM 50SXR.
4
50:1
Again it depends on which model you are asking about. A 520 SX (4-speed) will top out at around 70 mph depending on the gearing. The six speed 520 EXC will run 100 mph. It's not that the 520 SX is slow its just geared for the track and there's no motocross track that you would you run 80-100 at.
KTM recommends Motorex Top Speed 4T 15W50 oil 0.7 L