you got to take off the gas tank, remember to shut off the fuel before unplugging the fuel line, you got to take off the radiator shrouds then the seat, the tank bolts in at the seat, i got an 04 exc 250 2 stroke and that's how you do it to mine. you might want a manual bro. ha with those to strokes its needed quite a bit... just sayin but most awnsers you can get off thumper talk, its almost the same thing but all the people ride dirt bikes
Impossible to answer, depends on what model KTM you have.
NGK Spark Plug BR8ECM
bad plug bad plug cap stator
I have a 07 KTM 525 XCW and the manual call for 6mm on plug gap.
br10ecmix
0.60mm
NGK BR8ECM
We use the nkg br9eix
NGK BR8HS with a .032" (0.8mm) gap
0.7 mm
under the gas tank
In the center of the head (on top of the cylinder).