Impossible to answer, depends on what model KTM you have.
NGK Spark Plug BR8ECM
br10ecmix
0.60mm
NGK BR8ECM
bad plug bad plug cap stator
I have a 07 KTM 525 XCW and the manual call for 6mm on plug gap.
We use the nkg br9eix
the spark plugs might be old
NGK BR8HS with a .032" (0.8mm) gap
0.7 mm
the stater needs to be rewound