New NGK Recommended Spark Plug BR9ECM for the models listed.

2008-2011 KTM 105SX

2008-2009 KTM 105XC

2007-2008 KTM 144SX

2009-2021 KTM 150SX

2010-2015 KTM 150XC

2017-2021 KTM XC-W/ W TPI