Description
2cc Stock compression
KX125 all years
This head kit uses the 2024 - 2025 style plug with longer reach for an upgrade to the 2009-2023 models
YZ296 - 72mm 100+octane 23cc
Yamaha YZ250 combustion chambers CR500 2cc Stock compression Chamber Selection:SX107 10 (105+ octane) 2025+ YZ250 KTM250SX 2023 2025 Phathead CR125R9300 2cc Stock compression KX125 all years