PhatheadRacing
KTM65SX 2009 - 2025 Husqvarna TC65 2024 - 2025 / GasGas MC65 2024 -2025 Phathead cylinder head kit
This head kit uses the 2024 - 2025 style plug with longer reach for an upgrade to the 2009-2023 models.
Use the NGK MR8BI or OE 2024+ spark plug
KTM 65SX 2009 - 2025 Husqvarna TC65 2024 - 2025 / GasGas MC65 2024 -2025 Phathead cylinder head kit
Chamber selection:
SX65 6.2cc stock compression
SX66 6.0cc 100+ octane
SX67 5.8cc 105+ octane
Phathead Kits include a head shell with one combustion chamber, two sets of o-rings, cylinder head nuts, copper washers, some stickers for your bike and tool box and installation instructions..
Phathead cylinder heads are made of 6061 T6 billet aluminum. The material is stronger and transfers heat better than cast aluminum. The two piece design allows an increase in coolant flow as well as surface area which improves cooling for better consistency and performance.