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Inside coating
Product number: 23637B
Compression Ratio STD
20cc volume is the VHM standard for Yamaha YZ125 2001 - 2004 and is developed for the best overall performance
Most of the ProX pistons come with a coating
VHM insert KTM 65SX 2009 - 2023 / Husqvarna TC65 2017 - 2023 / GasGas MC65 2021 - 2023 (5.00cc) for 12° piston AE32167-101 FUEL/CARBS Inside coatingThis insert has a lower volume higher compression ratio than our VHM standard insert, meaning more low and middle range torque. This improves acceleration and gives an increased torque feeling when exiting corners. However, keep in mind that this compromises top speed. The combustion chamber fits the VHM cylinder head perfectly and is easy to change. The last numbers of the part number are engraved on the insert for identification. Use in combination