US$ 39.95
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Our cobra CX50 inserts are made in house to fit our Billet high flow Phathead shell or the OE cast cylinder head shell
K21 - 21
KTM85 2025+ Phathead cylinder head kit GasGas MC85 Husqvarna TC85 supermini
Honda CR125 Phathead cylinder head kit 2000-2003
H33 18
Kawasaki KX500 Phathead Combustion Chambers cobra Our cobra CX50 inserts areChamber selection: K51 42cc Stock compression K52 40. 6cc (100+ octane)K53 38. 2cc (105+ octane)