Honda Grom/MSX 125 SuperHead, with NEW 30.5mm intake porting to match KOSO 34mm larger throttle body.
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Redesigned FinBro SuperHead for maximum air delivery. Still includes the upgraded stiffer valve springs, NEW larger 30.5mm hand port and polished intake and exhaust runners. Compatible with ANY aftermarket BBK but best when paired with the 125cc OR 147cc, for larger bore sizes please contact for better options.
Includes NEW head and exhaust gaskets.
OEM Valve size: 25.5mm intake/ 20.95mm exhaust
NEW FinBro SuperHead size: 27mm intake/ 23mm exhaust