Grom/MSX 125 upgraded head.
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FinBro stiffer valve springs, hand ported intake and exhaust runners, larger intake and exhaust valves. Made to be used with ANY aftermarket cam and ANY other BBK jug and piston combination to help allow engine to breath.
Includes NEW head and exhaust gaskets.
NO "shimming" required for testing different aftermarket or OEM cams.
OEM Valve size: 25.5mm intake/ 20.95mm exhaust
FinBro size: 26.5mm intake/ 22mm exhaust