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TB Big Valve Kit for Honda Grom 125( 2014-2020) Monkey (2019-2020) stock cylinder head
TB Big Valve Kit for Honda Grom 125( 2014-2020) Monkey (2019-2020) stock cylinder head. 4 Speed Engines.
Note: This kit should be installed by a professional mechanic or shop that offers valve job service as the valve seats must be cut to accept the larger valve head diameters and valves sunk deeper to allow for overlap clearances.
OEM Factory Valve size = 25.5mm Intake / 20.95mm Exhaust.
TB Big Valve Size = 27mm Intake / 21.45mm