Single: up to 12 mm valve lift, perfect up to 6000 rpm.
Double: up to 16 mm valve lift, perfect up to 7500 rpm.
Extra double: Same characteristics as the dual, but they are made out of a material that offers more resistance and is stronger, resulting in higher capacity of the engine.
ATTENTION! Due to the double valve springs you have to remodel the stock cylinder heads.
1107Spark plug bushings, 4 pieces
1720Cylinder head, bare, dual port, Combustionchamber: 51ml (3.11 CI)
1720-01New cylinder head, dual port, empty
1720-02New cylinder head, dual port, empty
1721New cylinder head, dual port, with valves, Combustionchamber:...
1721-050Rebuild cylinder head, 30 hp
1721-1Rebuild cylinder head
1721-2Rebuild cylinder head, single port
1721-3Rebuild cylinder head, dual port
1721-4NOS cylinder head 1600 single port
1730Single valve springs (30% stronger than stock style), 8 pieces
1731Dual valve springs, 8 pieces
1732-1Valve retainer, Chrome Molybdene, set of 8 pieces
1732-2Valve retainer, Titanium, set of 8 pieces
1732-3Valve retainer, original model, each
1732-500Valve retainer 25/36 hp / Okrasa style, each
1733Retainer clips, set of 8 pairs
1733-250Retainer clips 25/30 hp / Okrasa style, 8 pairs
1734Valve springs with aluminium retainers and clamps, full...
1735Valve spring, standard, each
pieces of # in shopping cart.