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KX21 Cylinder Heads

Subaru KX21 Go Kart Engine Cylinder Heads
subaru-kx21-performance-head
many hours of testing have been spent on the flow bench, we tested the stock kx21 Subaru carburettor, straight intake manifolds, curved intake manifolds & round slide carbs. We were surprised at the flow at low valve lift. The heads maximum flow is just before coil bind occurs there became a point where opening the valve more didnt increase flow. Some more development is required with a longer valve to see if the head will flow more with more valve lift.
small-engine-flow-bench
The curved manifold offers a step up in performance over the standard carb to head set up & also repositions the carb away from the rear tyre.The shape of the intake runner with its high port roof & low raked floor has a very wide low angle short turn for the air flow to fill the cylinder.
subaru-kart-manifold-straight
The angle of the valve on the Subaru cylinder head is definitely an advantage in performance.
WE WILL SOON HAVE MODIFIED PERFORMANCE EXCHANGE CYLINDER HEADS
AVAILABLE
Subaru-ex21-performance-camshaft
In its standard form the improved components need for your EX21 engine,  KX21 cylinder head including valve train components, sports camshaft & KX21 carburetor