First : exhaust port.
1) valve guide boss removed
2) exhaust port opened to 39mm/28mm
3) exhaust port track enlarged as straight as possible
Standard :
Opened for 1.5'' valve :
UBV head porting
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UBV head porting
I started the futur pair of heads for F5000 project.
First : exhaust port.
1) valve guide boss removed
2) exhaust port opened to 39mm/28mm
3) exhaust port track enlarged as straight as possible
Standard :
Opened for 1.5'' valve :
First : exhaust port.
1) valve guide boss removed
2) exhaust port opened to 39mm/28mm
3) exhaust port track enlarged as straight as possible
Standard :
Opened for 1.5'' valve :
-
topcatcustom
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