YX140 Race Valve Set
 
These valves have a different flow angle at the back of the head and a shallow well on the face of the valve. These changes will direct the air & fuel mixture into the chamber better and increase compression ever so slightly more.
 
The valves also are machined correctly with a hard wearing coating unlike cheap chinese valves.
 
We have tested these valves and when fitted correctly with the correct spring pressure with have over 100 hours on 1 set which haven't stretched or worn the valve seat loosing compression like we found with stock valves at 20 hours use.
 
Fits Engines:
YX140
ZS140
ZS110
ZS125
 
Spec:
Length Intake = 66mm
Length Exhaust = 65.30mm
Stem O.D = 5mm
Head O.D Intake = 27mm
Head O.D Exhaust = 23mm
Weight = Each valve is 1g lighter than a stock valve.

Item Includes:
1x Race Valve set
 
Please NOTE: 
If installing on an old valve seat then the valve seat may need refacing in order to have a proper seal with the new valve.