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 dirrect the air & fuel mixture into the chamber better and increase compression ever so slightly more.
Also Fits - Zongshen Z140
Item Includes (refer to item picture):
•1x Race inlet valve 27x5x66
•1x Race exhaust valve 23x5x66
Please NOTE - Valve seats may need cutting & guides honing upon installation.