YX140 Race Valve Spring Set
 
These spring kits enhance valve seating pressure when closed, without being excessively aggressive when the valve is fully open. This balance enables the engine to achieve significantly higher RPMs.
 
Currently, these spring kits have been thoroughly tested in our Type R engines, demonstrating substantial gains in RPM curves.
 
Please Note:
Can not be used with camshaft that has a higher lift than 7.2mm (STD,Z40 and TB are ok to use)
Must not be fitted with valve spring base washers.
Customer to fit at their own risk.
Valve seating pressure has been increased which may see increased valve wear, valve stretch and valve seat wear. 
 
Fits Engines:
YX140 - 1P56FMJ
ZS140 - 1P56YMJ

Item Includes:
4x Valve Springs