1985-1987 Honda TRX 250 Fourtrax 250 Service Manual, Page 64Get this manual
CYLINDER HEADIVALVES VALVE SPRING FREE LENGTH Measure the free length of the inner and outer valve springs
SERVICE LIMITS:
Inner: 35 .2 mm 11.39 inl
Outer; 38.0 mm 11.50 In) Replace the springs if they are shorter than he service limits
VALVE STEM -TO-GUIDE CLEARANCE
Inspect each 8lve for bending, burning or abnormal stem
wearCheck valv8 movement In the guide and measure and record
each valve stem 0.0SERVICE LIMITSIN: .45 mm 10.215 in) EX.43 mm 10 .214 inl