2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 26Get this manual
MAINTENANCE SPECIFICATIONS Item Cam chain: Cam chain typeNoof links Cam chain adjustment method Rocker armrocker arm shaft: Shaft outside diameter Arm-to-shaft clearance Valve, valve seat, valve guide: Valve clearance (cold) Standard 92RH2015116 Automatic 11.98111.991 mm (0.47170.4721 in) 0.0090.037 mm (0.00040.0015 in) IN EX Valve dimensions 0.060.10 mm (0.00240.0039 in) 0.160.20 mm (0.00630.0079 in)
Limit 11.951 mm (0.4705 in) 0.08 mm (0.0031 in) -
B Head Diameter Face Width Seat Width
C Margin Thickness
"A" head diameter
"B" face width "C" seat width
IN EX IN EX
"D" margin thickness