2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 145Get this manual
CYLINDERPISTON
SERVICE INFORMATION
GENERAL
This section covers maintenance of the cylinder and pistonThe cylinder and piston can be se rviced with the engine installed in the frame Be careful not to damage the mating surfaces when removing the cylinderDo not strike the cylinder too hard during removal Take care not to damage the cylinder wall and piston Rocker arm lubricating oil is fed through the oil passage (stud bolt hole) in the cylinderClean the oil passage before installing cylinder
SPECIFICATIONS
ITEM Cylinder 1.0Out-of-round Taper Warpage Piston 0.0at 15 (0.6) from bottom Piston, piston pin, Piston pin hole 1.0piston Piston pin 0.0ring Piston-to-piston pin clearance Top Piston ring end gap Second Oil (side rail) Piston ring -to-ring groove Top clearance Second Cylinder-to-piston clearance Connecting rod small end 1.0Connecting rod-to-piston pin clearance STANDARD 68.50068.510 (2.69682.6972) Unit mm (in) SERVICE LIMIT 68.60 (2.701) 0.10 (0.004) 0.10 (0.004) 0.10 (0 .004) 68.40 (2 .693) 15.04 (0.592) 14.96 (0.589) 0.02 (0.001) 0.5 (0.02) 0.7 (0.03)