Yamaha TZ250M1 Owner's Service Manual page 125

CYLINDER HEAD, CYLINDER AND PISTON
5. Check:
• Power valve smooth movement
Unsmooth movement ≥ Repair or replace.
EC475270
Piston ring and piston
1. Install:
• Piston ring 1
NOTE:
• Take care not to scratch the piston or damage
the piston ring.
• Install the piston ring with its mark "N"
upward.
• Align the piston ring gap with the pin 2.
• After installing the piston ring, check the
smooth movement of it.
2. Install:
• Gasket (cylinder) 1N
• Small end bearing 2
• Dowel pin 3
NOTE:
• Apply the engine oil on the bearing (crank-
shaft and connecting rod) and connecting rod
big end washers.
• Install the gasket with the seal print side
toward the crankcase.
4-27
ENG