CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 19 -
ID of piston pin hole 13.002-13.008 13.04
OD of the piston pin 13.992-13.000 12.96
Clearance between the piston pin and the hole 0.002-0.014 0.02
ID of the small end of the connecting rod 13.016-13.027 13.06
Trouble shooting
●In case of difficult starting, unsteady low speed running, check if there is any problem.
Low compression pressure
●The piston ring worn, burnt/broken
●The cylinder or the piston worn or damage.
Too high compression press
●carbon deposit on the piston and the combustion chamber.
White smoke out of the exhaust pipe Knocking noise by the piston.
●The piston ring worn/damaged. ●The cylinder, the piston or the piston ring worn
●The piston/cylinder worn or damaged. ●The piston pin and piston hole worn.
3.3.2 Removing the cylinder
Detach the cylinder head
Remove the chain guide of the cam chain
Remove the cylinder
Remove the cylinder gasket and the locating pin
from the the cylinder.
3.3.3 Removing the piston
Remove the piston pin circlip.
Attention:
Don’t drop the circlip into the crankcase
Take out the piston pin and then the piston
Push the piston pin from the side opposite the
removed snap ring
Pay attention to avoid scratching the piston surfaces
Checking the piston, the piston pin and the piston
ring.
Attention:
Don’t damage or break the rings.
Clear off all the carbon deposit from the ring groove.
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