Yamahamt110 motor . which way must the arrow on the piston point

Normally the arrow faces the exhaust side. I've never seen 2 arrows?

the arrows on all pistons face to the front of the engine

arrow points towards exhaust, direction of gasses http://www.mediafire.com/download/56zr9s967sf9a98

The 'Arrow' on the piston always points in the direction of air flow through the cylinder. So it should be pointing towards the exhaust port. :)

pistons are usually fitted with the arrow facing toward the front of the motor...

the arrow on the piston points to the front where the exhaust pipe is

the arrow always goes towards the front of the engine

just looked at a couple of pistons not sure what the letters mean ,,,but when installing the piston make sure the arrow always points to the exhaust port of the cylinder

both 2 and 4 stroke motor pistons will have and arrow on the piston, this points to the exhaust port,2 strokes have locating pins for the rings and the end of the rings go to these pins,as you will not be able to get back into the barrel if not fitted like this. 4 stroke rings are posistioned at 120 degree intervals to each other so the end gaps dont line up and there will be numbers stamped on the top and scraper rings which you face up.

The arrow should point to the front tire. I'm surprised the parts guy didn't tell you.

Please rate this answer. Thanks honeymoney30!