Which way must the arrow on the piston point @

arrow alway on most bikes points at the exhaust or outlet side

the cam has arrows marked on it that should line up with 2 marks inside the cam housing. The picture is shoeing the correct position. you will need to put the flywheel on and line it up with the arrow on the flywheel pointing at the right hand side ignition module screw so that the piston is at top dead centre. Once the piston is at TDC then you put the cam gear in and line the arrows up.

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. :)

Arrow always points to the muffler.

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

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

Please rate this answer. Thanks honeymoney30!