Piston Skirt broke

[mbg75]

cast pistons (such as stock) are known to crack at the skirt. this is due to too much clearance between the piston skirt and the bore as the motor wears (or improper clearance on new motors). the up and down motion of the rod and crank causes the skirt to slap forward and back. this usually can be heard as piston slap before the skirt breaks.

running a forged piston such as a wiseco usually solves the problem, as the forged piston will actually start to bend near the skirt instead of cracking.

either way you should be able to hear it before it causes damage.

[MN250R]

Thanks for all the replies, im gonna bring the cylinder up to a machine shop and have it looked at and done right the first time.