honda MB5 39mm stock piston
honda MB5 39mm stock piston



stock 39mm piston for honda MB5 and other models with the same engine

includes piston, wrist pin, wrist pin clips, lower helper ring and two 39mm x 1.5mm GI rings

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5 of 5 Make sure you orient rings correctly!! April 1, 2024
taco eater : Durks77 from Greenland, NH United States  
There is a slight bevel on the ring surface that is supposed to be facing up.

the rings are not marked and they fit in the slots both ways, but you can tell that you have it in the right orientation by squeezing and turning the ring. if it is upside down there will be resistance and if you got it right side up then it will be much smoother.

Hard to see it but if you squint real hard the chamfer is there! Will overheat if installed upside down.

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