Question about 2003 ATK 125 4-stroke

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Piston rings positions

I know where the oil ring goes. The other two rings go in which order? - They both look the same size, although one has a shiny edge.

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Hi johanjur
It is important that the rings all go in the right way up and in the correct order. The ring with the shiny edge may be tapered, the shiny edge then should be closest to the top. Check the rings themselves. There are often markings on them, and they generally face upwards. Hpethis helps you. Cheers
regards robotek

Posted on Jan 25, 2009

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The engine has blown. I need to replace it or change pistons and rings. How difficult is it to change pistons and rings?


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--- The following is just a sample of what to do once the engine is torn down: Pistons and Connecting Rods
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    6. Check the ring side clearance of the compression rings with a feeler gauge inserted between the ring and its lower land according to specification. The gauge should slide freely around the entire ring circumference without binding. Any wear that occurs will form a step at the inner portion of the lower land. If the lower lands have high steps, the piston should be replaced. Fig. 6: The notch on the side of the bearing cap matches the tang on the bearing insert tccs3917.gif

  2. Unless new pistons are installed, be sure to install the pistons in the cylinders from which they were removed. The numbers on the connecting rod and bearing cap must be on the same side when installed in the cylinder bore. If a connecting rod is ever transposed from one engine or cylinder to another, new bearings should be fitted and the connecting rod should be numbered to correspond with the new cylinder number. The notch on the piston head goes toward the front of the engine.
  3. Install all of the rod bearing inserts into the rods and caps. Fig. 7: Most rings are marked to show which side of the ring should face up when installed to the piston tccs3222.gif

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1 Answer

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2 Answers

I am changing piston and rings, my problem is that the ring are different, do you know which one go on the top, one is more black or dark than the oder.


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