So far so good. I used this in my recent top end rebuild. This piston and a valve job gave me 140psi compression, The piston looks and feels super high quality. My only complaint is that the piston looks so cool but is buried in the cylinder and I can't see it anymore.
I did notice the installation was a bit more complicated. (That would be on me though) As a suggestion for those who this may apply: be sure to follow directions on their website, (the rings do have a top and bottom & specific order [obviously], and piston needs to be in correct orientation.) Due to the hemispherical shape of piston, correct timing is critical or valve damage is imminent.
Very good quality , you will need to make sure all rings are in the right position. Used a protractor and I think sharpie to make where the rings gaps needed to be. And she’ll need a good break in period.
Fit and finish was superb, I was hesitant but this piston was a huge power upgrade paired with a cam on my 400x. I am side by side with 450r's
Piston rings were easy to install by hand. Followed break-in process from (...) and it still looks new after a few days of hard riding.
Obviously anyone interested in this piston is concerned with value. While I haven't run the engine, it's obvious this is a quality piece...
Feature Product
- Namura pistons are made to exact OEM specifications and are direct replacements for OEM pistons with no modifications or dimensional adjustments needed
- Piston kits come with the piston(s) individually wrapped, a set of OEM quality rings packed in their own box, wrist pin(s), and circlips
- Namura pistons have MOS2 (Molybdenum/Teflon) skirt coatings, high-silicon aluminum and anodized domes
- A, B and C pistons are available to help extend the life of expensive Nikasil, SCEM, Boron Composite and Ceramic Cylinders
- Namura rings are made by Riken, the world's largest OEM manufacturer and are the same OEM rings used on more motorcycles and ATV's than any other brand
Description
Namura pistons are made to exact OEM specifications and are direct replacements for OEM pistons with no modifications or dimensional adjustments needed. Namura pistons have MOS2 (Molybdenum/Teflon) skirt coatings, high-silicon aluminum and anodized domes. Piston kits come with the piston(s) individually wrapped, a set of OEM quality rings packed in their own box, wrist pin(s), and circlips. Namura rings are made by Riken the world's largest OEM manufacturer and are the same OEM rings used on more motorcycles and ATV's than any other brand. A, B and C pistons are available to help extend the life of expensive Nikasil, SCEM, Boron Composite and Ceramic Cylinders.
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