Review on Namura NA-10003 Standard Piston Kit for Honda TRX400EX by Rolando Munoz

So far so good. I used this in my recent top end restoration. That piston and valve action gave me 140psi of compression. The piston looks and feels very high quality. My only complaint is that the piston looks so cool, but it's hidden in the cylinder and I can't see it anymore. I noticed that the installation was a bit fiddly. (Although it will be up to me) As a suggestion for anyone this may apply to: be sure to follow the instructions on their website (rings have a top and bottom and a specific order [obviously] and the plunger needs to be in the correct one Alignment.) Due to the hemispherical shape of the piston, correct valve timing is critical, otherwise damage to the valve is inevitable.