![]() ![]() I’d like to try and keep it in the 10:1 area just so I can stay with the premium gas. The only thing was that according to Namura’s website all the piston kits for the 400EX were 11:1 compression. ![]() While looking at pistons the Namura piston seemed to be best quality that I could find as far as cast ones go. I don’t do any racing, but I do ride hard and was figuring on sticking with the stock cast type piston. It doesn't seem to be burning any oil though cuz there's no smoke whatsoever coming from the exhaust. ![]() Added a little oil and it when up just over 100psi. Did a compression test on my 400EX the other day and found out that my rings are a little worn – read 80psi – should be 100-128psi. ![]()
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