Heard the Axys piston is a direct drop in replacement for a pro rmk? Is it a upgrade? How is the Axys piston VS a fix it kit? Just looking to freshen up my boosted 2013 Pro RMK running 8ish lbs of boost.
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I just want to offer my experience as an engineer and an enthusiast who has broken parts. Pistons that are not direct replacements, meaning they weigh the same, are not drop in. Rotating assemblies must be balanced. Dropping in a lighter piston or rod throws the assembly out of balance. Balance is often determined to be within one gram of perfect balance by a seasoned machinist. That being said, you have some wiggle room you can live with in a short lived two stroke motor. The impact will be increased vibration and a shorter rev range...in short, your rev limit will decrease mechanically. The more out of balance you get, the more premature wear will take a toll on your motor and shorten its life. At the extreme, you will break the crank.
So, if you want a lighter assembly, put the axys crank, rods, and pistons in. That way you know the factory has balanced it. Otherwise, throw a good similar weight piston in with a fix it kit to reduce rod angle which will reduce stress on the rotating assembly. As a turbo sled, you should put a fix it kit in and run it. The change over to an axys setup is expensive for small gains in rev. Just my thoughts. But, how you ride will determine if that rev is important to you.