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I picked up a 2001 400ex a while ago and I was told it was completely stock, I put a big gun muffler on it and rejetted it. Recently it started to burn some oil so I decided to take it apart to rebuild it and I found out it had a Webcam 450/451 cam in it and everything else is stock I was wondering what mods I could do to make it reliable but also a little more power, I was thinking a high comp piston and run av gas.
 

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Stay away from 100ll avgas. That stuff is nasty if you breathe it. After a cross country flight I was surprised how much lead had been deposited on the sides of the fuselage. Just use 93 octane mogas.
Maybe aftermarket pistons have gotten better over the years but they used to be much heavier than stock. Using them meant early failure of rods and rod bearings. I'd make some phone calls and ask the manufacturer what they weight compared to OEM. If they don't know, walk away.
 
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