top end rebuild?? which to buy

[2002TRX400ex]

I am getting ready to rebuild my topend i have a 2006 yfz 450 i ride trails and gravel pitts and tracks every once in a while.. I want to keep stock compression i think.....what brand of piston is the best to buy and also was thinking about doing the timing chain and tensioner should i get all factory yamaha replacement parts or is there a better after market brand to purchase? Is there anything else that should be done while replacing the top end thanks for the help.

[Ride1Rob]

You shouldn't have to change your tensioner. They don't go bad that often. As far as pistons go... If you're gonna stay stock compression there's nothing better than the stock piston. If you're gonna go HC the CP is the best on the market.