I had the same problem with my r5t last weekend. Sounded great on the box but on the track I was getting no power and no smoke. Fattened up the bottom and the top. Messed with it all day and couldn't get it running right. Took it apart the next day and the piston was beat up on the side and the inner bearing was gritty. Amain has the whole drop in for $144. Don't feel like risking anything and ordered one up. Gonna use the old pin and rod for breakin and throw the new one in when I'm done. Ordered up the bearings from avid for around $35. Under $200 for practically a new Reds isn't bad.