The 82.5 pistons are in. The Wiseco pistons were always heavier than the Honda pistons and have been getting heavier lately as they reduce their production costs. The new pistons are full mod. They are drilled to cool/lube the exhaust bridge. They are windowed which cools the dome and eye browed to prevent snagging the bottom edge of the intake port. The last two also improve intake flow.
Here are some pistons I weighed today, all FL350R
Honda/Art 80mm: 11.8 oz
Aftershock/Wossner 82.5mm: 11.7 oz
Wiseco 80mm with Aftershock mods 12.8 oz
Wiseco 81.5mm: 14.2 oz
The new pistons are machined inside and out, not just the inside. The wall thickness therefore does not go up on the bigger sizes. Therefore the weight does not go up as much either.
Not only is lighter better for power by reducing reciprocating mass, keeping the weight close to the original reduces vibration. The counter balancer was designed to match up to the original piston weight.
