Originally Posted by Kenny

Thanks guys,
This is a straight drop-in and is easily reversible. You will probably want a new head gasket, which the Yamaha factory piece is the best AND cheapest. It is also re-usable for the adventurous types. Higher compression by itself is worth more power and torque. 11:1 is only 1 point higher than what you have, but that 1 point combined with the tighter squish area work together to make a more efficient, and responsive engine. They are good for 2 hp or so and a similar gain in torque. The 12.5:1 is worth another 1-1 1/2 hp over the 11:1, but requires higher octane gas. Yes, I will ship them anywhere(even Greece). I decided to build these pistons knowing that I will never sell one in this country. I am waiting to find out a positive lead time for production. Hopefully we will be looking at 2 weeks. The trick is gonna be collecting orders and putting it all together. I will talk with Wiseco tomorrow to get a definite.