Found two options (see below) for a higher compression piston in the stock bore but didn't find a lot of info in the forums on this let alone test results.

I contacted 3pracing about the Wiseco piston and according to them it's a straight fit in stock cylinder and the piston was custom made for them which makes sense as there is no other info on this piston on the web anywhere. It says 11:1 'standard' compression ratio but as it looks to have a raised dome seems incorrect so not 10:1, I sent them an email to question this.

What do you guys think of this one? If the piston is exact 100.00 mm I would probably need to hone the cylinder. I'm planning to combine it with a head porting job. If people are interested I could post before and after dyno results.. when I find a dyno willing to operate in the weekends or evening that is . I'm running a 2005 XTX with stock ECU - should I be worried about knock with RON 95 or 98?

http://www.3pracing.com/en/wiseco-pi...0r-xt660x.html



I also found a CP one that was posted here before, but I didn't get a response from the shop so far:

http://www.gw-racing-parts.de/index2...is=2010&lan=en