I'm going to have the cylinder of my 2004 TT600RE motorcycle rebored (because it's damaged, not to increase power).
The manual says the piston size is 95mm and the compression ratio is 8.5 : 1.
I'm considering ebaying a 96mm Wiseco piston kit for this engine to save money, but it says the compression ratio is 11.5 : 1.
Does boring 1mm off the cylinder alone increase the compression ratio by that much? Am I looking at the wrong piston model?
Are there pistons that will give a similar compression ratio to the original? I'll be traveling in places with bad fuel (Africa) so this seems important. What are other considerations?
Edit: on the Wiseco website it lists two seemingly identical 96mm pistons for this bike, one with 11.5:1 compression and one with "STD" compression. However, both are 96mm and have a 84mm stroke. One is $184 and the other $196. Have no idea what accounts for the compression ratio difference, and assume from the answers that it must be a typo. Any other thoughts would be much appreciated.