I didn't even know there were different size ring gears for the Rotax.
I can already find parts, I just don't know if they will fit what I have.Again go to the swap meets and find the parts you need
I would too but social security doesn't leave enough money at the end of the month.I have sent them over sized pistons and they can bore it and replate it over sized!
I have had a 580 bored out to 625? or so
Comes back even better than new!