Thanks for the advice Peter, I’m wonder how much does it cost you in parts/labor to do that maintenance every end of season.
I was looking at this website http://www.accelerationkarting.com/rotaxrebuildrates.aspx on which the pricing doesn’t look bad for a rebuild (top). I read in this forum that Rotax recommends a top end rebuild every 50hrs? is that true?. that sounds like a lot! comparing to my CR80 or even a 125. which I normally do every 4-5 hrs. (I could wait more, but I don’t like to risk the whole engine just to put a few more hrs. on it).