I ran a 125 shot, the only problem was one time I missed a shift and had a large backfire. That cost me a head gasket and later I found out I lifted a ringland. It was 100% my fault I am in no way saying n2o did it. I did not hook up my window switch as it was on order threw a local shop.
1st thing you should do is hook a window switch up WITH your kit. I was lucky for a long while and knew the risk that is why I orderd the switch just crappy timeing and my stupid fault. Using n2o correctly is totaly safe and one heeeelllllllllll of a ride.
n2o gives you a funny smile that takes a few days to take off after the first hit.