Does a 1990 rm 125 cylinder fit a 1988 rm 125?

No, the 1990 RM cylinder doesn't fit the 1988 cylinder. The 1988 cylinder is the only year that'll fit on a 1988 motor. This was the first year Suzuki did that. It actually sucks because I have a 1988 RM 125 I've been trying to get a cylinder for. And the 1988 cylinder is the only match. Nothing else would fit.