hi guys ,regarding the problem i had with this engine,i am happy to say that i have resolved it , i decided to strip it down,and have a look, the rings were gone, the end gap was huge, the bore was really good, i sourced a set of rings (56.5MM) and a couple of valve stem seals,a lower gasket, put it all back together(a snack), hooked it back to the bike, 4 kicks later, and away it went, no dramas at all, so thank yous all , for replying to my post. that project is now out of the way, i am going to start rebuilding a xr200. it will be a bit harder, being a ohc engine, where as the one i just done is a pushrod engine, total cost for that engine rebuild was $60,thanks again cheers WAZZA