its no where near ideal and I'm sure I'm going to get reamed by everyone for saying it, but in the near year I've had my 95 I've never done a topend rebuild. It still has oodles of power, tons of compression and starts on the first kick every time( i kick it over slowly once or twice to prime it) and for those reasons I don't see an immediate need to replace my topend. On the other hand, I have replaced my fork seals after they ever so blatantly shat there oil all over the garage floor one night. and I have changed my chain and sprockets and repacked my headset bearings, and yada yada yada normal maintenance but as for the topend, why fix it if it ain't broke?(or showing signs that it may be broke soon) did that make sense?
.02$