So, as I recall the ignition was changed in 89, some had the smaller flywheel and some had the larger flywheel. They may haved changed the ignition curve in 92 but I don't recall physical component changes. as for the crank I've used from 88 on in newer motors. So to answer your question, No I would not have an issue with a pre 92 bike, keeping in mind that a pre 92 probably has more time on it than a post 92