After all this discussion I think the best bike for the Manx would be a FZR400RRSP, but to increase reliability and performance it is better to tune it by having a leaky fork seal and a dodgy rear wheel bearing. This produces a good balance between the front and rear of the bikes suspension to soak up all the bumps on the course. Extensive testing also shows that this combination works especially well with a completely shot battery for that extra 10bhp on the downhill sections.