Hey there. I know this is a bit like 'how long is a piece of string', but what would be an average lifespan for the RVF400 engine. Assuming its been reasonably well looked after, how many kilometers before a rebuild is getting due. 100K, 150K etc?? How many miles is too many for a second hand one of these. Ive done a bit of searching about, and most people are pretty happy with theirs, and have said they don't tend to have any major faults, but I'd be very interested to hear what everyone has to say. Thanks.