I was wondering if anyone on this forum has turned their CR/YZ/RM/KX 250 into a big bore (for example 275cc or 285cc).
I would like to know the results of that operation? I am an expert level rider and have an '01 CR250 that I am considering doing this to. It is already built and very fast on top, so my goal us to beef up the low end, add some to the mid-range, and just a touch to the top end, thus broadening the powerband. I think anything more might actually make the bike too much to handle on the MX track.
If you have done this, please share you experiences, likes, and dislikes.
Thanks & regards!