Probably cuts out for a couple of reasons;
1)Nothing to be gained in power for revving beyond 8,000 rpms
2)Cast pistons and rods aren't designed to handle much more than 8,000 rpms.
FWIW, Jojje, that mad turbo Swede
, concurs about point #2. Well, close to that anyway. For stock Bonnevilles, I believe he's adjusting rev limiters to something like 8400 rpm. Since those bikes have a stock limit of 7400 rpm, that's a substantial gain. With the Speedmasters having a 7,900 rpm rev limit, there's little to be gained by a 500 rpm increase.
Now if you're talking Wiseco big bore with forged pistons, and maybe some Carillo rods, then the talked about 9,000 rpm rev limiter could be doable. I wonder what RCV thinks about this cast piston/rod durability with his in-the-works higher rev limiter?
I know Jojje also has said that he can't really make the 270 motors have a higher rev limit, but I'm not sure why he said that is. Maybe a search over at Triumphrat.net will give the answer. I seem to recall a post that said when the 270 gets into the high rpms, it could have a problem maintaining it's consistant firing sequence, but I could be wrong.
