On Tue, 17 May 2011 10:23:28 +0800, Fraser Johnston
I think he gets to about 8.5K on a motor that's redlined at 7.2K.
But has he taken it to 125% redline speed (RLS)? 26.8K.
I twice took a CB125S that's redlined at 9.5K though the red band and
1K back into the green at 12K (125%RLS). It was pulling so well at
that rpm in top it didn't slow down up a hill.
Doing the calcs for port size and valve timing, the max power speed of
a lot of engines will turn out to be higher than redline. Run them
into the red and lol and behold there is a power peak. There's a bloke
calls himself motoman with a site mototuneusa that advocates making
inlet ports smaller to bring the tuned rpm down within the redline
speed for proddy racing as they aren't allowed to mess with the
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