SOHC.co.uk Forums > CB350/400

Might have to repaint the red zone on the tach...

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Mikep328:
"Mmmm. 12000rpm without any ill effects. How do you know? I’d be more concerned about the potential stress damage you can’t see without a granular, detailed check. Consider going to 12000 again for about 5 seconds and let us know how you get on?"

 I wasn't suggesting that going to 12k was a good idea, just that the occasional missed shift at full throttle won't blow up the motor! 

Oddjob:
I don’t think for a second Mike that you were advocating revving one to 12000. Plus I don’t think the rev zone goes up to 12k even past the red zone, maybe 11k, been a while since I looked.

You should also bear in mind this mechanic is used to working on race bikes, not street bikes. As such they’ll have race cams, different valve springs, different compression ratios etc. They’ll rev to 12k quite safely, probably 14k.

A few missed gear changes won’t hurt an engine unless you hold it there, a few minutes running in the red most likely won’t either, I did that a lot when I was racing. As the years go by and all the internals age, then like our bodies I’d take it easier on it rather than the other way around.

Sesman:
I know, just my mischievous sense of humour🫢

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