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Previous PostTech Posts > Performance Tips & Tricks > Arrow lowboy on a 955 Daytona ?
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Chococat
The drugs do work.,
United Kingdom

Premier Member
Posts: 38891
Street Triple R


23 Nov 2016 22:01
kev55daytona:
I wonder if that's what the EXUP valves do? Give you a longer primary at low revs for better low down power and then shorten them at high revs to give more top end?


https://en.m.wikipedia.org/wiki/Four-str... valves on modern bikes

That's the theory of the original Yamaha EXUP valve. Exhaust valves on modern bikes are purely to fudge noise testing - remove them and you get power gains.
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Previous PostTech Posts > Performance Tips & Tricks > Arrow lowboy on a 955 Daytona ?
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