Originally Posted by Nos4r2
Bear in mind the max recommended operating rpm for a Yam 90 2 stroke is 5500 rpm. I hit 5500 RPM with a 17k on the 85 Yam/SR5.4 (same motor bar premix)
Does anybody know where the RPM-limiter comes into play on a Yamaha 90 ? Some people say 6000, others 5800 rpm.
One ex. racer told me that you should aim for 5800 rpm for the 90 AETO.
My top rpm at WOT so far is 5700. The prop was a Solas Titan SS 13 1/4 x 17 and the rib is an SR 4.7. Topspeed 40,5 knots. The Avon does 42 - 43 knots with the 12 5/8 x 21 alu at 5200 - 5300 rpm so the search goes on.
Still testing for the perfekt prop...