x2 on even then up. Lose the limiter, send it to repair or get a Brucato acu with a 7500+ rpm limiter. I do over 90 all the time with a 26 to 28 inch prop in a GS. You'll be over 100 with a 30+ pitch light load 1/4 to 1/2 above with no limiter. I would run a 26 or 27 with your setup with no limiter. A 26 or 27 would be a very quick ride to 90,s.
If your running a promax over 7300 rpm don't be cheep on oil, I always go 40-1 and if your holding it longer than 30 sec above 90 I add a splash more oil. Also aces is a good idea to mix in also. I would also send your heads in to get a little more grunt. Mine are 33cc but 34cc would be good for were you live. Thats the best less than 200 you'll spend.
Is your cowl aftermarket or stock factory? If a bobs for instance you need to add bigger holes as they are to restrictive. The stock cowls are designed to move the air flow toward the intake, the bobs have no deflector so bigger and more holes solves this.
Every prop is different were it will like to run best. 1/4 below and up. Personally I think a 30 pitch is to high of pitch for a 225 for anything other than a light load long distance running to save fuel. But even that would be debatable over a 28 with a promax in fresh water. A 26-27,28, pitch will get you well over 90 7400 rpm or less. A 28 at 7400 rpm will get you right around 98- 100. For a 30 to get you into upper 90,s to 100+ youll need to free up the prop a great deal and be running very very high as the motor will have a harder time getting the rpm turning such a big wheel. A 30 is a real dog and very hard on the motor and gear case I feel personally. I think its better for the motor and gear case to run smaller pitch props at a higher rpm than larger pitch props at a lower rpm.
Dont get me wrong there is a place for a 30 but theres more places for smaller pitch props. When theres boats on the lake its hard to beat a stout 26. When the window of opportunity is small and you have a higher rpm motor you can make a blast to 90 and back off in a much shorter time and area than a 30 would allow as an example.
