Originally Posted by intimid8 (Post 3749318)

Hey..

The boat was purchased from the u.s.a and shipped over here. I have had no issues with her other than vapor lock.. no surprise considering our temperatures can get up to 120 degrees. What I find strange is that both motors are getting the exact same RPM's when pushed hard which is 4300 max when trimmed right. My gut feeling is that it's a prop issue or a gas issue since our octane is low. The engines are from 1995 and rebuilt in 2005 and have been ok so far so I do believe the previous owner was very honest with me.

I'll go over there tomorrow and take some pics of the boat when opening her up and you can be the judge.

Thanks and best regards,

Originally Posted by 4bus (Post 3749338)

120 degree air temps??? That might be your problem. Also what elevation are you at?

Originally Posted by 28Eliminator (Post 3749331)

When you go over tomorrow to look at it, take a look and maybe picts, at the numbers on the props and post those numbers. Also what elevation are you boating at, because that can make a big difference also.

Originally Posted by intimid8 (Post 3749707)

Gearing is 1.50 and props are 26 inch. Whats the best configuration for the boat?

Thanks

Originally Posted by BIGMC69 (Post 3751790)

I had the same problem with my Donzi. Trimmed out wot max rpms 4500. Ended up being weak fuel, the knock sensors retard the timing. I put octane boost in the fuel that was there and filled up with premium problem fixed back to 5 k both motors

Originally Posted by intimid8 (Post 3752831)

Thanks for the reply.. What octane booster did you use? what ratio should i use considering the tanks about 200 gal?

Thanks