REV LIMITER ?? @ what rpm??

[2000DONZ]

Have a question for anyone that can help,
I have a friend that has just bought a used 2000 Donzi 20 foot with a 350 TBI motor and @ 5400 RPM the motor cuts out then back, out then back as though it has a rev-limiter in it , if so can that be adjusted and by whom ?, the boat runs great to that point, tops out at 53-57 mph on the speedo, comes out of the hole just fine.

Looking for help ,

Thanks Mike

[maddad]

Mike, you should use a bigger prop to lower the rpm. If you let everyone know the propsize on it now they can suggest a new size.

[CHACHI]

Mike, you are not trimming the lower unit too high are you?

Ken

[CHACHI]

There shold be a tag on the engine that has the RPM range of the motor.

Ken

[RedDog]

what is a "2000 Donzi 20 foot"? I can't place that model

[BUIZILLA]

Z20 ?

[2000DONZ]

Sorry took so long to reply,

Prop is a 23 pitch
model is a Z20
don't know the rpm limits can't find the tag
don't believe it trimmed to high, no sign of a rooster tail developing ?

Thanks Mike

[MOP]

Try to borrow a 23 four blade and a 25 three blade, the four blade should take about 200 off the top and the 25 should take about 400. I think the three blade will give the best speed but the four blade may be better for all around usage, it all goes back to testing all boats react different!

Phil