2320 low speed problem

[lynntoedte]

I recently bought a 2000 2320 with a 200 Yamaha 4 stroke. I have had a number of boats but never this problem. At 4200 to 4400, I can only get 15 mph. I changed props and had the engine checked - no change. I am running 30 gallons of fuel with 400 lbs of people weight, a 110lb kicker and 250 lbs of boating junk. Anyone know what I can do to get more mph without going to 300 hp?

 

[Brent]

What is your max rpm? which hole is motor mounted?

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[Brent]

Prop size?

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[lynntoedte]

Outboard motor is mounted in 3rd hole from top. Max rpm is approx 5700.

 

[lynntoedte]

Prop size is 3 blade 14 1/2 x 17

 

[Brent]

you should be getting 30 mph. Is your prop slipping?

 

[Brent]

When your max RPM is 5700, what speed are you going there?

You changed, props, what prop did you have first, and what prop did you which to ?
If you know the brand/model/size that would be helpful.
aluminum or stainless.

Is this the 6 cylinder yamaha F200, or the new 4 cylinder 4 stroke?

Is the bottom of the boat clean, no growth at all?

Also might check to make sure there is nothing mounted on the hull inline with the prop, like a water pickup, or a transducer or anything.

Call or email anytime
Ken Reeves
[email protected]
941 735 5808

 

[MadGar]

Well, just for reference, I run a 200 2stroke johnson and 200 is just not enough motor but not as bad as the numbers your stating. My motor is about 100 lbs lighter but I have kicker like you too. My setup is probably one of the closest to yours you'll find because most 2320 run 225 and up. I can cruise at 4200 about 26mph and WOT is about 35 at 5800. Now my motor is on a jack plate and I can raise and lower easily to find optimal. You numbers however, would lead me to believe you probably are having a slippage issue. I am sure some others will chime in more knowledgeable than me but I agree, there is something way wrong.