1989 110hp seems slow

[Bgolpmp]

Thanks for reading. I have a 1989 stratos 269v glass boat with a 89 johnson 110hp on it. Top speed I get out of it is 33 mph. Does that seem correct? It has a 15 pitch 4 blade prop and does around 5500 rpm. The boat came with a 19 pitch prop but I had problems with planning out. With the 19 pitch i would get 36 mph but was only getting around 4700 rpm if I remember correctly I was out last night with my 5 year old son and the boat was cavitating. When I purchased the boat this summer the old owner had the motor tilt stop (I have no clue what it is called) up 2 notches I moved it down 1 notch and it got a bit better and totally removed it and a bit better but still happens could the motor be at the wrong height on the transom?

Thanks for reading!

Andy

[suzukidave]

with a 15 inch pitch prop 33mph at 5500 rpm sounds close to right for a 4 blade prop. maybe 3-4 mph slow of what i would expect is your potential max. is that gps?

you might go faster by raising the motor and reducing hull slip, but i am not the guy to tell you how to do that.

you were overrpropped with the 19" pitch. if you get to 5500 easily with a 15" you might find a 17" pitch works for you and drives the boat faster but personally on an older motor like that i'd rather be slightly underpropped and work the motor less hard and jump on plane.

[omcforever]

Thanks for reading. I have a 1989 stratos 269v glass boat with a 89 johnson 110hp on it. Top speed I get out of it is 33 mph. Does that seem correct? It has a 15 pitch 4 blade prop and does around 5500 rpm. The boat came with a 19 pitch prop but I had problems with planning out. With the 19 pitch i would get 36 mph but was only getting around 4700 rpm if I remember correctly I was out last night with my 5 year old son and the boat was cavitating. When I purchased the boat this summer the old owner had the motor tilt stop (I have no clue what it is called) up 2 notches I moved it down 1 notch and it got a bit better and totally removed it and a bit better but still happens could the motor be at the wrong height on the transom?

Thanks for reading!

Andy

Check the basics,,compression check,,link and sync and insure linkage is working properly(timing advance-carbs 100% open. Check prop to pad distance. A good OMC (not Clymer or Seloc) manual will guide you. That thing should be on the limiter with a 15 pitch prop and small boat. Should run mid 40's at 5500 rpms or so and easily swing a 19 pitch prop. Are you familiar on how to properly trim a motor from the hole thru WOT? Is there a jackplate on the motor/boat?

[omcforever]

Also you didn't mention you thought the rear was too heavy(Stratos forum). Check for water saturated hull and too much weight in the rear. Like I said above,, check basics before throwing props at it.

[bpicinc]

Thanks for reading. I have a 1989 stratos 269v glass boat with a 89 johnson 110hp on it. Top speed I get out of it is 33 mph. Does that seem correct? It has a 15 pitch 4 blade prop and does around 5500 rpm. The boat came with a 19 pitch prop but I had problems with planning out. With the 19 pitch i would get 36 mph but was only getting around 4700 rpm if I remember correctly I was out last night with my 5 year old son and the boat was cavitating. When I purchased the boat this summer the old owner had the motor tilt stop (I have no clue what it is called) up 2 notches I moved it down 1 notch and it got a bit better and totally removed it and a bit better but still happens could the motor be at the wrong height on the transom?

Thanks for reading!

Andy

Check compression, is it getting full throttle? 1989 may be getting tired! LOL

[Bgolpmp]

Motor getting tired? I think it isn't broken in yet lol. The 33 mph is gps and also when I go full throttle the motor trims down all the way. Is that normal? I honestly can't I have ever tried to trim it up when I was going wide open but I will try it out

I will sweet talk the wife maybe I can go again tonight

Thanks for the replies

[omcforever]

Check compression, is it getting full throttle? 1989 may be getting tired! LOL

Think that was already asked/suggested...post # 3 and #4

[Bgolpmp]

Also as far as a saturated hill how do I check that? The back has 3 batteries and the fuel tank. I also sit pretty far back. No weight in the front of the boat.

[omcforever]

Motor getting tired? I think it isn't broken in yet lol. The 33 mph is gps and also when I go full throttle the motor trims down all the way. Is that normal? I honestly can't I have ever tried to trim it up when I was going wide open but I will try it out I will sweet talk the wife maybe I can go again tonightThanks for the replies

Got it backwards,,needs to trim up while you are gaining speed...if not, it will dig into the water and be slow,,,find the boats sweet spot. good speed,, good rpms and good water pressure and no prop blowout.

[omcforever]

Also as far as a saturated hill how do I check that? The back has 3 batteries and the fuel tank. I also sit pretty far back. No weight in the front of the boat.

Remove batteries and possibly fuel tank and drill some small hole(not thru the hull) just into the flotation foam and if the bits are wet or get weepage,,,wet hull and foam.

[Bgolpmp]

Ok thanks for the info i will give it a try. What do I do if it is wet?

[ChampioNman]

Ok thanks for the info i will give it a try. What do I do if it is wet?

Pull the top cap and remove the wet foam.