Suzuki DF60A Throttle body.. Is this fully open when in WOT???

[Gaha]

I have Suzuki DF60A 2022 on 17ft fiberglass fishing boat which weighs around 1,100 that struggles to get on plane with full tank of gas (20 Gallons), a cooler with ice, and two adults weighing close to 200lbs each. I have adjusted the engine mounting two holes up with a slight improvement. Someone recommended to try a different pitch prop, which is on order. Today, I decided to verify if my throttle body is fully open when in WOT. I noticed that it still had about 20% before it is fully engage to top pillar.

The first picture is throttle body in Neutral while the second one is in WOT on top mount binnacle.
Note that there is still some clearance to upper pillar. The video confirms that it can move further up after removing the cable.

Is my assumption correct or it should have that clearance? If so, it may be one of the reason why boat struggles to get on plane as it is not fully open?

Any help is greatly appreciated!

 

[dingbat]

I have Suzuki DF60A 2022 on 17ft fiberglass fishing boat which weighs around 1,100 that struggles to get on plane with full tank of gas (20 Gallons), a cooler with ice, and two adults weighing close to 200lbs each. I have adjusted the engine mounting two holes up with a slight improvement. Someone recommended to try a different pitch prop, which is on order. Today, I decided to verify if my throttle body is fully open when in WOT. I noticed that it still had about 20% before it is fully engage to top pillar.

The first picture is throttle body in Neutral while the second one is in WOT on top mount binnacle.
Note that there is still some clearance to upper pillar. The video confirms that it can move further up after removing the cable.

Is my assumption correct or it should have that clearance? If so, it may be one of the reason why boat struggles to get on plane as it is not fully open?

Any help is greatly appreciated!

Means nothing….is the butterfly valve fully open?

That’s a heck of a load for a 60 hp motor…. Last 17’ boat I was on had a 115hp on the transom

 

[racerone]

How did it run for you last season ?---What happened ?

 

[99yam40]

Means nothing….is the butterfly valve fully open?

That’s a heck of a load for a 60 hp motor…. Last 17’ boat I was on had a 115hp on the transom

I agree, what HP motor is the boat rated for?
what prop are you running?
is the trim set all the way down when trying to get on plane?

 

[Gaha]

Means nothing….is the butterfly valve fully open?

That’s a heck of a load for a 60 hp motor…. Last 17’ boat I was on had a 115hp on the transom

Yes I agree, boat feels sluggish. I'm not sure if the butterfly is fully open, as I am just inspecting visually from what I can see. Based on position of throttle body on WOT, there is still some leeway for the butterfly to swing a bit more. Just wondering if someone who has a suzuki motor can compare how far the WOT is on there side.

 

[Gaha]

How did it run for you last season ?---What happened ?

It was pretty much the same, no change just worked with what I had. A mechanic suggested to try and adjust the mounting hole as it was originally sitting a bit low below the transom from the factory. Another suggestion was a prop with a lower pitch. I'll be testing the prop soon when it arrives.

 

[Gaha]

I agree, what HP motor is the boat rated for?
what prop are you running?
is the trim set all the way down when trying to get on plane?

It was rated for 40-60hp. The prop size is an 11.6x14 and trim set all the way down and slowly move up as I pick up speed. The boat can plane when I'm alone or after a long day fishing with another person when most of the gas and ice melted. Top end speed with two person as in low 20's.

 

[99yam40]

It was rated for 40-60hp. The prop size is an 11.6x14 and trim set all the way down and slowly move up as I pick up speed. The boat can plane when I'm alone or after a long day fishing with another person when most of the gas and ice melted. Top end speed with two person as in low 20's.

what RPM is the motor hitting at WOT with one person and with 2

Here is a performance bulletin for a F60Yamaha, I guess it would be similar.

F60LB on Smoker Craft Pro Angler 162 Performance - Yamaha Outboards

Find detailed specs and performance information for the Yamaha F60LB outboard motor paired with a Smoker Craft Pro Angler 162 boat.

yamahaoutboards.com

 

[Gaha]

what RPM is the motor hitting at WOT with one person and with 2

Here is a performance bulletin for a F60Yamaha, I guess it would be similar.

F60LB on Smoker Craft Pro Angler 162 Performance - Yamaha Outboards

Find detailed specs and performance information for the Yamaha F60LB outboard motor paired with a Smoker Craft Pro Angler 162 boat.

yamahaoutboards.com

I can get to about 6000 rpm alone, but this was a run I did once. most I got on two person with gears and half tank of gas is 5300-5500 at a speed of 20-23 MPH. 4 people no gear, just cooler with drinks, ice and some food, it will not hit 5000.

 

[dingbat]

I can get to about 6000 rpm alone, but this was a run I did once. most I got on two person with gears and half tank of gas is 5300-5500 at a speed of 20-23 MPH. 4 people no gear, just cooler with drinks, ice and some food, it will not hit 5000.

If that is the case you are way over propped. Should be able to get closed to 6,000 with your “typical” load

 

[Gaha]

I can get to about 6000 rpm alone, but this was a run I did once. most I got on two person with gears and half tank of gas is 5300-5500 at a speed of 20-23 MPH. 4 people no gear, just cooler with drinks, ice and some food, it will not hit 5000.

If that is the case you are way over propped. Should be able to get closed to 6,000 with your “typical” load

Yes i absolutely agree. I ordered a Solas 11.6x12 to see if there’s an improvement.. I’m also looking at getting a 4 prop to test, heard they plane easier and lift the stern.

 

[dingbat]

Yes i absolutely agree. I ordered a Solas 11.6x12 to see if there’s an improvement..

The 2” drop in pitch will get you roughly 200 rpm

I’m also looking at getting a 4 prop to test, heard they plane easier and lift the stern.

Four blades are great for pushing or pulling lots of weight at reduced speeds and reducing “blow outs” when running in slope.

Problem being, they waste a lot of HP due to their inefficiently at the top end. The last thing you want to do is put a 4 blade on an under powered or overloaded boat.

 

[99yam40]

I thought it was 200RPM per " of prop pitch change.

he said the boat is rated for a 40 to 60 hp motor, so it should not be overloaded if the motor is running properly.
the PB I posted for a 60HP Yamaha is kind of confusing sence it ways 60 but also says 70, but even on that 16' it called for a smaller diameter prop and lower pitch.

 

[Gaha]

I thought it was 200RPM per " of prop pitch change.

he said the boat is rated for a 40 to 60 hp motor, so it should not be overloaded if the motor is running properly.
the PB I posted for a 60HP Yamaha is kind of confusing sence it ways 60 but also says 70, but even on that 16' it called for a smaller diameter prop and lower pitch.

Yeah, that's what I was thought as well. In theory anywhere between 300-400RPM.

Here's a performance test from Suzuki DF60A on Caravelle boat that weights over 1500lbs, with a bigger pitch 15. This is confusing as my boat weighs about the same loaded on a 14 pitch and struggles to get on plane.

Caravelle 17 EBO - Suzuki Marine USA, LLC

See boat test results for Suzuki Marine outboard engines. Boat manufacturer: Caravelle - Model: 17 EBO - Outboard: Suzuki DF60A

www.suzukimarine.com

Now this make me wonder if my Throttle body is fully engage when at WOT.

Is there anyone with a Suzuki engine who can look at how far there WOT on their engine?

 

[Gaha]

The 2” drop in pitch will get you roughly 200 rpm

Four blades are great for pushing or pulling lots of weight at reduced speeds and reducing “blow outs” when running in slope.

Problem being, they waste a lot of HP due to their inefficiently at the top end. The last thing you want to do is put a 4 blade on an under powered or overloaded boat.

I don't mind loosing a couple of mph at top end, if I can get the boat on plane easier at lower rpm. Maybe a smaller diameter and 11 pitch prop might work better for my case when switching to 4 blades....

 

[99yam40]

Yeah, that's what I was thought as well. In theory anywhere between 300-400RPM.

Here's a performance test from Suzuki DF60A on Caravelle boat that weights over 1500lbs, with a bigger pitch 15. This is confusing as my boat weighs about the same loaded on a 14 pitch and struggles to get on plane.

Caravelle 17 EBO - Suzuki Marine USA, LLC

See boat test results for Suzuki Marine outboard engines. Boat manufacturer: Caravelle - Model: 17 EBO - Outboard: Suzuki DF60A

www.suzukimarine.com

Now this make me wonder if my Throttle body is fully engage when at WOT.

Is there anyone with a Suzuki engine who can look at how far there WOT on their engine?

I would test what you can to make sure the motor is hitting well on all cylinders.
the basics
Good Compression and spark,
and proper timing and advancement should be easy to test

fuel rail pressure also
if all is good then maybe cleaning and testing the injectors

 

[lakensea]

Since it's a fairly new engine, why are you even fussing with it. It is the installing dealer's responsibility to set/confirm the WOT, and make sure the engine is propped correctly. You should have signed and received a PDI (Pre Delivery Inspection) form from the dealer confirming both of these.

 

[Gaha]

Since it's a fairly new engine, why are you even fussing with it. It is the installing dealer's responsibility to set/confirm the WOT, and make sure the engine is propped correctly. You should have signed and received a PDI (Pre Delivery Inspection) form from the dealer confirming both of these.

Unfortunately, I live on an small island and don't have a lot of options. I bought the boat from a manufacturer and bundled the engine based on their HP specs. I wanted a Yamaha 60hp because we have a dealership here, however at that time they didn't have any available. I went with a Suzuki with the knowledge knowing that I don't have a dealership here. Hence why I am trying to get help here on the forum.

 

[99yam40]

Sorry I did not pay attention to it being a new boat and motor,
but I would still be contacting the ones that sold it to you to see what they say this rig should be able to do.