Yamaha 40hp performance?

[TheSaint]

Hey guys..

After finally taking a hand held gps with me the other day I did a few speed runs with my boat & had my 2004 yamaha 40hp 2 stroke 3cyl doing 54kph / 33mph / 29knots. The prop is 12 pitch & is in good condition but slightly worn. I believe i could get 55kph with a new prop & this seams to be the speed that i should expect from this motor?

My question is what speed are you guys getting from this motor?
What pitch prop are you running?
Ally or Stainless steel prop?
What boat hull?
Year of motor?

also any one running the yamaha 50 hp 2 stroke 3cyl - 50H could you add your figures?

My yammie is 40VWHTOL electric trim/tilt & electric start tiller - std ally 12 pitch prop
on 2004 Stacer 435 barra elite - 54kph

[tunaticer]

You need to state your boat model and loaded weight for some form of comparison to be made.
I have pulled those figures from my tinny before i decked it out with a 25 rude on the back.

[Chas & Clarry]

I look forward to letting you know when we switch our yammy onto our new boat when it arives (the new one has a GPS with speed...currunt one doesn't) in late january I hope :)

[TheSaint]

You need to state your boat model and loaded weight for some form of comparison to be made.
I have pulled those figures from my tinny before i decked it out with a 25 rude on the back.


I did..

My yammie is 40VWHTOL electric trim/tilt & electric start tiller - std ally 12 pitch prop
on 2004 Stacer 435 barra elite - 54kph


Only thing i didn't do was my loaded weight..

2 x full 24L tanks (50kg) & 2 people (180kg)..

Boat in standard form includes a full floor/ casting deck/ livewell / deepcycle battery..

http://www.google.com.au/imgres?q=stacer+435+barra+elite&hl=en&sa=X&biw=1366&bih=587&tbm=isch&prmd=imvns&tbnid=9xWFRQZbjh_7FM:&imgrefurl=http://www.stacer.com.au/site/stacer.com.au/filesystem/images/Boat%2520Images/2008/SF%2520Series/435%2520SF%2520Barra%2520Elite/&docid=rF2qCml3wXavVM&imgurl=http://www.stacer.com.au/site/stacer.com.au/filesystem/images/Boat%252520Images/2008/SF%252520Series/435%252520SF%252520Barra%252520Elite/435-Barra-Elite-OH.jpg&w=534&h=282&ei=pZf3Tor2IOS0iQfy5JTTAQ&zoom=1&iact=hc&vpx=731&vpy=155&dur=187&hovh=163&hovw=309&tx=181&ty=90&sig=116173990475549479650&page=1&tbnh=96&tbnw=181&start=0&ndsp=18&ved=1t:429,r:3,s:0

[patske]

I have an almost brand new stacer rampage 439 with 3cyl yammy and a stock ally prop and no power trim/tilt and my hds5 says I am getting 26kts. Getting the same speed solo or fully loaded. Looking to change props as I was wanting at least 30kts, just want to find that happy medium between good speed and fuel economy.

[Shawn 66]

I look forward to letting you know when we switch our yammy onto our new boat when it arives (the new one has a GPS with speed...currunt one doesn't) in late january I hope :)

Which one did you end up going with Tim .Whichever one you decided on I hope it brings you and Trace a lot of enjoyment . Shawn

[robvee]

I have a Brooker Seaman 450 with the 2009 40hp Yammie tiller steer, manual start, standard prop.
+/- 200kg load and against the tide on the Tweed I got 54km/h (only 1 time I've ever tested top speed)
So my guess is without a change to the prop - thats the max we'll get from it.
But I am more than happy with the performance vs economy I get with this setup ... GREAT motor :-*

[Chas & Clarry]

Which one did you end up going with Tim .Whichever one you decided on I hope it brings you and Trace a lot of enjoyment . Shawn

The TABS Bullshark, started a thread saying we ordered it earlier today. Will update progress there...can't wait to speed test it, I've never had any idea what speed the yammy 40 does in the old Abolone and I guess we will never know now.

[TheSaint]

The TABS Bullshark, started a thread saying we ordered it earlier today. Will update progress there...can't wait to speed test it, I've never had any idea what speed the yammy 40 does in the old Abolone and I guess we will never know now.


Hopefully this thread gets a good response & All yamaha 40hp 2 stroke owners will get good idea what this motor can & can't do..

[Moonlighter]

Hi Saint

Top speed isn't by any means, everything.

The single most important thing is that your engine hits close to it's max recommended rpm when you are flat chat. I just had a look at the Yamaha website and the 2 stoke 40 VETOL recommended rev range is 5000-5500, so you'd want to be getting around 5300rpm flat out.

Why?

Because outboards have only 1 forward gear, and you must select a prop that gets you near max rpm otherwise you will be laboring the engine, and also because if you select too big a prop, your hole shot ie acceleration onto the plane, will be poor. And an engine that is laboring is very bad for outboards and is the cause of more premature, catastrophic failures than just about anything else.

You probably don't have a tachometer on your boat, but see if you can borrow one from someone and check your max rpm and see how it compares with the factory recommended range.

Then start playing with props if you need to. After you check your engine height, of course.

For what it's worth, I had a Yammy 30 some years ago on a Quintrex Seaman 14.5 footer, and got about 45 km/ hr.
Cheers

ML

[TheSaint]

Hi Saint

Top speed isn't by any means, everything.

The single most important thing is that your engine hits close to it's max recommended rpm when you are flat chat. I just had a look at the Yamaha website and the 2 stoke 40 VETOL recommended rev range is 5000-5500, so you'd want to be getting around 5300rpm flat out.

You probably don't have a tachometer on your boat, but see if you can borrow one from someone and check your max rpm and see how it compares with the factory recommended range.


Top end isn't everthing.. too someone people but if you want to run & gun a few spots it comes in quite handy.


Your on the money with saying I don't have a Tacho, this is true. I plan to fit a digital one next service (5 months) until then i'm stuck with going off gps speed but I do believe my boat is set up right with standard 12" pitch prop & motor height. The boat comes out of the hole ok, pulls well thru the rev range all the way to WOT. Cruises well also when i drive nicely..

[Giveitacrack]

Seajay escape 435,2005 Yamaha 3cyl 2 stroke,standard prop,60 litre full fuel tank,40 litre live well,minn kota riptide,115amh trojan deep cycle battery,house battery,a full plano 777 tacklebox plus me @110kg+=48 kmh.I lose about 2- 4kmh with my 110kg+ mate.I had all the floors up,minn kota off,battery out, and tank out for mods and acheived 56 kmh on a couple of runs with a tote tank.Seajays are built heavy duty below the floor making them heavy for there size.

[Chas & Clarry]

Hi Saint

...The single most important thing is that your engine hits close to it's max recommended rpm when you are flat chat. I just had a look at the Yamaha website and the 2 stoke 40 VETOL recommended rev range is 5000-5500, so you'd want to be getting around 5300rpm flat out....

ML

Hmmmmm, got out on the Pine today, maxed out at a consistent 5000rpm. Will have to get some advice when I get the Yammy switched over to the new boat.

[Mike Delisser]

I had the same motor as you on my 4mt Edge Trakker (best 2st I've ever owned), top speeds (gps) I ever got to were 53km in the salt and 51km fresh. With 2 onboard I only lost a couple of k's. I'm not sure but I think I had a 13" prop but like I said I can't be sure. Before I bought the 40hp I had a Yammy 20hp 2st and it still managed 45km with just myself onboard but dropped to 30km 2 up.
Cheers
Mike D

[Richo1]

"After finally taking a hand held gps with me the other day I did a few speed runs with my boat & had my 2004 yamaha 40hp 2 stroke 3cyl doing 54kph / 33mph / 29knots. The prop is 12 pitch & is in good condition but slightly worn. I believe i could get 55kph with a new prop & this seams to be the speed that i should expect from this motor?"

If my new Tinny can get do 29knots I'll be stoked, although I went for 40Hp 4 stroke on a Clarke 427 pursuit, so will it will be interesting to compare it with your 2 stroke figures.
Is the expense of a new prop worth an extra 1kph? I reached a stage with my Quintrex explorer where I wanted more speed and tried new props, foils etc only to be disapointed with the results. After that I realised that I just needed to buy a bigger boat & motor!

Cheers
Richo

[marty+jojo]

4.2mtr Bluefin Mangrove Jack, Minn Kota, deep cycle battery, 25ltr fuel tank, me 85kg, tackle bag 15kg, 2003 Yammy 2 stroke 3 cyl,
53km/hr fast enough for me.
Marty.

[TheSaint]

Is the expense of a new prop worth an extra 1kph?

It's not but i need to get a spare one just in case..

[Aussie123]

Currently I have a 4.4m Stacer EVO hull with a 40hp 3cyl Tohatsu.
She is fully decked out with casting decks,2 x minn kotas, 3 large deep cycle batteries,2 x underfloor tote tanks (50L),alloy side consoles ect and with 3 guys fully loaded up with gear and fuel on freshwater i was getting 44 kmh on the GPS.
I have no idea on rpm yet until I somehow fit a temporary tacho to test things out.
I was quite happy with the performance considering one of the guys was probably equal to 1.5 pob.

[Chas & Clarry]

Originally Posted by Moonlighter http://www.ausfish.com.au/vforum/images/buttons/viewpost-right.png (http://www.ausfish.com.au/vforum/showthread.php?p=1338470#post1338470)
Hi Saint

...The single most important thing is that your engine hits close to it's max recommended rpm when you are flat chat. I just had a look at the Yamaha website and the 2 stoke 40 VETOL recommended rev range is 5000-5500, so you'd want to be getting around 5300rpm flat out....

ML


Hmmmmm, got out on the Pine today, maxed out at a consistent 5000rpm. Will have to get some advice when I get the Yammy switched over to the new boat.

Got the new boat onto the water for the first time today. Told Keith from Motors Sport Marine about the issue with lowish max rpm, and he switched the 12 pitch prop for an 11 pitch. Got 5300 rpm at WOT today for 51kph loaded with Trace + me + fill live well plus gear. Will test it one-up tomorrow with an empty live well (though hope to have to fill the live well pretty early in the day :) to see if it gets any higher, but I am happy with that.

[Chamelion]

I used to have a 1995 3cyl 2 stroke 50hp on the back of my 4.4m fibreglass boat. Top speed was about 52-54km/h, though the boat plowed quite a bit. I could get 48km/h and use a lot less fuel.