Would like Yamaha user feedback... for new owner

M

Montana Kev

New member
I have a 2000 Yamaha 40 HP 4 stroke and a 2006 4 HP 4 stroke. Both are new to me. Just wanted to see if there is any general feedback among Yamaha users about their experience with this brand. Do's, don'ts or quirks specific to the Yamaha brand.

Thanks,
Kevin
 
The F75 Yamaha I had on the Jenny B always ran flawlessly. It is a fuel injected version (one of the first manufactured in that horsepower) Never worried about gas in the carbs - go away for a month, charge the fuel line and it started within seconds. Every time. I did put a Racor 10 micron filter in the fuel line from tank to engine but never saw a drop of water in the filter bowl. One great feature is the flush line hose connection up near the cowl. Connect the hose to a fresh water line to flush is easy plus if you connect a short hose to the engine connector and put a shower head on the other end you can sit on the swim step and take a nice warm shower.

Don
 
I have run Yamaha's for the last 10 years, never a problem.
I have run others in the past and can't say the same. Far as I'm concerned you can't buy a better motor.
Big Dave
Raven Dancer.
 
I have two 150s on the Lori Ann and they have worked well and have been reliable. However, the performance seems to be under what others are getting with their Suzuki's. This may well be a prop issue, though.

I have heard that Yamaha is the engine of choice in northern BC, which is good if I need service up there.

Warren
 
Kevin,

We run twin 40 Yamaha's, carb'd and like them. This is our first experience with a power boat so don't have much to base that on. I do like the twins. I did have some carb issues last spring and "suffered" a rebuild on both engines. Seem to be working well since then, some idle shake beginning to appear. I run Yamaha RingFree about every other tank full, and also Stabil, and not the marine version of that.

I would be interested in what you are running for props. I have mentioned mine here and there and and told I could get some improved speed by doing some prop work. (WOT is about 5200, max speed about 20 knots.)

We have had excellent starting, and reliable running and I like that. Another reason for enjoying the twins.

Enjoy and wish you the best,

Harvey
SleepyC :moon
 
Kevin,

I know there is another boat out there with twin 40's. Just can't remember now. If I bring this back up maybe they will see it this time.

Still curious about what props you are running. Thanks.

Harvey
SleepyC
 
Have had about eight including 4 now. A 4 stroke 40 is among them. Have never had a problem of any type
 
Big dave":2qzsoxh1 said:
I have run Yamaha's for the last 10 years, never a problem.
I have run others in the past and can't say the same. Far as I'm concerned you can't buy a better motor.
Big Dave
Raven Dancer.
Click to expand...


X 2 :thup :wink:
 
I have twin 40 Yamaha's 2003 year.....with carbs.....and I truly HATE them !! They are the worst motors I have ever owned.... did not run well when they were new... I took them back and they tuned them ....again ..hard starting...dying...miserable motors... I did fix several air leaks in the fuel system that helped the dying....but they still are very hard starting.... first start requires...3 to 5 minutes of cranking..(honest)... then they idle ratty until warm...if they are not warm...they will die under load.. I now have almost 300 hours on them... have had several "experts" tune them....without any improvement...

Joel
SEA3PO
 
When those miserable beasts were new the WOT was 5200 now WOT is 4700....(probably one of the experts did this to me)

Joel
SEA3PO
 
The one issue our shop has seen, and this has been with all carb'd engines, is fuel quality issues.

Be sure you are running a good fuel / water seperator. Change it annually. We are recomending the new marine formula Sta-Bil. It is blue, and pricier than the red, but it has no alcohol in it so will not absorb water. It is supposed to help prevent phase seperation that occurs when the alcohol in today's fuel absorbs so much moisture that it sperates from the fuel.

Once this happens, you have a mess. The other issue is the alcohol moisture that can happen in the carb itself. This causes corrosion of the aluminum housing and runability problems. Carbs on these engines are expensive.

Sta-Bil recomends that you run a light concentartion all the time (I am in my boat) and then a double concentration for storage.

I am over simplifying this, as I am not one of the techs (nor do I play one on TV).

Bottom line: Clean fuel with no excess moisture and you should get years of service from the motor.
 
Yes I really agree about fuel.....(shop teacher for 30 years).... I even added 2 Racor filters...one for each tank...and have a method of seperating each tank...so if I buy a tank of bad fuel I can switch and run off the other while I service the bad side... I had such problems with air leaks that I wanted to eliminate anything common to both engines.... I think I have all the air leaks cured now..... Next I will attack the carbs...one motor at a time...to see if that affects my WOT..... decided to buy new props... then have my old ones repitched one size down...if that works.... I will EBAY the stock ones....

Joel
SEA3PO
 
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