venom
28.04.2021 14:51:43
Don't know why it does this but I have a 2000 Yamaha 40 2-stroke that does the exact same thing. Hope someone can clue us in.
See full version: F225 surges and misses over 4000 rpm
Don't know why it does this but I have a 2000 Yamaha 40 2-stroke that does the exact same thing. Hope someone can clue us in.
Re: F225 surges and misses over 4000 rpm here
because the yamaha software doesnt have that function.
a few programs do have that function just none that fit the yamaha.
what usually happens is untrained techs or techs that have completed outboard systems get intimidated by all the wires and shiney parts and leap to conclusions.
if it was a low voltage due to a bad cable that wil show up on the yamaha software.
if it was a TPS stuck that wil too.
however it says no codes.
there are a few in range sensor failures that can bite you but if the tech is trained and knows how each engine subsystem affects the rest its easy to spot.
and thats the problem on the net sometimes.
we are not looking at it.
we have no way of knowing if the regulator/driver update was done,the throttle bushing update nor the link rod update.
but all tests have to be conducted at the problem RPM and load.
thats where the dyno or the YB1626 test whel comes in handy.
sometimes though I simply have to crawl out on the braket and take a flying ride listening to it scream with the hood off.
cleaning out the VST on the F200/225 takes me about 2 hours 2 and 1/2 if I go ahead and swap the injectors with ones already reworked,cleaned and tested by flagship.
we keep 3 sets in stock.
its typically a judgement call based on the amount of debris in the VST and 30 years of experience.
stbd side injectors take about 15 min port side about 2.5 hours.
so at 4200 RPM with 38 PSI on the rail, no codes no inrange failures then your typically looking at a lack of fuel in a cylinder for whatever reason.
or a simple dead spark plug, easily found with your Kv tester. [links]
One of the local six pack charter guys running a Parker Pilothouse 25' DV that weight in at 9,400lbs runs F150s and have close to 5,000 hrs on the powerheads. Lowers start to go after 4,000 hrs. more
As for motors off the Grady, if the Grady was a 33' Express, I might have some concern since those motor generally were close to 5,000 RPM at cruise with some pretty flat wheels.
And lastly, make sure the length of the motors are correct for your application, either being 25" (X) or 30" (U) and weather motors are mechanically or digitally controlled (mechanical controls/guages/harnesses are significantly cheaper than digital).
And lastly, make sure the length of the motors are correct for your application, either being 25" (X) or 30" (U) and weather motors are mechanically or digitally controlled (mechanical controls/guages/harnesses are significantly cheaper than digital). [links]
well or starters quit chasing wabbits and hunting ghosties. [links]
if the engine is running rich (i have black streaks out the exhaust) and the sensor was stuck at 0.4V (at time of testing not failure) doesn't that point to the O2 sensor (note - i don't know the voltage at failure since i have not been able to reproduce it)? Have you ever seen the o2 sensor indicate a lean condition telling the CDI to increase the injection length and flooding the engine with too much fuel? more
typically if you see fuel flow increase for the same RPM the ECU is trying to compensate for something. either the RPM is not at the map for the TPS and CPS feedback or it sees a loss of 12V and is compensating by increasing injector on time. here
I can also add that the motor in question (starboard) burning between 10% and 15% more fuel than the port engine. is that normal? more
the O2 sensor is simply a fuel trim.
wont cause bogging but it can cause a lean condition above 4000 RPM.
the only time a code will be displayed is if it is active.
the ECU does NOT store codes.
The only thing i did was change the water separator and check to make sure the water indicator in the engine filter was not floating.
A new gold V on the cowl graphic identifies the Yamaha F350C. [links]
The Yamaha F350 was introduced as a locomotive of an outboard, a torque-monster 5.3-liter V8 swinging a 16.25-inch diameter prop with the authority required to push the 11,000-pound 11’ 7” wide Grady-White Express 330 up onto plane or over a barn-high swell. A pair of F350 motors was portrayed as a light-weight, space-saving alternative to inboard engines on boats that were simply too heavy for any other outboard engines available at the time. With F350 outboards on the transom, there was suddenly a big empty space where an engine room used to be–room for fish boxes or an aft cabin. more
The Mercury Verado 350 can match the horsepower rating of the F350C, but only the exotic 6.2-liter V8 Seven Marine 557/627 can top the displacement of the big Yamaha in the outboard category. Yamaha stresses that its normally-aspirated V8, aided by variable intake valve timing, produces exactly the torque curve ideal for pushing a heavy boat–rising smoothly and quickly off idle and staying fat in the mid-range. It’s that power that gets translated into thrust through a prop with lots of blade area. Mercury can squeeze up to 400 HP from its Verado platform, but relies on a supercharger to blow power into a 2.6-liter six-cylinder powerhead and a 5800 to 6400 WOT RPM range to produce peak horsepower. It’s worth noting that the Verado platform was originally designed to produce at most 275 HP. It’s also worth noting that a Verado can swing a 16-inch diameter prop, and I have never been disappointed in the supercharged thrust produced by a Verado, even on a heavy boat like the Boston Whaler 370 Outrage, which we ran with a Verado 350. here
Citing its commitment to continuous product improvement, Yamaha Marine has introduced an F350C version of its big V8 F350 outboard first introduced in 2007. The “C” designation denotes a third generation of the motor with a number of incremental changes Yamaha has incorporated in recent years, including improved gearcase lubricity and corrosion resistance, reduced weight, and the extension of the standard warranty to five years. Wrap it all up in new cowl graphics and you’ve got the F350C, which we tested and captured on film in this First Look Video.
more
In the ensuing decade applications for the F350 have broadened; a single V8 Yamaha is replacing twin 200 HP motors on many center console boats, for example, and even powering mega-pontoons. And the population of larger outboard-powered boats has grown significantly, according to Yamaha, which reports that sales of boats over 35 feet have increased 31 percent since 2007.