Max Rpm for Yamaha 04 225
 

I recently bought a Sea-Pro 22CC with a Yamaha 4-Stroke 225

Im wondering what the maximum operating range for this engine would be?
The manual I got says the Max RPM is 5000~6000 but that isnt really
that specific. Im thinking the max RPM is WOT RPM?
Does anyone know if this is a downscaled 250 and if it is a strong
engine that could mabe stand the stress of periodic bursts of speed?

Ive bin running my boat out lately and at 3200 rpm its only getting 22
mph (with three people and almost 90 gallons of gas). Im thinking such
a small boat with quite a over sized engine as the manufacuter suggests
a 150-200 engine that the boat would be capable of higher speeds
without damaging the engine?

Also im wondering if the trim is having an adverse effect on the
engine, I usualy tilt it all the way down to get plaining so i can see
infront of me and tilt it up a bit after to get a better speed but it
only changes about 1mph. Im fairly new to outboard engines and larger
boating in general so any help or advice is greatly appriciated.

Thanks

Max Rpm for Yamaha 04 225
 

If you prop it to make 5500 WOT you're bound to be good. Try running it at
4000-4500 for more speed.

-W

wrote in message
ups.com...
I recently bought a Sea-Pro 22CC with a Yamaha 4-Stroke 225

Im wondering what the maximum operating range for this engine would be?
The manual I got says the Max RPM is 5000~6000 but that isnt really
that specific. Im thinking the max RPM is WOT RPM?
Does anyone know if this is a downscaled 250 and if it is a strong
engine that could mabe stand the stress of periodic bursts of speed?

Ive bin running my boat out lately and at 3200 rpm its only getting 22
mph (with three people and almost 90 gallons of gas). Im thinking such
a small boat with quite a over sized engine as the manufacuter suggests
a 150-200 engine that the boat would be capable of higher speeds
without damaging the engine?

Also im wondering if the trim is having an adverse effect on the
engine, I usualy tilt it all the way down to get plaining so i can see
infront of me and tilt it up a bit after to get a better speed but it
only changes about 1mph. Im fairly new to outboard engines and larger
boating in general so any help or advice is greatly appriciated.

Thanks

Max Rpm for Yamaha 04 225
 

wrote in message
ups.com...
I recently bought a Sea-Pro 22CC with a Yamaha 4-Stroke 225

Im wondering what the maximum operating range for this engine would be?
The manual I got says the Max RPM is 5000~6000 but that isnt really
that specific. Im thinking the max RPM is WOT RPM?
Does anyone know if this is a downscaled 250 and if it is a strong
engine that could mabe stand the stress of periodic bursts of speed?




Yamaha recommends propping the boat in the upper 1/2 of the motors operating
range, which for your motor is 5500-6000 rpm. With a full tank of fuel, a
normal load of people, and any gear, coolers, ice, etc. make sure the motor
runs at least 5500 rpm.

Your motor is built for long runs at high rpm if that is what you want to
do. Most boats cruise at around 4000 rpm.

The 250 is a completely different design than the 200-225 motors.

Bill Grannis
service manager

Max Rpm for Yamaha 04 225
 

Harry Krause wrote:

I have one of those engines, on a larger, much heavier boat than yours.
At WOT, I can run the engine up to 6000 RPM without any difficulty. I
don't do it very often, though.

Your best cruise RPM probably is 4000 RPM, or between 4000 and 4500 RPM.
The engine runs very nicely at those speeds. You should be getting more
than 30 mph at those RPMs.

What are you using to determine boat speed?


The Tach on the boat seems to always gum up the guy who sold us the
boat told us it hardly ever works. He installed a Fish finder with a
depth finder aswell as a built in tach with a little wheel at the back
of the boat. Like you see on most jet ski's, Im not sure how the
original one on the boat works.

Thanks for the replys I feel more comfortable running the engine at
faster rpms now.

Max Rpm for Yamaha 04 225
 

A *general* rule of thumb for most outboards is to prop for 5500, daily
cruise at 4000, and idle as low as it can get and not die when you put it in
gear.

Bill's info was more product specific, and therefore more correct.
Not that his numbers made me wrong, but his info is more right. :)

-W

wrote in message
oups.com...

Harry Krause wrote:

I have one of those engines, on a larger, much heavier boat than yours.
At WOT, I can run the engine up to 6000 RPM without any difficulty. I
don't do it very often, though.

Your best cruise RPM probably is 4000 RPM, or between 4000 and 4500 RPM.
The engine runs very nicely at those speeds. You should be getting more
than 30 mph at those RPMs.

What are you using to determine boat speed?


The Tach on the boat seems to always gum up the guy who sold us the
boat told us it hardly ever works. He installed a Fish finder with a
depth finder aswell as a built in tach with a little wheel at the back
of the boat. Like you see on most jet ski's, Im not sure how the
original one on the boat works.

Thanks for the replys I feel more comfortable running the engine at
faster rpms now.