Re: 5000 - 8000 RPM Surprise


"Reginald P Smithers III, Esq." <r.p.smithersIII@xxxxxxxxxxxxxxxxx> wrote in
message news:crSdnb1z6MiINqvXnZ2dnUVZ_ixi4p2d@xxxxxxxxxxxxxxx
Calif Bill wrote:
"Reginald P Smithers III, Esq." <r.p.smithersIII@xxxxxxxxxxxxxxxxx> wrote
in message news:U6CdnVljEuRvzqvXnZ2dnUVZ_uJi4p2d@xxxxxxxxxxxxxxx
John H wrote:
On Mon, 15 Jun 2009 07:50:33 -0400, "Reginald P Smithers III, Esq."
<r.p.smithersIII@xxxxxxxxxxxxxxxxx> wrote:

Mike Slater wrote:
"Eisboch" <nothere@xxxxxxxxxxx> wrote in message
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"Mike Slater" <chuck@xxxxxxxxx> wrote in message
news:knfZl.742458$yE1.158636@xxxxxxxxxxxx
I was cruising along in my 24ft pontoon boat when I got a real
surprise. Somebody please tell me how and why I could be running
wide open throttle at my normal 5500 rpm and then suddenly the boat
took off like a bat out of hell running at 8000 rpms and 25mph???
I never touched the throttle. It has never run that fast ever.
After about 2 minutes it went back down to 5500 and never did 8000
again. Its a 60hp mercury Bigfoot outboard. It has never done this
before and I don't even know how it could rev that high and go
25mph. Normal is 5500 and 17mph. What happened??

Mike
Is it a two stroke? I've often noticed on 2 stroke weed wackers or
chain saws that just as you are about to run out of fuel they speed
up. I think they start running lean due to air in the fuel line.
Is it possible you had a temporary air leak in a line and a similar
thing is happening?

Eisboch

Yep. Its a two-stroke. It really caught me by surprise. Next time
I will look at the clear inline gas filter down near the primer bulb
to see if its empty if and when it happens. It was only my second
outing this year so who knows what going on and was too shocked to
think about looking at the fuel situation. You know, it sounded
great at 8000 revs.
Mike,
You may want to consider dropping back to a "cruising" rpm, instead of
running it WOT. Running the boat at WOT will shorten the life of the
engine considerably and use about 3 times the gas. For most boats,
the best gph or mpg is about 3400-3600 rpm. You shouldn't pick up
much incremental speed at WOT.
I ran mine at WOT yesterday, for the first time. Only did it for about
15 seconds. Man, that little boat is fast!
--
John H

"The democracy will cease to exist when you take away from those
who are willing to work and give to those who would not." Thomas
Jefferson
That sound of the wind whistling in your ears, was really the sound of
the engine sucking down the gas. ;)

--
Reginald P. Smithers III, Esq.

This Newsgroup post is a natural product. The slight variations in
spelling and grammar enhance its individual character and beauty and in
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That is why I have the sticker: My carbon footprint is bigger than yours.

Why are you dangling that bait in front of Harry?

--
Reginald P. Smithers III, Esq.

This Newsgroup post is a natural product. The slight variations in
spelling and grammar enhance its individual character and beauty and in no
way are to be considered flaws or defects

Just evil at times.


.

Relevant Pages

  • Re: 5000 - 8000 RPM Surprise
    ... open throttle at my normal 5500 rpm and then suddenly the boat took ... Running the boat at WOT will shorten the life of the ...
    (rec.boats)
  • Re: 5000 - 8000 RPM Surprise
    ... open throttle at my normal 5500 rpm and then suddenly the boat took ... Running the boat at WOT will shorten the life of the ...
    (rec.boats)
  • Re: 5000 - 8000 RPM Surprise
    ... Somebody please tell me how and why I could be running wide open throttle at my normal 5500 rpm and then suddenly the boat took off like a bat out of hell running at 8000 rpms and 25mph??? ... Running the boat at WOT will shorten the life of the engine considerably and use about 3 times the gas. ...
    (rec.boats)
  • Re: 5000 - 8000 RPM Surprise
    ... open throttle at my normal 5500 rpm and then suddenly the boat took ... Running the boat at WOT will shorten the life of the ...
    (rec.boats)
  • Re: 5000 - 8000 RPM Surprise
    ... Somebody please tell me how and why I could be running wide open throttle at my normal 5500 rpm and then suddenly the boat took off like a bat out of hell running at 8000 rpms and 25mph??? ... It really caught me by surprise. ...
    (rec.boats)