"Eisboch" wrote in message
...

"Mike Slater" wrote in message
news:knfZl.742458$yE1.158636@attbi_s21...
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.