gagnon.sylv... at (no spam) gmail.com> wrote in message

news:75891839-5d1f-46f6-aa2c-df6033521575 at (no spam) x35g2000hsb.googlegroups.com...



Hi, I have a 75HP, 1992, 3 pistons/2 strokes Mariner engine that
started to give me trouble yesterday. While a was pulling a tube, the
engine suddenly lost power and even at WOT, would not go over 2,600
RPM (while pulling the tube).

I tried the boat alone and even at WOT, the RPM would slowly increase
up to 3,200 and then jolted to 4,000 and then I had to pull the
throttle so it wouldn't go over 5,000 RPM (ie, from 4,000 and 5,000,
the engine was behaving normally). Below 3,200 RPM, the engine noise
is 'deep' and rough.

I had my wife driving the boat while I was watching the engine for any
physical anomaly and couldn't see any. There was no sudden linkage
movement between 3,200 and 4,000 RPM. The butterflies were fully
opened with the throttle at WOT.

The only two things I can think of (and that's just guesses) is there
are two sets of injectors and one kicks in at 3,200 or there is a
second sets of butterflies that opens at 3,200 (but I didn't see any).

I had the injectors cleaned last fall and the engine was running
smoothly until this happened.

Anybody knows what could make the engine behave that way? Or if you
know a better newsgroup/forum to post my question, I'm all ear.

Thanks!

Over temp possible. Maybe low oil in the tank.

Hi, I have a 75HP, 1992, 3 pistons/2 strokes Mariner engine that
started to give me trouble yesterday. While a was pulling a tube, the
engine suddenly lost power and even at WOT, would not go over 2,600
RPM (while pulling the tube).

I tried the boat alone and even at WOT, the RPM would slowly increase
up to 3,200 and then jolted to 4,000 and then I had to pull the
throttle so it wouldn't go over 5,000 RPM (ie, from 4,000 and 5,000,
the engine was behaving normally). Below 3,200 RPM, the engine noise
is 'deep' and rough.

I had my wife driving the boat while I was watching the engine for any
physical anomaly and couldn't see any. There was no sudden linkage
movement between 3,200 and 4,000 RPM. The butterflies were fully
opened with the throttle at WOT.

The only two things I can think of (and that's just guesses) is there
are two sets of injectors and one kicks in at 3,200 or there is a
second sets of butterflies that opens at 3,200 (but I didn't see any).

I had the injectors cleaned last fall and the engine was running
smoothly until this happened.

Anybody knows what could make the engine behave that way? Or if you
know a better newsgroup/forum to post my question, I'm all ear.

Thanks!

I had the injectors cleaned last fall and the engine was running
smoothly until this happened.

Short Wave Sportfishing wrote:
On Mon, 23 Jun 2008 14:47:38 +0000, Larry <noone at (no spam) home.com> wrote:

The look on a boater's face when I tell him to open the gas cap a crack,
or the fuel valve he forgot to open, and the engine smooths out in 15
seconds, having watched his bulb collapse..........PRICELESS!..

One more advantage of direct injection two stroke engines - no primer
bulb.

Primer bulb - pfffhhhtt - ancient tech.

I understand your eTech runs on water vapors and pumps wine out the pee-er.

BTW, in the years I have owned two Yamaha four strokes I never once have
touched the primer bulb.

On Mon, 23 Jun 2008 21:45:22 -0400, HK <payer33859 at (no spam) mypacks.net> wrote:

Short Wave Sportfishing wrote:
On Mon, 23 Jun 2008 14:47:38 +0000, Larry <noone at (no spam) home.com> wrote:

The look on a boater's face when I tell him to open the gas cap a crack,
or the fuel valve he forgot to open, and the engine smooths out in 15
seconds, having watched his bulb collapse..........PRICELESS!..
One more advantage of direct injection two stroke engines - no primer
bulb.

Primer bulb - pfffhhhtt - ancient tech.
I understand your eTech runs on water vapors and pumps wine out the pee-er.

Not wine - bourbon.

BTW, in the years I have owned two Yamaha four strokes I never once have
touched the primer bulb.

Of course not.

Short Wave Sportfishing wrote:
On Mon, 23 Jun 2008 21:45:22 -0400, HK <payer33859 at (no spam) mypacks.net> wrote:

Short Wave Sportfishing wrote:
On Mon, 23 Jun 2008 14:47:38 +0000, Larry <noone at (no spam) home.com> wrote:

The look on a boater's face when I tell him to open the gas cap a crack,
or the fuel valve he forgot to open, and the engine smooths out in 15
seconds, having watched his bulb collapse..........PRICELESS!..
One more advantage of direct injection two stroke engines - no primer
bulb.

Primer bulb - pfffhhhtt - ancient tech.
I understand your eTech runs on water vapors and pumps wine out the pee-er.

Not wine - bourbon.

BTW, in the years I have owned two Yamaha four strokes I never once have
touched the primer bulb.

Of course not.

I kid you not. Never touched either of them. In fact, I didn't even know
where the current one was until I opened the bilge hatch this past week
to work the valve for the livewell. There it was...untouched.

Larry, it wasn't my problem, but you sure gave a splendid answer. I
learned something new. Thank you!
--
John *H*

gagnon.sylv... at (no spam) gmail.com wrote in news:faae4fbf-1ea6-4c84-973a-ad94923186e7
at (no spam) e39g2000hsf.googlegroups.com:

With my problem with the voltage regulator and the now the electronic
module, the boat is in the shop for a checkup :-(

Good idea....Towing is much more expensive than spark plugs and
coils....and ECMs.

With my problem with the voltage regulator and the now the electronic
module, the boat is in the shop for a checkup :-(