Hi, I just recently rebuilt the 3 carbs and put new plugs in my 1999
Johnson 60horse on my 17' Montauk.
I can get the throttle about 3/4 the way forward and then in
just bogs down. What I just notice today though, is that I can push
the throttle all the way up and then, intermitently push the choke and
get full speed and smooth running out of it!
I'm thinking that the throttle is giving more air than gas and that
might explain why the additional choking helps? I'm no mechanic, so I
may be way off, could it be the other way around? Once I know whether
it needs more air, or more gas, how would I adjust this? Is it the 2
cables coming into the motor that go to the plates? 1 must be air,
another gas....
Any help is greatly appreciated! It seems like the engine is only a
small adjustment away from being great and I just bought the boat, so
I'm looking foward to having it running well soon!

Also wondering lately, what might I expect to pay for a routine tuneup
and oilchange? I'd do the oil myself, but the Lower unit screw won't
even budge...

Just wanted to add... I'm not completely sure what the adjustments on
the crabs are yet. I have a very small brass screw at the top and a
steel screw below it ( slow speed needle?) I have the steel screw
backed out 2 turns and the brass ones on tight.. When I bought the
motor everything was messed up, so I'm not sure how to adjust these.
BTW, what might I expect to pay for a routine tuneup and oilchange?
I'd do the oil myself, but the Lower unit screw won't
even budge...

Just wanted to add... I'm not completely sure what the adjustments on
the carbs are yet. I have a very small brass screw at the top and a
steel screw below it ( slow speed needle?) I have the steel screw
backed out 2 turns and the brass ones on tight.. When I bought the
motor everything was messed up, so I'm not sure how to adjust these.
BTW, what might I expect to pay for a routine tuneup and oilchange?
I'd do the oil myself, but the Lower unit screw won't
even budge...

On May 24, 5:39 pm, wrote:
Hi, I just recently rebuilt the 3 carbs and put new plugs in my 1999
Johnson 60horse on my 17' Montauk.
I can get the throttle about 3/4 the way forward and then in
just bogs down. What I just notice today though, is that I can push
the throttle all the way up and then, intermitently push the choke and
get full speed and smooth running out of it!
I'm thinking that the throttle is giving more air than gas and that
might explain why the additional choking helps? I'm no mechanic, so I
may be way off, could it be the other way around? Once I know whether
it needs more air, or more gas, how would I adjust this? Is it the 2
cables coming into the motor that go to the plates? 1 must be air,
another gas....
Any help is greatly appreciated! It seems like the engine is only a
small adjustment away from being great and I just bought the boat, so
I'm looking foward to having it running well soon!

Sounds like it is starving for fuel, check the lines, pump, filter,
filter, filter and make sure you put everything together correctly,
timing is right, advance, etc... But it sounds like the first thing I
would check is fuel delivery.

wrote in message
oups.com...
Hi, I just recently rebuilt the 3 carbs and put new plugs in my 1999
Johnson 60horse on my 17' Montauk.
I can get the throttle about 3/4 the way forward and then in
just bogs down. What I just notice today though, is that I can push
the throttle all the way up and then, intermitently push the choke and
get full speed and smooth running out of it!


Did you replace the gaskets or re-use them? The small 1/2" dia. gasket that
goes around the high speed nozzle is very important and if leaking air or
not installed, the motor will have the same symptoms that you describe.

By hitting the "choke" you are opening an electric valve that allows raw
fuel into the intake. Since the motor then increases power, that means that
your carbs are not delivering enough fuel for some reason. What did you set
the float adjustment at?

I used 3 rebuild kits, replaced all gaskets, floats, float needles,
springs... I just notice that the 2nd cable off the throttle into the
motor is only for reverse anyway. So this is fixed high speed I guess.
I'll have to open the carbs up again and check the float distance,
they may be too far. The kit said 3/4" between gasket and float, but
the engine book says 1 1/8 between gasket and top of float. I may be
1/4" too much, would that make such a big difference?
BTW, after looking through this group archives, I found the tip about
heating the lower unit around the oil screws... Took 15 minutes total
for the job and now my oil is changed! No water came out.
I'll take it out tomorrow and fine tune the slow speed needle, I also
noticed that the steel pin which moves the entire 3 carb assembly was
1/2" away from the black plastic plate that engages it with the
throttle. This must be why I have some travel before I finally get
moving... I loosened the screw and adjusted slightly to test it for
now. I'm using a 50/1 mix but some seem to use 20/1 which would you
recommend? It's a 60Horse Johnson. Thanks for the help!

wrote:

Just wanted to add... I'm not completely sure what the adjustments on
the crabs are yet.

Hm. Adjustable crabs. Who'd'a thunk it?

DT

This morning I opened up the fuel pump and cleaned it. It was very
yellow inside! Immediately out on the water, I saw a difference, when
pushing the throttle up, it still bogged, but then came up and stayed
up to full speed! I think it's safe now to say that the fuel pump is
the issue. I ran it for 2 hrs today and it's the best it's been yet!
Now I'm not sure how to finally fix this, a fuel pump rebuild, or a
new one all together? I may start with a new fuel filter incase that
is coming into play somehow. Should I stick with 50 to 1 nix? I was
using wlamart 2 cycle, but just picked up a case of Valvoline... Read
that cheap 2 cycle will foul up more.

On May 25, 3:49 pm, wrote:
This morning I opened up the fuel pump and cleaned it. It was very
yellow inside! Immediately out on the water, I saw a difference, when
pushing the throttle up, it still bogged, but then came up and stayed
up to full speed! I think it's safe now to say that the fuel pump is
the issue. I ran it for 2 hrs today and it's the best it's been yet!
Now I'm not sure how to finally fix this, a fuel pump rebuild, or a
new one all together? I may start with a new fuel filter incase that
is coming into play somehow. Should I stick with 50 to 1 nix? I was
using wlamart 2 cycle, but just picked up a case of Valvoline... Read
that cheap 2 cycle will foul up more.

Don't worry yet about fouling up more, let's get you foulded up less
first
anyway, you have put enough into this so far, just finish the job and
be done with it. Get a new pump and filter, and put em' on. Don't
skimp now after all that work and money, finish the job and go out on
the water with confidence. Just my opinion.