Carb problem
 

HI Group,

The sickie is a 1978 Chrysler, 2 cycle, 70 HP outboard. The motors
been gone through and re-gasketed prior to my entry into its world. I
finished the motor by going through all the externals to ensure it's up
to snuff per the motor manual.

Build a motor stand to test and run the motor out of the water but with
water hose cooling supplied of course. The motor fired off and ran for
around a minute but then started pushing gasoline out the card throats.
I went back in and checked the float settings and the needle and seat
but found nothing abnormal. Also checked the distributor timing but it
was right on the money.

Any suggestions on what to look for next?

Mike Oliver,
Pensacola, Florida

Carb problem
 

Mike Sr. wrote:

HI Group,
have you checked to see if your floats still float at the correct position

The sickie is a 1978 Chrysler, 2 cycle, 70 HP outboard. The motors
been gone through and re-gasketed prior to my entry into its world. I
finished the motor by going through all the externals to ensure it's up
to snuff per the motor manual.

Build a motor stand to test and run the motor out of the water but with
water hose cooling supplied of course. The motor fired off and ran for
around a minute but then started pushing gasoline out the card throats.
I went back in and checked the float settings and the needle and seat
but found nothing abnormal. Also checked the distributor timing but it
was right on the money.

Any suggestions on what to look for next?

Mike Oliver,
Pensacola, Florida

Carb problem
 

On 4 Feb 2006 07:23:01 -0800, "Mike Sr."
wrote:

HI Group,

The sickie is a 1978 Chrysler, 2 cycle, 70 HP outboard. The motors
been gone through and re-gasketed prior to my entry into its world. I
finished the motor by going through all the externals to ensure it's up
to snuff per the motor manual.

Build a motor stand to test and run the motor out of the water but with
water hose cooling supplied of course. The motor fired off and ran for
around a minute but then started pushing gasoline out the card throats.
I went back in and checked the float settings and the needle and seat
but found nothing abnormal. Also checked the distributor timing but it
was right on the money.

Any suggestions on what to look for next?

Mike Oliver,
Pensacola, Florida

Cracked or unseated inlet valves?

Brian Whatcott Altus OK

Carb problem
 

Brian,

Do you mean the reed valves that are in the intake manifold assembly?
If so, I didn't get into these as they were installed with new gaskets
and I assumed they were checked out and no problems found by the prior
owner.

If these are what you are think the problem is I'll certainly tear into
them after your positive response

Thanks, Mike

Carb problem
 

Tango,

I've set the float position per the manual in both the open and closed
position using the dimensions indicated for my model. However, I have
not tried to physicaly float the "float" to see if the gas flow is shut
off. I did use my lung power to determine if the float valve seated
while the float was upside-down. I could not hear any leakage and
could feel pressure build as I slowly operated the float manually.

Please advise how to check for float position on the bench. Your help
is certainly apreciated.

Thanks, Mike

Carb problem
 

"Mike Sr." wrote in message
oups.com...
HI Group,

The sickie is a 1978 Chrysler, 2 cycle, 70 HP outboard. The motors
been gone through and re-gasketed prior to my entry into its world. I
finished the motor by going through all the externals to ensure it's up
to snuff per the motor manual.

Build a motor stand to test and run the motor out of the water but with
water hose cooling supplied of course. The motor fired off and ran for
around a minute but then started pushing gasoline out the card throats.

I'd revisit the reed valves to make sure they are sealing properly.

Carb problem
 

If the float needle has the most minute marking on it, it could fail. I
would suggest getting new needles and seats for both carbs. They are not
expensive.

Don Dando


Mike Sr. wrote in message
oups.com...
HI Group,

The sickie is a 1978 Chrysler, 2 cycle, 70 HP outboard. The motors
been gone through and re-gasketed prior to my entry into its world. I
finished the motor by going through all the externals to ensure it's up
to snuff per the motor manual.

Build a motor stand to test and run the motor out of the water but with
water hose cooling supplied of course. The motor fired off and ran for
around a minute but then started pushing gasoline out the card throats.
I went back in and checked the float settings and the needle and seat
but found nothing abnormal. Also checked the distributor timing but it
was right on the money.

Any suggestions on what to look for next?

Mike Oliver,
Pensacola, Florida

Carb problem
 

On 4 Feb 2006 13:21:28 -0800, "Mike Sr."
wrote:

Brian,

Do you mean the reed valves that are in the intake manifold assembly?
If so, I didn't get into these as they were installed with new gaskets
and I assumed they were checked out and no problems found by the prior
owner.

If these are what you are think the problem is I'll certainly tear into
them after your positive response

Thanks, Mike

I have had a fixing screw come loose and hold an inlet reed valve
open. At the cost of pulling the carbs off to look, I'd think it's
worth a look?

Brian Whatcott Altus OK

Carb problem
 

Don,

Thanks for the advice in new needles and seats. Is there a good source
for these types of older parts? I've been looking on the internet and
found some suppliers but the best people may not be on the web.

Thanks again for the help,
Mike, Pensacola

Carb problem
 

Brian & Tennis Shoes,

It seems you both think alike for the problem being the reed valves.
Since I've pulled the carbs off to check the floats, I might as well go
a little deeper. The manual has lots of possible problems shown such
as bent, unseated, dirty, rusted, etc. Thats where I'm heading next
besides new needles and seats.

Thanks again,
Mike, Pensacola

Carb problem
 

"Mike Sr." wrote in message
oups.com...
Brian & Tennis Shoes,

It seems you both think alike for the problem being the reed valves.

Your symptom of 'burpin & fartin' out the carb can come from compression
escaping the cylinder(s). The reed valves are the only thing keeping the
compression where it's supposed to be.

Carb problem
 

On Sun, 05 Feb 2006 17:21:58 GMT, "TennisShoes"
wrote:


"Mike Sr." wrote in message
roups.com...
Brian & Tennis Shoes,

It seems you both think alike for the problem being the reed valves.

Your symptom of 'burpin & fartin' out the carb can come from compression
escaping the cylinder(s). The reed valves are the only thing keeping the
compression where it's supposed to be.


If you lift the heads (usually not hard to do) you might get a nasty
surprise to find one or more rings broken or gone altogether.

Brian [pilin' it on] Whatcott Altus OK

Carb problem
 

Brian,

I took a compression test before I even started on the motor as I
didn't want to sink money into a boat anchor rather than motor. It ran
130-145 PSI on three separate times (just oiled, 2 days later, 1 week
later). It was also for that reason that I didn't think the reeds were
at fault. But the reeds could leak (or seep) but the compression tools
wouldn't know that due to the check valve retaining the readings in the
gauge.

If the carb seats and the reeds do not cure the problem, then I pop the
head to look futher.

Thanks again for the advice,
Mike, Pensacola, Florida (Gods waiting room)

Carb problem
 

There may be part # on the parts. A small engine type might have an
assortment on hand. Varnish can build up in the hole for the needle,
causing it to stick. Clean with a cotton swab and camp stove gas. Dry
with air. A proper carb man would clean out every orifice with high
pressure air.

I have a badly worn carb that would not behave until I wired snug
external O rings above and below the butterfly throttle shaft with
brass snare wire. It was so loose it wiggled and upset the mixture any
where near idle, or, it seems, whenever it chose to.

Terry K