motor won’t stay running

[tony69starcraft]

i have a 1967 60hp johnson. last year the motor did a lot of chugging under acceleration and would die at idle but would run just fine at wot. i bought a rebuild kit and cleaned the carb. i set the low speed needles at 1 1/2 turns out, the high speed jets are fixed. i can get the boat to start but it runs at a high idle for a few seconds and then dies. no adjustments 1/4 turn at a time in either direction with the needles is helping. if it helps there’s a healthy amount of blue smoke coming out of the exhaust.

i’m about ready to just cut my losses and sell this thing unless anybody has some suggestions.

thanks in advance,
tony

 

[Crosbyman]

not to fast Tony….:bolt:


first thing is to do the cheap easy stuff….

a; if you prime the bulb when near death does it help if yes suspect the pump
b- the vent is open I presume ….remove the tank cap see if it lives longer if yes possible venting issue
c- high speed jet is or are fixed but did you clean then with a VERY small wire to decrud them + wash and blow them
d- have you check all filter points for clogs and tried different tank and hose ??
e- can you check for sparks just after it dies ?
f- what about possibility of overheating… impeller OK pee stream ok engine block touchable or burning hot ?
g- oil mix OK ?

patience brings joy :victorious:

etc... etc... more to come from others….

 

[racerone]

Could be as simple as throttle plates slightly open at idle.-----I am not there to help sort out what could be one or more simple issue.

 

[tony69starcraft]

i haven’t tried priming the bulb before it dies, but, after a few starts and stalls, the bulb is essentially empty and i have to pump it back up again. what would that mean?

the tank in it is probably about as old as the motor, but it’s clean inside. i don’t know about a vent? maybe i’ll just crack the cap and see if that helps.

i was very meticulous about cleaning. carb cleaner, small wire through the jets, blew out with air hose... that carb can’t be any cleaner

the block isn’t hot, i know it’s moving good water because one of the cooling hoses had a small crack in it and was jetting out water. the hose was replaced with an oem hose

new gas, marine stabil, 50-1 mix, the gas should be fine.

i’ll try venting the tank to see if that helps, if that doesn’t help, what else could be wrong? the bulb definitely empties after a few starts. it also leaks a small amount of gas when you squeeze the bulb from under the clamp, not sure that makes a difference

 

[racerone]

Try another tank and hose.-----The fuel pump diaphragm could have a pin hole in it or valves in pump have dirt in them.---And you do have spark on al 4 leads ?

 

[tony69starcraft]

i’ll check the spark.

i dont know anything about the fuel pump, i don’t even know where it is, i’ll have to look that up

 

[racerone]

Just follow the hoses to find the fuel pump.----The original pump is shown to have a sight glass and filter.----No telling what is installed on it now !

 

[tony69starcraft]

if anybody is in nw ohio and wants to look at it, i have cash $$$. none of the local marinas will look at a motor that old, ive called all of them

 

[racerone]

They will look at it if you promise not to complain afterwards about the $ amount to repair these motors.----The other issue is that most modern shops do not have a patient mechanic who knows how to trouble shoot elegantly simple stuff.----You can learn to do all this stuff yourself if you follow simple advice and instructions from contributors here.

 

[Crosbyman]

fuel bulbs are funny they don't necessarily stay hard after pumping up the fuel circuit ..fuel can still flow adequately but if it sucked dry and crumbles then the tanks doesn't vent or something is plugged South of the bulb so just open the tank cap for now and hand prime the bulb before it goes dead on you …


btw some fuel line inner sleeves get destroyed by ethanol and act weird causing all sorts of unsuspected grief.

progress slowly and eliminate probable causes your motor seems to be running of fuel (food) izza:


that fuel pump… if original has a filtering mesh bag just unscrew the glass thingny under it and wash the filter with carb cleaner and blow dry…then reinstall it could be all jammed up with crud/varnish

if gas leaks out when pumping it also means it can suck air at he same joint....NOT GOOD so close it up do whatever it takes to stop gas leaks or borrow a fuel line from a friend to test it out .

You can wrap 5-6 layers of saran wrap around the pump and seal it with electrical tape or tye wraps to stop any intrusion of air at the leak point....

pump it up and retest if ok ... fix the problem or buy a new OEM fuel line

 

[Crosbyman]

btw… when you serviced the carb did you install a small clip on the float arm… maybe the inlet needle is sticking

that little clip pulls out the inlet needle when fuel is consumed

when the float drops down it pulls the inlet needle down to let the fuel flow in the carb

works just like a toilet bowl valve :cold:

 

[Crosbyman]

[No message]

 

[Crosbyman]

[No message]

 

[tony69starcraft]

thanks for the advice on the fuel pump, i replaced that little filter and dumped out the bulb when i did the carb, i’ll look at the pump itself when i get a second. possibly tomorrow. right now the windchill is 21°, not good wrenching weather.

 

[tony69starcraft]

and yes, i attached the little clip from the needle to the float