When motor warm it will not start

Hello,

i'm new here, i'm Marcel, 27 years old and i am from Rotterdam, The Netherlands,
Europe.

I own a '88 Bayliner Capri 1950 Bowrider with 3.0 OMC GM motor.
I have a problem with the warm start.

When i'm cruising on the rivers and i shut the motor off, i can't get it running again direct.
It will crank, but not fire.
When i wait for about 30-45 minuten i will fire up again without any problems.

When its cold it will fire up in 2-3 second.
I can use it a top speed for longer time and i can cruise for 3 hours without any problem.

I checked the carb and taked the flame arrestor off and pulled the gas cable.
I saw 2 stream of gas squirting in the carb.
Also checked the little filter thats located at the point where the fuel line is bolted to the carb.
Also cleaned the flame arrestor and its pretty clean now.
So i assume its not a fuel problem.
I tryed to start without gas cap with warm motor but that doesnt help, so its not a vacuum problem.

Spark plugs wires and rotor cap and rotor are in good condition.
Also the ignition points seems very clean.

I think it will be the coil, as far is i can see the coil is still original (22 years old now)
Im thinking about upgrading the iginition system with a Pertronix electronic ignition and Petronix coil.

Wil that solve my problems ?

Best regards, Marcel

Re: When motor warm it will not start

if the coil was failing it would also fail when running and cause a no-run situation.

have a look into the carb next time it does it - see if its full of fuel/ fuel 'steam'

if so you might need a spacer under the carb to dissipate the heat

or you may have a dodgy fuel pump that keeps putting fuel to the carb after switch off - until the pressure drops in the system - causing a flooding situation

next time it happens check for voltage at the coil and check for a spark - just to rule it out

Re: When motor warm it will not start

Also try throttling in neutral !

after warm and shut down ,when you are ready to start again have you tried in neutral push the button on side of control box and throttle forward , crank and see if it will start, quickly return the throttle back down to lower RPM .




fish

Re: When motor warm it will not start

If the coil is gettting heat saturated it can fail when hot, and then cool off and work fine. If you have a spare try replacing it and see how it works.
It can also be the capacitor, it will cause a no spark if its not working.

Re: When motor warm it will not start

I noticed from your list of service parts that the condensor wasn't changed - or maybe it was and you just didn't say.

biffle - forgive me if the condensor is also known as the capacitor out there

mind you - if not, what is the capacitor?

Re: When motor warm it will not start

bifflefan said:

If the coil is gettting heat saturated it can fail when hot, and then cool off and work fine.

Click to expand...

I agree biffle - but he says he can cruise for 3 hours without problem

Re: When motor warm it will not start

libellav15 said:

biffle - forgive me if the condensor is also known as the capacitor out there

mind you - if not, what is the capacitor?

Click to expand...

You are right, stupid auto spell check...

Re: When motor warm it will not start

libellav15 said:

if the coil was failing it would also fail when running and cause a no-run situation.

have a look into the carb next time it does it - see if its full of fuel/ fuel 'steam'

if so you might need a spacer under the carb to dissipate the heat

or you may have a dodgy fuel pump that keeps putting fuel to the carb after switch off - until the pressure drops in the system - causing a flooding situation

next time it happens check for voltage at the coil and check for a spark - just to rule it out

Click to expand...

Thanks for your answer, im pretty sure the fuel system is working correctly.

But i will have a look at it the next tume

Re: When motor warm it will not start

fishinpa said:

Also try throttling in neutral !

after warm and shut down ,when you are ready to start again have you tried in neutral push the button on side of control box and throttle forward , crank and see if it will start, quickly return the throttle back down to lower RPM .




fish

Click to expand...

Im also doing that, i cant get i running in gear off corse.
But it wont help, not even one fire, complete dead.

Re: When motor warm it will not start

bifflefan said:

If the coil is gettting heat saturated it can fail when hot, and then cool off and work fine. If you have a spare try replacing it and see how it works.
It can also be the capacitor, it will cause a no spark if its not working.

Click to expand...

I will look for a spare and test that, they are not that expensive is it ?

Re: When motor warm it will not start

libellav15 said:

I noticed from your list of service parts that the condensor wasn't changed - or maybe it was and you just didn't say.

biffle - forgive me if the condensor is also known as the capacitor out there

mind you - if not, what is the capacitor?

Click to expand...

Where is the condesor located ?
Is it that metal looking little cilinder besides of the points ?

Re: When motor warm it will not start

Junkiexp said:

Where is the condesor located ?
Is it that metal looking little cilinder besides of the points ?

Click to expand...

Thats it.

Never touch the end of the wire and the condenser body at the same time.
You will get a suprising shock if there is energy in the condenser.