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Old 05-13-2018, 12:52 PM   #1
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Default Back fire in carburetor...

I was out yesterday first time this year, with my boat.
2001 Maxum 2100SR2 with 5.0 l engine.
The first 20-25 minutes everything was fine. Low speed full speed, no problem.
Then I have to slow down because some waives and try to speed up again, when some back fire start in my carburetor, lose power and engine stop.
Open the engine hood check see if everything is ok. Don't see anything wrong.
try to start again after 3-4 minutes, start up with no problem. Turn around and go back to the ramp.
From that point to the ramp, happens 5 more times. but after 3-4 minuter start and run for like 4-5 minutes then back fire and stop the engine.
Anybody have any idea what can be wrong?
Thanks for your time.
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Old 05-13-2018, 01:50 PM   #2
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Iím thinking itís time to rebuild the carb. Gunk in the bowl, sinking float, clogged passages, ...
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Old 05-13-2018, 02:28 PM   #3
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Originally Posted by mmwjr View Post
Iím thinking itís time to rebuild the carb. Gunk in the bowl, sinking float, clogged passages, ...
That was my first guess.
When engine stop running, I try to restart but would not start. But will start after 4 minutes....and run good for 4-5 minutes. Like a timer.....
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Old 05-13-2018, 05:22 PM   #4
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Ok before touching the carb run the boat to repeat the issue and check for spark as soon as I dies. Ignition sensor in the distributor is know for this same symptom. Easy way to do this is have a timing light set up in advance, when it dies crank and have someone hold the timing light trigger to see if it flashes. No flash itís an ignition issue and youíll then have to test the sensor.
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Old 05-13-2018, 07:38 PM   #5
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Good ,morning
Also sounds like a bad coil.
A bad coil will quit working then after a few minutes will start again and then quit again after a short while.
Just my 2c.
Don
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Old 05-13-2018, 09:37 PM   #6
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Good ,morning
Also sounds like a bad coil.
A bad coil will quit working then after a few minutes will start again and then quit again after a short while.
Just my 2c.
Don
Yes Don that is a possibility which is why I asked him to determine if spark is going away then he will need to isolate between the coil and ignition sensor although it could be another electrical component but these are the most common.
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Old 05-13-2018, 11:54 PM   #7
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Thank you guys.
I try here in home with water hook up and run the engine like in the water 3800-3900 RPM run great for 35 minutes, nothing happen.
Next time I go to the bay, I will take a ignition coil and the timing light with me.
I will let you know what i find.
Thanks again.
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Old 05-14-2018, 10:09 AM   #8
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Don't run those RPMs on a garden hose flush hookup!
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Old 05-14-2018, 11:38 AM   #9
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Quote:
Originally Posted by jparsons121 View Post
Don't run those RPMs on a garden hose flush hookup!
Agree, first a hose cannot provide enough water flow but more important you will cause engine damage at those rpms with no load on the engine.
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Old 05-14-2018, 06:12 PM   #10
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Quote:
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Don't run those RPMs on a garden hose flush hookup!
Quote:
Originally Posted by mmwjr View Post
Agree, first a hose cannot provide enough water flow but more important you will cause engine damage at those rpms with no load on the engine.
I use a 55 gallon plastic drum cut to the height i need it.
Fill up with water and let the water on so coiling the water what come out from engine.
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