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Old 17 April 2016, 11:29   #1
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Can't figure out what's wrong here.. Did I muck sth up? Suddenly lost half power :(

Can u listen to the vids and let me know what you think?

First run 3 weeks ago



Then this yesterday..



Did compression test, all three on 140 psi..

Cyl 3 started missing, boat running half the speed, carbs cleaned 4 times, check lines, for the life of me can't figure out what's wrong.

Senior member from another site says broken coil magnet shouldn't cause that, he's seen many motors with those things cracked running fine..

Did I blow something??

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Old 17 April 2016, 11:31   #2
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Other forum here:



http://www.marineengine.com/boat-for...epair&p=534450

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Old 17 April 2016, 20:09   #3
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I had a Mercury do that to me, it turned out a plastic piece of the throttle linkage under the hood had broken and would not advance the throttle, although I couldn't tell while driving that the linkage was broken.

Edit - just watched your video, I think its fuel related. Gas line or probably connector from line to engine. Swap out tank and/or fuel line and connector and go from there.
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Old 18 April 2016, 00:15   #4
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When I drain carbs they're full of fuel.. Tested pump, had good flow.. New orings on connectors.. My plastic thing also broke but epoxied it back, still holding well..

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Old 18 April 2016, 01:34   #5
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What's the fuel bulb like when it starts missing a beat? If in doubt - then replace. Original or Quicksilver part. Are you getting sparks to all cilinders?
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Old 18 April 2016, 01:41   #6
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Bulb feels medium, not hard or soft.. Tried different tanks, etc. Sparks on all yes, as I posted cyl 3 was not sparking at 7 btdc like 1 was, very odd, could magnets have slipped?

The power has just basically halved, I have been mucking around and so but I'm sure it's set up close enough to run much better than that..

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Old 18 April 2016, 01:44   #7
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Fuel related by the sound of it. Fuel tank venting ok??
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Old 18 April 2016, 01:45   #8
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Yes, don't think it's fuel related.. Floats have always been full, twice dealt with gunk in floats and checked pump diaphragms, 3 tanks, new connection orings.. Bulb pumps good fuel.. Filter always full..



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Old 18 April 2016, 04:09   #9
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does it start off with being ok and then latterly dying?
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Old 18 April 2016, 04:27   #10
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In what sense, IE seconds or days? Days yes, seconds
No.. Didn't fiddle too much.. Just cleaned carbs checked Max timing etc.. Bogs on acceleration, running.. Starts and idles instantly..

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