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Old 15-09-2016, 05:15 PM   #1
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Engine problems

Hi,
I wonder if anyone could help me please,
I have 2 x yamaha f50 2005 engines (with 350 hours on each), with intermittent problems, some times they re a pain to start, sometimes ok, when started and up to temperature if you stop momentarily then put them back in gear one or both will stall, sometimes when coming to the jetty and you go to put them into reverse one or both will stall, when moving with any amount of throttle at any speed they are running perfect, both had new plugs, oil etc
Any ideas welcome
Thanks
Leighton
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Old 15-09-2016, 10:36 PM   #2
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Quote:
Originally Posted by leightonkeay@yahoo.co.uk View Post
Hi,
I wonder if anyone could help me please,
I have 2 x yamaha f50 2005 engines (with 350 hours on each), with intermittent problems, some times they re a pain to start, sometimes ok, when started and up to temperature if you stop momentarily then put them back in gear one or both will stall, sometimes when coming to the jetty and you go to put them into reverse one or both will stall, when moving with any amount of throttle at any speed they are running perfect, both had new plugs, oil etc
Any ideas welcome
Thanks
Leighton
Fuel lines as both to have the same symptoms is unlikely.

Do they run to the same tank?

If so.. There's where to start

Mike
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Old 15-09-2016, 10:51 PM   #3
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They are running separate tanks, problem is not there when going , just tick over or going from fwd to neutral to reverse or vice, will check/change the fuel lines though , thanks
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Old 16-09-2016, 10:53 AM   #4
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Are they carb motors?
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Old 16-09-2016, 10:55 AM   #5
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Are they carb motors?
Hi, yes they are carbs
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Old 16-09-2016, 11:43 AM   #6
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I was thinking the same. Could it be the carb's hava some dirt in them that makes them run poorly at idle speeds?
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Old 16-09-2016, 07:40 PM   #7
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Not sure if this helps but I had the same problem on a Merc I used to have and it turned out to be the diaphram on the fuel pump....good luck with finding the problem
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Old 16-09-2016, 07:46 PM   #8
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Thanks, will check them
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Old 16-09-2016, 09:54 PM   #9
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Not sure if this helps but I had the same problem on a Merc I used to have and it turned out to be the diaphram on the fuel pump....good luck with finding the problem
Shouldn't the problem multiply once the engine rev up to top speed - aka need of more fuel? (If you get my point?)
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Old 16-09-2016, 09:56 PM   #10
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They are fine at top speed, singing away with no problems
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Old 16-09-2016, 10:33 PM   #11
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Shouldn't the problem multiply once the engine rev up to top speed - aka need of more fuel? (If you get my point?)
I know what you mean but by changing mine it cured the problem..it wasnt split but probably got weak.
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Old 17-09-2016, 06:30 AM   #12
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Quote:
Originally Posted by mike k View Post
I know what you mean but by changing mine it cured the problem..it wasnt split but probably got weak.
Okay, point taken. Just as long as it worked for you😄.
Remember to keep us posted Of the result👍🏻
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Old 17-09-2016, 07:52 AM   #13
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Will do, and thanks for suggestions
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Old 19-09-2016, 10:17 AM   #14
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Quote:
Originally Posted by leightonkeay@yahoo.co.uk View Post
Hi, yes they are carbs
I had a similar problem, Try this, drain the fuel in the carbs by removing the little bolts on each carb.
Locate the jet screws. You can either mark and turn in first to work out how many turns out they are set at or check the manual for the default settings. My F100 is 2 turns out.

Get some carb cleaner spray into the jet holes on each carb, spray the jets and put back in. Replace the bolts you took out to drain the carbs.

Additional but may not be required I added loads of Seafoam to the fuel tanks. I also replaced the primer bulb as it looked like it was breaking down on the inside and the fuel filter.

This solved the problem for me.
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Old 19-09-2016, 10:25 AM   #15
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Ok thanks, will do
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