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Old 01 September 2012, 11:22   #11
Sea Witch's Avatar
Country: Ireland
Town: clifden
Make: Fletcher Bravo Arrow
Length: 5m +
Engine: Yamaha 175
Join Date: Jan 2010
Posts: 43
I had similar problem with my 40hp yammy , turned out to b water in d carbs - worth cleaning

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Old 01 September 2012, 13:35   #12
Country: UK - England
Town: liverpool
Make: avon
Length: 5m +
Engine: yamaha 90
Join Date: Aug 2009
Posts: 8
carbs have been stripped, cleaned and rebuilt with new gaskets and jets.
after a lot of work i am know 99% convinced it is an electrical not fuel problem possibly a dodgy connector or something more serious('s) fingers crossed its the first.

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Old 19 September 2012, 10:47   #13
Daibheid's Avatar
Country: Ireland
Town: Cork
Boat name: Excalibur
Make: Excalibur + Zapcat
Length: 6m +
Engine: Merc120TDI,Tohatsu50
Join Date: Jun 2005
Posts: 261
Saw a similar problem with the same engine which eventually deteriorated to 2 cylinders only running. It proved to be one of the trigger leads from the CDI box to the coils had corroded down its copper core into the sealed CDI box. An expensive fix and secondhand ones are scarce so I hope it's not your issue but it produced a lot of symptoms consistent with fuel starvation and always had a great spark when static/low speed tested.
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Old 19 September 2012, 11:54   #14
Country: UK - Scotland
Town: wormit
Boat name: lots of them
Make: various
Length: no boat
Engine: all types
Join Date: Dec 2004
Posts: 434
Run the engine with a flat out with a stobe light on each cylinder you will soon see what spark is breaking down however 1999 was the beginning of the prime start engines. Is this one? If it is, have you checked the small diaphram in the middle carb that will make you engine run richer than it should if its bust.

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