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Old 18 July 2010, 18:25   #1
Sea Witch's Avatar
Country: Ireland
Town: clifden
Make: Fletcher Bravo Arrow
Length: 5m +
Engine: Yamaha 175
Join Date: Jan 2010
Posts: 43
Yamaha 40 problem

Hi guys

Have a problem with a yamaha 40 , 2 stroke , 3 cylinder 1995 tiller

it is droppin down onto 2 cylinders , wen i go full throttle it runs perfectly but then there is a loss of power after a while and wen i throttle off it comes back , happens every now and then .

i took the sparks plug out wen it happened and none of them were wet indicating it was a coil goin down , i have 2 water filter seperators on , so it not water getting into the system.

i have also replace the fuel pump diaphram . there was no water on the vacum side indicating that the crank shaft seal was gone .

was thinking of getting a new coil and changing out one at a time to c if it was a coil issue

is there a rev limiter on this engine ?? is the cdi a issue ??

need some help in solving this one as its quite annoying wen it happens

regards Sea Witch

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Old 18 July 2010, 23:29   #2
Country: UK - Scotland
Town: Clackmannanshire
Boat name: SEAMATE
Make: Avon
Length: 4m +
Engine: 40 hp 2 Stroke
Join Date: May 2005
Posts: 74
Hi there had the same problem when I had the same engine I took off all 3 carbs and cleaned them , and it was all right after that .
kev is offline   Reply With Quote

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