Registered User
Country: England
Location: Cowes, Isle of Wight
Occupation: Marine engineer/electrician
Interests: Boat, Landy, and other toys :)
Boat name: Mad Max/Master Fiddler
Boat make: Phantom 18/Fletcher Bravo
Engines: Merc XR2
Cruising area: Solent/IOW
Join Date: Dec 2005
Location: Cowes, Isle of Wight
Posts: 935
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Are you sure that the reason it's only running on 3 is due to no spark?
Otherwise the problem may well be fuel (or lack of!), see if it's sparking, if it is then i'd give the carbs a good thorough cleaning (fully dismantle, clean all components with a decent fuel system cleaner and blow through with compressed air), or use an ultrasonic cleaner. If you don't have access to one of these then leaving the seperate carbs to soak in methylated spirits for 24hrs works wondes at cleaning all the intricate passageways, just don't soak any plastic floats or rubber seals. Also would check float levels while they were apart.
If it's getting fuel to the cylinder then do a compression test.
Max
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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, grinning from ear to ear, overdosing on adrenaline and proclaiming “KINNEL!! WHAT A RIDE!!”
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