fishingdale
New member
I have a small tinnie with a 2005 BF40 Honda 4 stroke on it. Over the last 6 months or so It has encountered a repetitive but intermittent fault. After running for 30 min or so at med -high speed it drops in revs and starts running rough. At first it was of night time and always on the way home. First I thought it was water in the fuel, while bobbing around a few mile out I drained the carbie bowls, flushed the filter with no result. Limped home @ about 6 knots. Relaced fuel filter, cleaned tanks, checked plugs and added an extra fuel filter. A couple of trips later same problem. It was due for its annual service so I took it in to the local honda dealer $550 later, took it out with the same result. Took it back, was told they had put the wrong thermostat in it and it was now all good. Went out same problem. Seems to be heat related because it only happens when it has run for a while and once cold resets. It has never had an temp alarm come up. Im thinking maybe a sensor or control card. Has anyone experienced this before.