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Been lurking the forums for a while and now have an issue with my 75 Optimax. I bought the motor new in February and it has run great until today. It should have around ten or more hours on it, broke it properly and has done no trolling. Ran out about ten miles this morning, 4000-4500 rpms and then shut down to fish on the trolling motor, no problems. Ran back in to the launch at around 4000 RPMs and when I came down to idle speed it ran rough for a second and died. Started right back up and idled rough and died. Started up again and turned around and put it up on plane. Ran fine at wot, around 5700 RPMs for a minute or so and then went back to the launch, was idling a little rough but shut it down before it died.
This boat has always had fresh non-ethanol fuel with stabil marine in it so I didn't supect fuel as being the problem but I still drained the Vapor Seperator into a glass jar and there was no water present.
I then pulled the plugs starting from the top. The first two looked good and pretty clean for a 2 stroke. The bottom plug didn't look fouled but it definatley had more oil and carbon build up than the other two. Cleaned the plugs and put them back in in reverse order so if that plug is bad it should show itself after another run. Idles fine on the hose, probably make a short run this evening to see how it does.
Any other ideas what could cause this? No alarm sounded. Just looking for ideas prior to going in for warranty service unnecessarily. Should all three plugs have looked identical, or close to it? Anything else that commonly causes a rough idle and die on these smaller Optimaxes?
This boat has always had fresh non-ethanol fuel with stabil marine in it so I didn't supect fuel as being the problem but I still drained the Vapor Seperator into a glass jar and there was no water present.
I then pulled the plugs starting from the top. The first two looked good and pretty clean for a 2 stroke. The bottom plug didn't look fouled but it definatley had more oil and carbon build up than the other two. Cleaned the plugs and put them back in in reverse order so if that plug is bad it should show itself after another run. Idles fine on the hose, probably make a short run this evening to see how it does.
Any other ideas what could cause this? No alarm sounded. Just looking for ideas prior to going in for warranty service unnecessarily. Should all three plugs have looked identical, or close to it? Anything else that commonly causes a rough idle and die on these smaller Optimaxes?
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