Maybe:The Tohatsu 25 will idle and run perfectly with the engine cover off but as soon as I put the cover on it begins to sputter. The air intake on the cover is not blocked in any way but for some reason seems not to be letting enough air in. Any ideas?
Very good!!, I forgot that one. We had a well & it was imperative to keep the lid wide open. Any exhaust gas blowback into the well would make the motor run rough. Check for any dis-colorization in the head gasket area & where theGood list BUT a fairly small exhaust leak will do this also
IIRC, since about the early 60's, the motors I had had fixed high speed jets with only the low speed circuit adjustable. If it will pull max revs under load with the cover off the high speed jet is probably OK.Thanks for all the answers. No pinching of fuel or electrical lines that I can see. The problem arose pretty quickly. Had it running at home when I got it running for the season, but the cover was off. I thought about the choke being partially engaged but that seems Ok. Could the fuel mixture be too rich?1
You are welcome, thanks for the feedback. One can always learn from other's experiences.Well I was not able to figure it out myself. Took it the boat / engine to the local outboard shop. Turned out to be an electrical wire issue that only acted up when the engine cover was on. Sparkplug wire replaced and tied town away from the cover. Haven't put in water yet to confirm. Looks like points top Dabnis for a good diagnosis. Thanks for all the suggestions.