40 hp Merc engine dies as throttle is put on

[CpnSensible]

Hi, I have a red band 40 HP Mercury (approx mid 70's I think)<br />the motor will start and idle very roughly. When you put it into forward gear and try and accelerate the motor just dies. I have had a look at the carby & stripped it down - all ok. There doesn't seem to be any response at the butterfly when you actually throttle down - the warm up lever does have an effect though. Is there likely to be something that has become disconected or broken off?<br />The other thing I have noticed is that there is signs of moisture in the lower cyclinder (the fuel is fresh & clean) could this water be getting in from the water jacket?<br />Hope someone can help<br /><br />thanks in anticipation

 

[JB]

Re: 40 hp Merc engine dies as throttle is put on

G'Day, Sensible.<br /><br />If I understand you correctly, your control is not opening the throttle, yet the warm-up lever does.<br /><br />If that is the case, you have a loose connection (maybe broken) to the throttle cable in your control box.<br /><br />Good luck.

 

[CpnSensible]

Re: 40 hp Merc engine dies as throttle is put on

Thanks for the reply JB - the throttle does actually move at the motor end - but for some reason it doesn't seem to have any effect on the carby. The problem seems to be between the connection at the motor to the carby itself. I can see 2 levers - one seems to move when you use the warm-up lever, the cable moves on the throttle one but nothing moves at the carby itself? How is it connected to it? Do the two work together somehow?<br />My friend and I are pulling the powerhead off at the end of the week, as we discovered the bolts on the exhaust side of the side cover are just ornaments! Approx 5 of them are just sitting in there (stuck in with some silicone ) so to fix that we are going to have to drill out the remaining threads and retap.<br />I have only just bought the boat about 2 weeks ago - I suspected the motor would have some problems as the previous owner was very vague about it!<br />The motor does run - but very roughly & seems to die when it has warmed up. Any clues as to what this could mean? We have put in new plugs and leads and the fuel is ok.<br /><br />any clues would be useful<br /><br />thanks