Evinrude 50 - bogs down at WOT

[USS Neversail]

OK, here's the situation . . . <br /><br />83 50 HP Evinrude - sat out in weather for 4 yrs. Been cleaning - plugs, gas lines, carbs (pulled apart and sprayed lots of carb cleaner, but no rebuild), Seafoam in the gas tank (1 oz. to 1 gallon - 3 gallons), compression 155 & 160, what appears to be new power pack and new (?) things at the opposite end of the spark plugs (not the plugs, the other end), new gas bulb and line . . . that's pretty much it . . . NOW . . . <br /><br />At WOT, she bogs down. Up to 3950 RPM's, runs great. Then, bogs down and the RPM's drop. No overheating (oh, yeah, new thermostat), good pee. Semi-firm bulb at WOT. <br />Tonight - went to WOT with the lever, and she bogged down, then pushed the key in and then she acted flooded till I released it, then up to 4700 RPM's and she ran like a CHAMP! For a few minutes, that is. Then back to the same old 3900 RPM's. <br />Any suggestions?<br /><br />Thanks, in advance.<br /><br />Jason

 

[almost retired again]

Re: Evinrude 50 - bogs down at WOT

Hi Neversail,<br />Have you pulled the front off of the carbs. to see if the throttle plates are going past horizonal at wide open throttle? This can cause it to bogg down.<br />Keep us posted

 

[USS Neversail]

Re: Evinrude 50 - bogs down at WOT

Nope. I worried that I would flood the engine with water if I pulled the cover off while running it. <br /><br />If it'll be safe for the engine, I'll give it a shot! <br /><br />Hey, almost retired, what part of Missour-ah are you from. I was born in Springfield and my folks still live near there. Actually, I got family all over. Couple of uncles near Stockton, too.<br /><br />Looking forward your response.<br /><br />Thanks,<br />Jason

 

[USS Neversail]

Re: Evinrude 50 - bogs down at WOT

^

 

[USS Neversail]

Re: Evinrude 50 - bogs down at WOT

I rebuilt the carb tonight. Very clean from the last time I pulled it apart. <br /><br />Anyway, the linkage was all screwed up (probably from the last time I took the carbs off) and the throttle plates in the carb throats weren't even opening a quarter of the way at WOT. Fixed that now, the roll pins are exactly verticle and the plates open to horizontal now. I had to turn the WOT stop screw about 1/4 in. down! That seemed like a lot, but I figure I can keep an eye on the RPM level when I test it. <br /><br />Are the plates only being open a quarter of the way a probable reason for the boging down after 3900 RPM's?<br /> <br /><br />Thanks, <br />Jason

 

[USS Neversail]

Re: Evinrude 50 - bogs down at WOT

bump