Need Help!! 75"50hp Johnson Engine Trouble

[busta151]

Need Help!! 75"50hp Johnson Engine Trouble

Took my boat out for the first time yesterday and encounterd trouble.The motor hasn't run for about a year and when i started it out yesterday it started cold but after a few minutes it ran fine and started up on every key turn.But when i pushed it go go a little faster the engine sounded like it was going faster but it seemed like we werent going any faster.It didnt seem too bad but after taking it on a ride for more then a mile and a quarter and then it just died out.We waited a few minutes and then tried starting it again and again and then it finaly starte ran for maybe like 10 mins then just complety died out.When i tried to start it i got it started adjusted the trhottle and when i got out of neatral it just died out and would start again. The battery died from trying to start it so many times so i know i got to charge it up but i dont know why it would run fine for a while then die.Is there any type of filters that are clogged? or a tune up should be done?Or am i doint something wrong with the choke and the trottle when i start it?I would appreciate any help,info,or suggestions.Thanks Allot!!<br /><br />Phil V

 

[OBJ]

Re: Need Help!! 75"50hp Johnson Engine Trouble

Re: Need Help!! 75"50hp Johnson Engine Trouble

Phil....setting for a year, it's probably got gummed up in the carbs. The gas flowing thru the bowls may have kicked the gum lose and plugged the jets. <br /><br />Here's a thing to try. Put some premix fuel in a spray bottle. Take the carb cover off. Try starting the engine. If it don't start or has a hard time, spray some premix down the carb throats. If she fires and runs, do a carb cleaning and overhaul.<br /><br />I would also check the spark on each cylinder. The should jump at least a 7/16" gap with a hot thick spark.<br /><br />And don't forget to take a gander at the fuel lines. They may be getting hard and losing their grip on connection points.<br /><br />Keep us posted as to what you find and don't hesitate to post any questions...thanks!!

 

[REELSPORT]

Re: Need Help!! 75"50hp Johnson Engine Trouble

Re: Need Help!! 75"50hp Johnson Engine Trouble

My 1969 55 hp did the same thing when I got it. Turned out to be a lot of gunk in the carbs cleaned them and it ran much better. good luck

 

[busta151]

Re: Need Help!! 75"50hp Johnson Engine Trouble

Re: Need Help!! 75"50hp Johnson Engine Trouble

I found out what i think the big part of what the problem was.On my gas tank i didnt have the vent open whiched created a suction that didnt allow gas to go into the engine.I noticed this while i was messing with it after i got home i opened it up and it made this big gassping sound.Then i tried starting it up with muffs on it and it started up fine but i think a good carb cleaing,and a change of spark plug and wires is needed.Thanks For Your Help and suggestions and will keep you guys updated.<br /><br />Thanks Again!<br /><br />Phil V

 

[ryan04]

Re: Need Help!! 75"50hp Johnson Engine Trouble

Re: Need Help!! 75"50hp Johnson Engine Trouble

Hey phil I to have a similar problem right now. I have a1969 55hp rude and I took it out for the first time and it acted the same way. Let me know how it goes! good luck.