50HP Mercury Blueband - year?, cutting-out

[simonreed60]

Just aquired boat with this engine - new to outboard motors. Serial number is 4280459. No idea of year can anybody help or point me to where I can find out.?<br /><br />Engine has been unused for about 2 years. Started well on dry land and gave it its first shake down on sea last week with new petrol/oil. Ran well at top end for a while then seemed to die a couple of times and didnt like going slowly with poor pick-up.Started ok again after about a 5min wait Throttle stiff as well.<br /><br />Any advice for getting it back in shape. I am fairly capable but as yet no manual - any service guides posted on web? I also notice a vent and flush screw on prop - how does one go about using these and for what purpose?<br /><br />Thanks for help.<br />simon

 

[mellowyellow]

Re: 50HP Mercury Blueband - year?, cutting-out

welcome aboard,<br />start with petrol, was it fresh 50:1 mix?

 

[simonreed60]

Re: 50HP Mercury Blueband - year?, cutting-out

mellowyellow,<br /><br />Thanks<br /><br />My thought as well! petrol and 50:1 mix all fresh and new that day.

 

[Hank 911]

Re: 50HP Mercury Blueband - year?, cutting-out

Simon try this: http://www.marineparts.com/partspages/techhelp/TECH15.HTM

 

[Greg New Zealand]

Re: 50HP Mercury Blueband - year?, cutting-out

Hi Simon<br /><br />Blueband 500 (50,0) 4141000 - 4357639 1975 4 cyl.<br /><br />I have a '77 model. Great motors! Mine had been sitting for 3 years when I bought it Nov 2003. Start with a compression test.<br />Get a manual (can't work without one) and start with new plugs and a decarb. Check the carbs for fuel leaks and you may need to rebuild these. Replace the water pump impellor. <br />Make sure that your fuel mix is right at 50:1. Plugs do foul up with too much oil. Keep posting.<br /><br />Greg

 

[simonreed60]

Re: 50HP Mercury Blueband - year?, cutting-out

Hank/Greg,<br /><br />Thanks for help so far. At least I know the year now!Manual a must I agree - looked on amazon for the book I think I need but seems difficult to get!?<br /><br />Once I get manual will keep you posted.<br /><br />ps. What sort of top speed on a 14ft ski-boat could you expect from it Greg - motor does seem to have lots of potential<br /><br />Many thanks<br />simon

 

[Hank 911]

Re: 50HP Mercury Blueband - year?, cutting-out

Simon My 17 ft. bass boat has a 75 Hp. Mercury and it will do 38-40 mph. I think this might be a ball park number for your set up as well. Maybe someone has a more similar set up and can put you a little closer. I have used Clymer and Seloc manuals and they are a poor substitute for a factory service manual. I recently ordered one from these people and had it in 3 days: http://marineengine.com/manuals/mercury/index.html

 

[Greg New Zealand]

Re: 50HP Mercury Blueband - year?, cutting-out

Hey Simon<br /><br />My boat is a 13'6" glass runabout - does 35 -37 mph on my Navman sounder. Haven't had a GPS on board yet. Motor is a real sweetie. I expect that you should get 30-35 mph depending on your hull shape and setup.<br /><br />Greg

 

[dajohnson53]

Re: 50HP Mercury Blueband - year?, cutting-out

Thanks for help so far. At least I know the year now!Manual a must I agree - looked on amazon for the book I think I need but seems difficult to get!?<br /><br />Once I get manual will keep you posted

go to www.mastertechmarine.com - they'll have owner's and shop manual for you. Not affiliated, just a happy customer.