outboard help

[hollygolly]

hi easy fish
According to evinrude it is 50:1, but i am going to put some new fuel in the tank to eliminate fuel issues, and will try some better octane shell fuel rather than the supermarket crap. if anyone else feel my mix is incorrect please advise.
Peter

[Kev1n]

hi kevin.
Choke is free and butterflys are even when closed. All filters are clear, recently put in line filter just before fuel pump, bulb keeps good pressure once primed. Fuel lines seem OK did cut one as it had a small crack in it at conector, and i did at one point change the "T" connector when it broke in two (thought that might have been the cause actually) have not checked for blockage at exhaust side mind, all seems ok, is there a certain way to do this?
Thanks
Peter

From what you’ve told us, you’re giving the engine a thorough checking over so I’m sure you’ll get it sorted. Sorry I cannot help with any info on checking the exhaust short of a full strip-down which is too severe to suggest yet.

[Kev1n]

Another couple of thoughts. I guess you’ve checked that the air intake is breathing OK.
Could you try pumping the fuel bulb whilst opening the throttle? If the engine problem remains then your fuel pump and lines are probably OK. If the problem goes away, it is a fuelling issue, possibly a dodgy pump or air leak. If it gets worse it suggests you may have a carb problem. You may also spot any fuel leaks from the lines, pump or carbs.
I’d run the 1:50 mix until you get the problem sorted; if the problem is fuelling it will also affect the lubrication that the fuel brings with it.

With that lot checked out, I’d go back to the electrics and check how big a gap the spark will jump. It can look OK on the plug but be weak if the coil or HT leads are on the way out. The timing and advance may need checking too.

[codseeker]

all these ideas sound like my bag o cr@p 25hp mariner it runs at decent pace on a flat sea but yet when it gets a wee bit choppy it wants to cut in and take off at proper speed and cut out i know the way its running when slow its not right and using twice as much fuel at this pace any ideas lads

this is the right speed im sure it shud be doing port logan last summer ... but on a nice flat day the day before east tarbet at the mull it didnt go that fast pmsl
click n play image

[canman]

Just a silly thought Peter, is the throttle control working ok from the remote gear lever! ie; it's opening both carbs together. I'm assuming the control box has a single lever gear/throttle, and a separate idle tick over control lever.

[beachbuddy]

all these ideas sound like my bag o cr@p 25hp mariner it runs at decent pace on a flat sea but yet when it gets a wee bit choppy it wants to cut in and take off at proper speed and cut out i know the way its running when slow its not right and using twice as much fuel at this pace any ideas lads

this is the right speed im sure it shud be doing port logan last summer ... but on a nice flat day the day before east tarbet at the mull it didnt go that fast pmsl
click n play image

By trev were you going for the port Logan speed record youngin good wake out the back,thought I wud have seen you on your boogie board

[hollygolly]

hi can man
yes the throttle lever is all in sinc all 3 carbs butterflys open and close together.
peter

[smoggie]

whats the telltale like

Overheating ????

[Joe-m]

Hi mate you might have checked this but if its any help when you first open the throttle you only advance the timing on the flywheel then your carbs open if your timing's wrong it will stall when the load comes on the prop , sometimes the coils breakdown it will have 3 on a 3 pot run it as hard as it will go and check the plugs they should be dry if 1 is wet its not firing on that pot hope you get it sorted for the summer

[hollygolly]

hi joe-m
I had thought about the timing, and am currently trying to get a timing strobe to check it. All 3 pots are firing well, but i also noted the last time i checked it that there was a dark wet substance on the plugs, but i am sure it was on all 3 and therefore thought it was unspent fuel or oil?
Thanks

[Joe-m]

Hi it will be oil, if you are running at the right mix on that engine probably 50:1 unless it is oil injected they often get oily at low speed that,s why 2 strokes don't like trolling much the newer models are a lot better but running at decent revs they should be a light sandy brown and dry check you have got the right temperature range a cold plug will oil up check the number on the plug is right, take the hood off and check that when you first open the throttle only the timing moves you can see the linkage move then the carbs should start to open good luck