Engine Problems!

[andreworiordan]

Got a 40hp Mariner XRNLI (2004) the engine is running fine, when i start it up its perfect but as soon as i put into gear she runs for a min but when i power up she dies off, i cant get full trottle..its like the engine is stopping itself from running at full trottle...well anything over tick-over speed. i first thought it may be fuel problem but the fuel appears to be ok, then i thought spark plug problems but the appear to be ok....anyone know what it may be...im going to get it serviced on wednesday but im trying find out what is going on....thanks guys!

[PeterR]

Have you undone the breather screw on the tank

[Pete7]

Blocked jets in the carbs or reeds stuck because the fuel has evaporated and left a sticky varnish substance behind. Let the dealer sort it out.

Pete

[PeterR]

Could easily be fuel starvation

[andreworiordan]

when the engine is in idle, it will run all day, its only when you put it in gear and give it power. sometimes it runs fine but for the most part it dies and you must bring it back to idle, only have the engine on the boat 2days and only been out a few hours yesterday and today. thought it might be sparkplugs because it started todie, i took off the cover and ratteled the plugs, she ran fine for like 5min and then started to die again.

[PeterR]

I seem to remember the timeing advances on the fly wheel when you accelerate maybe this has come adrift.Two strokes are very simple so should be easily sorted out.As long as you have trust in your dealer.But it is good to have an idea yourself

[codprawn]

I also think it's fuel starvation - either a blocked breather or filter.

[Tim M]

I had a similar problems with a 1998 Mariner 40 2 stroke. It turned out to be blocked jets - as Pete says. Quite a simple job to sort out.

[andreworiordan]

...how hard are these to clear? am i better off getting a service or is it possible to do it myself, are there other tell tales of blocked jets that might confirm they are blocked?

[Nos4r2]

If you're not sure what you're doing with it, take it to the dealer. If you separate the carbs and mess up the synch it won't run right. It's probably minor but if you do it wrong it'll cost you more to pay someone to sort a mistake... and yes, it sounds like blocked jets or sticky reeds. Could also be water in the carbs.