Mariner 2stroke 60hp problem

[matt_sa]

Hi we have a problem with the 2001 mariner 2 stroke 60hp on our rib. The engine will fire, however will only run for a few seconds before dying even if we lift the idle to make the revs higher, it still dies. We thought it could be water in the fuel and drained the carbs through and emptied the filter, this hasn't fixed the problem. Can anybody shed light on this? Thanks

[RIB-Teccie]

Check the basics first.

1) does fuel bulb prime up firm or just keep pumping fuel into engine or leak from carb? It could also be fuel pump.

2) you may have dirt in the carbs.

3) Do you have spark on all cylinders. It may be off a pot.

4) is the compression ok?

5) I assume the timing has not been changed.

I think your engine is off a cylinder. Try running each cylinder on its own this will show you which one.

The bottom crank seal may also be blown, that would give similar symptoms.

Once you are satisfied the problem is not fuel, then I'm afraid the electrics or sealing have to be suspect.

[matt_sa]

Thanks very much for your help

[9D280]

Things that might narrow it down -

- How quicky does it die? - "fade out" or instant like someone pulled the deadman?
- does it last the same amount of time before death each time?

Some other thoughts:
- If it's electric start is the choke going back when you let it go?
- Is it a clamshell? They had a "richening device" rather than a choke - so all the usual stuff to make engines start gets turned on it's head!
- your fuel tank vent is open?

[matt_sa]

Sorted now thanks

[A1an]

Want to let us know how you sorted it?

Handy for people that search the forum for a similar fault.

[matt_sa]

Not sure exactly how but we cleaned the carbs and the found it was only running off one spark plug wherever we put it, so we sorted that with 2 new plugs and then it was better but still didn't work, then the kill cord lead was changed and seems to have done the trick!

[Pedrode]

I would change the third plug as well. If two were done, the third won't be far behind. Intrigued by the kill cord thing. If the kill switch is working, the engine shouldn't fire at all so not sure that was part of the fix.