Just removed a Yamaha 50 2 stroke DETO from my back yard after 6 years or more stored without use in all weathers.
It started and ran beautifully (I drained the carbs before storing it and flushed out pump and pipework with new fuel before starting it).
It was put away working.
However... It only runs for about 30 seconds then stops. It does not stop in a fuelly, hesitant way. It stops as though switched off at the key, so as though the ignition has been removed immediately from all 3 cylinders. It starts again fine on the key and runs for a similar period.
1) Is my suspicion about the type of stalling likely to be enough to go on- or should I invest in a spark tester. I think it will be hard to see if it is removal of ignition this way, because the moment ignition is removed the engine will stop and any spark tester will stop lighting up at the same time. Or is there a delay that will be noticeable; the spark stops then the motor stops shortly after? I ask because I've never owned a spark tester. To clarify it's not the cost of the tester that bothers me (less than £5 on ebay!), it's the waiting around for it to come in the post that I wish to avoid if I don't really need it.
2) Any suggestions of obvious things to check first? The motor was put away working. Are there bad earths etc. that commonly cause such issues on these engines?
3) I'm hoping it's not the CDI.
Due to the fact the issue has come up after it has been stored in damp outdoor conditions I strongly suspect a coroded connection somewhere- but where should I be looking first?
It started and ran beautifully (I drained the carbs before storing it and flushed out pump and pipework with new fuel before starting it).
It was put away working.
However... It only runs for about 30 seconds then stops. It does not stop in a fuelly, hesitant way. It stops as though switched off at the key, so as though the ignition has been removed immediately from all 3 cylinders. It starts again fine on the key and runs for a similar period.
1) Is my suspicion about the type of stalling likely to be enough to go on- or should I invest in a spark tester. I think it will be hard to see if it is removal of ignition this way, because the moment ignition is removed the engine will stop and any spark tester will stop lighting up at the same time. Or is there a delay that will be noticeable; the spark stops then the motor stops shortly after? I ask because I've never owned a spark tester. To clarify it's not the cost of the tester that bothers me (less than £5 on ebay!), it's the waiting around for it to come in the post that I wish to avoid if I don't really need it.
2) Any suggestions of obvious things to check first? The motor was put away working. Are there bad earths etc. that commonly cause such issues on these engines?
3) I'm hoping it's not the CDI.
Due to the fact the issue has come up after it has been stored in damp outdoor conditions I strongly suspect a coroded connection somewhere- but where should I be looking first?