dish
Petty Officer 2nd Class
- Joined
- Aug 22, 2008
- Messages
- 151
This ones got me!!! 1989 50hp yamaha 2 stroke.Just got this thing on a project boat.History was owned by old guy from new and has 200hrs on it.
Got it home,compression tested it! all cylinders 130psi.
Next i pulled the head!! No corrosion at all so on went a new head gasket,new plugs etc.
Next i changed impeller,gear oil! all good,pumps good water.
Stripped and cleaned carbs,new float needles,gasket etc etc
Pulled all the wiring off and checked connections for corrosion and made sure all the earths were good.
Ignition coils are good! Stator looks like new!!
Heres the thing!! In idle it will run for exactly 30 seconds and then just die.
She will start straight back up every time and die after 30 seconds!!
Anything over idle and she will run all day.
Checked the fuel pump and the diaphram has no splits and looks good.Also put a clear hose on after the pump and didnt have any air leaks going to the fuel rail.
Could the CDI be faulty at idle??? Its the one with the metal timing dial on the front of the CDI unit.
Any advice would be highly appreciated because this one has got me stumped!!!
Also if the idle timing was off would that cause it to run for exactly 30 second then die?
Got it home,compression tested it! all cylinders 130psi.
Next i pulled the head!! No corrosion at all so on went a new head gasket,new plugs etc.
Next i changed impeller,gear oil! all good,pumps good water.
Stripped and cleaned carbs,new float needles,gasket etc etc
Pulled all the wiring off and checked connections for corrosion and made sure all the earths were good.
Ignition coils are good! Stator looks like new!!
Heres the thing!! In idle it will run for exactly 30 seconds and then just die.
She will start straight back up every time and die after 30 seconds!!
Anything over idle and she will run all day.
Checked the fuel pump and the diaphram has no splits and looks good.Also put a clear hose on after the pump and didnt have any air leaks going to the fuel rail.
Could the CDI be faulty at idle??? Its the one with the metal timing dial on the front of the CDI unit.
Any advice would be highly appreciated because this one has got me stumped!!!
Also if the idle timing was off would that cause it to run for exactly 30 second then die?