I think I have the seadoo from hell!

[73 allen]

Just a question for know, we just got one of our engines rebuilt and in, primed it and the new engine for some reason is taking off and won't shut down even when you pull plug wires. what would cause this and how can this happen on a gas engine?

 

[Nate Surveyor]

Well, maybe the motor is a politician!

(naw, jes kidding!)

What you describe is called "Dieseling". It happens when the motor is so hot, that the engine ignites it's own fuel, and keeps on running. It is most likely caused by a LEAN condition (Lean = HOT).
It is STOPPED by pulling out the choke all the way. This floods the motor with gas, and cools it at the same time.
It is fixed by solving the lean condition, which is usually fuel delivery.

Gray fuel hoses can dissolve into the fuel, and stop up filters.
Filters can be clogged.
Carburetors can have gunk in them.
Tank can be real low on fuel.
Fuel select valve can be clogged.

Be sure you don't run it again, before fixing it. Lean runs with a new motor can score the cylinders, and overheating the rings causes them to loose their tension, resulting in a weak motor.

I hope this helps.

Nate

 

[kustomkarl]

:agree: Nate...about the engine dieseling too...

Karl

 

[Dennis]

Politics

Nate For President!!!!!!!!!!!!!!!
Dawg

 

[Nate Surveyor]

Another cause of dieseling could be lack of coolant to the head, due to a clogged water line, or some malfunction of the cooling system.


"won't shut down even when you pull plug wires."

that is like some politicians!



Nate