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88 60hp VRO outboard issue

G

G man

New member
Hello everyone ,fist time poster here. Had a crazy thing happen to me a while back on first start up of the season. while testing the motor with the muffs on a crazy thing happened , the motor just revved up to full throttle!!, and nothing i did would kill the power . Turning off the key, lowering the throttle had no effect. After 30-40 very long seconds the motor finally shut off. I noticed the muffs had slid away from the position its supposed to be . after checking for anything out of the ordinary I decided to start it up again . Everything seemed to work normally, including the pump which streamed out water. I decided to take it to lake lake for a test run , everything seemed fine until about 10 min or so , at which time the motor just died. tried to restart with no luck . Paddled back to the dock and loaded her up. when i got home I thought what he hell ill give it a crank , and sure enough it started up with like half a crank ?? Im not far from the lake so i decided to try it again , sure enough same thing happen. 2 questions , why would the engine rev up and not shut off like that? and did the first issue possibly contribute to the shutting off problem. Thanks in advance.
 
It is carbon build up on in the cylinders...Pull the plugs and fill the cylinders with seafoam...Let it sit a couple of days and fire it up.

Stop using Pennzoil.
 
The running on issue only happened the one time, my concern now is the shutting off issue until it cools down . Any thoughts on that ?
 
Like Chris said, it could be carbon buildup. Essentially what happens is chunks of carbon get stuck on the head and when they get hot enough they start to glow and create enough heat to act as a spark plug. The result is a runaway engine because as combustion occurs the engine draws more fuel through the carburetor, which feeds the glowing carbon, which combusts........you get the idea.

The only way to stop the cycle is to disconnect the fuel line and eliminate the source of gas.

The solution is to do a deep de-carbonization using SeaFoam to remove these deposits.
 
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