need help!!!! ready to thro in the hat..

[1fast04neon]

so i have a 97 challenger single 787.. had it for 2 years now, other day had it out on the water it ran good, just rebuilt the rave valves. get back to the house and realize the engine compartment was full of oil, find out the line off the oil tank had cracked all the way down at the bottom, pull the exhaust off and fixed that go to start the boat and see a fuel leak from the carb take it off and the diaphragm had grit on it, cleaned it off put it back together with new carb gaskets and no more fuel leak. started right up......NOW THE PROBLEM. engine idles way high (3000). cant lower it with the adjustments, when i rev the motor it revs out to 7000 uncontrollably,with throttle closed and slides closed it keeps reving only way to shut it off is to choke it, kill switch dosent even work, carbs were rebuilt last season boat has been used many times since and boat ran fine the other day.... any ideas.. sounds like a vacuum leak to me but all lines are good and sealed helppp.

 

[Phildoo]

I get a runaway engine once in awhile. I've heard it can be a seal.
Other guys will chime in soon and get you the info you need.

 

[jhjesse]

Since you just worked on the carbs, my guess is you are sucking air some where around the base of the carbs. More that likely your carb base gasket slipped during reinstallation.

Re check the carb base gasket. If it is not that then check the intake for cracks/leaks.

At any rate you have an air leak some where on the intake. If it races away from you again, just pull the choke.

 

[1fast04neon]

this was happening before i touched the carbs. gaskets look ok they were brand new extra ones i had. i had the carbs rebuilt last season but have used the boat many times since.. do u think that the diaphragm in the front carb could cause this as thats where the fuel leak was from???but its not leaking now that i pulled it off and cleaned it.

 

[jhjesse]

Before or after...the symptom is still the same. There is an air leak somewhere causing a very lean condition. You need to find it before it does some damage.

Try starting it and let it idle. Spray some WD40 around the base of the carbs and see if the RPMs increase while you are spraying. If the RPMs increase suddenly, then you have found your leak.
If you don't want to do that, then I would take the carbs off and check the gasket, as well as, the intake. Look for cracks, warping, or loose bolting.