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Runaway 951


drjack

Premium Member
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Location
London On
Water Crafts
2001 Sportster LE 951C
1983 Nonsuch 26C
#27
I had an issue with the carburetor gaskets.
Two years ago I installed 2 new gaskets and was certain the carburetor mounting bolts were tight. But the 951 motor still had a tendency to rev high. Just recently, I rebuilt the carbs again, and after removing the gaskets to inspect, I found there was a small area of the gasket where the gasket appeared to have no impression. There was my small air leak.
I located another set of carb gaskets that were a bit thicker and more surface material. Instantaneously, the idle settled right down to normal....actually had to adjust to increase idle speed as it was too low.
 
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48
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1
Water Crafts
2000 seadoo rx
#29
Carb has been taken off set to to factory specs by a marina and put back on still same problem they told me they don’t know what’s wrong with it
 

jhjesse

Well-Known Member
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2,626
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70
Location
georgia
Water Crafts
2000 GTXDI 2002 RXDI
2009 RXTIS
Two 2001 GTXDI's
#30
Cracked intake, bad intake gasket, bad seal around reed cages, etc. it’s sucking air somewhere.
Sure the throttle cable is set properly?
 
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Water Crafts
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#31
If you look down inside the carb throats with plenty of light, can you confirm both throttle butterflies are near 99% closed, or is one open partially?

I find it difficult to believe any air leak could result in 6,000 RPM in water, such an engine speed would propel the hull into the mid 40MPH range and this takes plenty-o-fuel to make happen.
 

mikidymac

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1,123
Location
California
Water Crafts
2003 GTI
2001 XP
1996 XP
1996 HX
1991 Superjet
2001 Superjet
#32
A runaway will not happen in the water. If it’s going to 6,000 rpm in the water your throttle is being held almost wide open.
 

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