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#1
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Either One Fits.
Actually crap in pants Due to replacement powerhead. And to think the manufacturers really don't want the owners to exceed 1500 RPM in neutral due to the chance of chatter on the rod bearings without a load. 
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#2
03-22-2011, 05:52 PM
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I've talked to several people about it. best idea we could come up with is once the engine was at a higher rpm( it ws at fast high idle) with no load, it started dieseling. Cutting the engine off(same as pulling the kill switch) would just short out the ignition, but at this point it was running with out spark, kinda like the top fuelers do when the ignition fails. the engine kept getting to higher rpm, i was fumbling with the throttle, couldn't figure anything out, so i grabbed the fuel line and kinked it closed. I kept fiddling with the linkages, trying to get the rpm down, when it finally started slowing down as it used up the fuel in the bowls. I really don't know exactly what stopped it, I was doing three or four things at one time when it started slowing down. i never seen one do it before.
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#3
03-22-2011, 06:07 PM
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could something happen with the fuel system from the long tow down.
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#4
03-22-2011, 06:22 PM
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I don't think that would have anything to do with it unless the tank vent was clogged. The only other thing that concerned me was afterwards, the primer bulb would not prime up hard with the engine off. It may have been drawing fuel thru the venst froma stuck needle or posible thru the fuel pump diaphrams
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#5
03-22-2011, 09:55 PM
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I had an old Kawasaki jet ski that would do that when being flushed on the trailer with no load. I had to cut the fuel to get the dang thing to quit. It would idle up pretty high and pretty much scare the crap out of anyone nearby.
__________________
1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 1979 Marine Trader 44, twin Ford Lehman 120s 2006 Panga 14, Tohatsu 20
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#6
03-23-2011, 10:58 AM
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Quote:
i had a Kaw 550 Standup that did that right often when the timing was off, i aways killed it but covering the carb so it got no air, it turned out the timing was off by 4* doesn't sound like much but it fixed it once timing was set.
__________________
 1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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#7
03-22-2011, 10:41 PM
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Quote:
As you had to kink the line to kill it, wonder if the line has now been compromised and needs to be replaced...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#8
03-23-2011, 09:44 AM
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Quote:
__________________
1986 V-20 1986 Yamaha 150 HP
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#9
03-23-2011, 10:56 AM
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RWilson, I think Spare was trying to say that a plugged fuel tank vent coupled with the engine sucking fuel out of the tank would create a vacuum and prevent the primer ball from functioning properly.
I want to hear more on the dieseling theory. What would get hot enough in such a short timeframe to cause it, carbon, the spark plug itself? AND Would a lean run condition cause it to rev up worse? I know when I run my 2-strokes out of fuel the RPM's pick up just before they shut off. Could the motor have been choked off by pushing the key in? What a crazy thing. If that happened in gear, in Shem Creek, you wouldn't be able to take it out of gear and the results would have been interesting to say the least.
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#10
03-23-2011, 11:00 AM
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Quote:
motors won't do that under load the load kills them.
__________________
1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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