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PostPosted: 22 Jul 2016, 06:49 
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Joined: 16 Feb 2016, 13:20
Posts: 590
Location: Dearborn, Manton Michigan
wmk0002 wrote:
perchjerker wrote:
it will tell you whether or not is it firing at all. If it is not you know you have an issue.

its not the best test for the strength of spark but its still useful information

at least it has been for me in my 20+ years of wrenching for a living


True. Got me there.


don't get me wrong, the spark tester is a good idea. I may get one at some point.

I can get a good feel for the strength of the spark just by looking at its characteristics, a bright blue spark with a "snap' to it indicates a strong spark, a weak yellow wimpy spark means there are problems.

But then I have been at this a long time



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my build 1976 14ft Meyers V hull

viewtopic.php?f=21&t=40127
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PostPosted: 22 Jul 2016, 14:27 
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Joined: 17 Jun 2012, 11:27
Posts: 121
Location: KCMO
turbotodd wrote:
If the idle screw is backed all the way out and it still idles, it likely has an air leak somewhere. Suspect an o-ring or gasket between carb and intake manifold, or between manifold and cylinder head.

And by the way, the correct way to check for proper spark is to get a friend who doesn't know any better and have him/her hold the spark plug while you crank it. :D

I just ordered new gaskets for the intake, and both sides of the carb



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1958 14' Crestliner Viking 15 Mercury 4S viewtopic.php?f=21&t=33307
1969 14' Starcraft 15 Evinrude 4S viewtopic.php?f=21&t=38929
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PostPosted: 24 Aug 2016, 09:50 
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Joined: 17 Jun 2012, 11:27
Posts: 121
Location: KCMO
Well, finally got the parts together. I replaced the needle valve, two gaskets on the carb, gaskets between the carb intake, and intake manifold last night. When I pulled the carb apart I noticed that the float was hitting the top of the carb as I had it upside down. I take it this means the needle wasn't closing. Would the needle not closing cause the problems im having? I haven't had a chance to run it, but I will SOON!!! It was idling on its own, but seemed to idle rough, and dogged down when I went about 50% throttle. I hope, I hope, I hope that was the problem....Tell me that was the problem!! :shock:



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1958 14' Crestliner Viking 15 Mercury 4S viewtopic.php?f=21&t=33307
1969 14' Starcraft 15 Evinrude 4S viewtopic.php?f=21&t=38929
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PostPosted: 30 Aug 2016, 17:28 
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Joined: 17 Jun 2012, 11:27
Posts: 121
Location: KCMO
Well I was a little bummed at first, I ran the motor, and it was still running rough. I decided to replace the plugs, and started it up...purred like a walrus at idle!!! Only problem is It wants to die when I try to increase the throttle. If I wiggle the throttle back and forth, I can get it to go into the higher RPM's, but but it has a spot right above idle where it wants to die, any thoughts?



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1958 14' Crestliner Viking 15 Mercury 4S viewtopic.php?f=21&t=33307
1969 14' Starcraft 15 Evinrude 4S viewtopic.php?f=21&t=38929
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PostPosted: 01 Sep 2016, 10:10 
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Joined: 17 Jun 2012, 11:27
Posts: 121
Location: KCMO
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1958 14' Crestliner Viking 15 Mercury 4S viewtopic.php?f=21&t=33307
1969 14' Starcraft 15 Evinrude 4S viewtopic.php?f=21&t=38929
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PostPosted: 15 Jan 2017, 18:14 

Joined: 10 Jan 2017, 09:43
Posts: 2
This may sound rather simple, but, is the vent screw open in the fuel tank cap? For proper fuel flow you need ventilation in the fuel tank to avoid a vacuum in it. Fuel won't flow well or not at all in a vacuum. It happened to me, it can happen to you. My 9.9 four stroke Mercury kicker acted just like yours while in a Walleye tournament on Saginaw Bay. I about to head back to the dock. Then suddenly I noticed the vent screw was down. In less than a minute I was back to troll speed. Best wishes.


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