75 evinrude 9.9 not firing

1

105mich

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May 21, 2017
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I have a 9.9 evinrude from 75 that will just not fire at all. I have gone through the entire ignition system and confirmed good spark on both cylinders.

Cleaned the carb and confirmed bowl is filling and giving fuel
Compression is 82 psi on both

It does not even sputter, I have even dumped fuel into the cylinders and no firing

Could it be bad reeds? I can see one of them through the intake and was able to move it with dental tools, it was normally closed, but could it be bad still and staying closed?

After dumping fuel down it eventually dripped out the exhaust and was sooty and black
 
R

racerone

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Dec 28, 2013
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With fuel in the plug holes it should bark like a wild dog.-----Switch the plug wires.-----And reed valves have nothing to do with compression is the cylinders.
 
jimmbo

jimmbo

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82 psi sounds a bit low.
Good Spark? Can it jump a Gap of 7/16"? If not, the Spark is Not Good
 
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105mich

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May 21, 2017
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Yes spark is good, its jumping the gap on the plugs and on the tester. Only reason i jumped to reeds was i believe the spark is adequate
 
jimmbo

jimmbo

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105mich said:
Should I gap the plugs to 7/16" and see if it still jumps the gap?
Click to expand...
You might as well Break the Electrode Off, and it is unlikely the Gap between the Center Electrode and the Wall is even that wide/
Get a Spark Gap Tester(damn, can't post a pic of it)
Get some wire, a block of wood, a couple of screws and you can make one.
 
T

tphoyt

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Jun 10, 2010
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Maybe you have dumped too much fuel down the carb. Pull the plugs and turn it over a few times to clear the cylinders and try again.
Is this a new to you motor?
 
1

105mich

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I did find out the wrong plugs were in it. Have since installed champion L86Cs, but no change, nice blue spark when plug is grounded on block, but no start, even with fuel in cylinders.

If the reeds are stuck closed, could that stop air from getting in the cylinders?
 
T

tphoyt

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Have you tried switching the plug wire as mentioned before?
If so pull the flywheel and check the key to be sure it’s not sheared.
 
T

tphoyt

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I have to ask as it’s important to know. Did you pull the flywheel or just the nut to check the key?
A lot of people will just take the nut off and look and assume all is well and that doesn’t work.
Or they will not torque the nut when they put it back on and then it shears. No disrespect we just need to know.
Have you seen this motor run or did you get it this way?
 
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