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1996 EVENRUDE 20HP HELP NEEDED

When you get the rebuild kit, there are probably 3 different gaskets m (part #11).
Compare to the one already on the carb…but also look closely at how the gasket covers, or doesn’t cover, each of the passages. It’s possible that some monkey attempted a previous rebuild, & used the wrong one.
 
Did you select a 9.9 motor by mistake? That’s what my 1996 9.9 calls for.
I see a ‘96 20hp lists QL77JC4 , along with several optional plugs
Part #27
Nope. I went to the MarineEngine.com and the E20CREUM Parts Diagram Page has a link to QL82C "Spark Plug - OEM".

The MarineEngine.com Champion Spark Plug Page does not show QL77JC4 for any year of 20HP.

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“The MarineEngine.com Champion Spark Plug Page does not show QL77JC4 for any year of 20HP.”
Interesting. I see where that came from.
His motor is ‘96. I selected E20CREDA 20 hp (1996), & got this page, which shows QL82C if you select Spark Plug, under COMMON REPLACEMENT PARTS.
If you select, Cylinder & Crankcase, it doesn’t show that plug, but returns QL77JC4, plus 3 others listed as “Optional”.
Part #27
 
“The MarineEngine.com Champion Spark Plug Page does not show QL77JC4 for any year of 20HP.”
Interesting. I see where that came from.
His motor is ‘96. I selected E20CREDA 20 hp (1996), & got this page, which shows QL82C if you select Spark Plug, under COMMON REPLACEMENT PARTS.
If you select, Cylinder & Crankcase, it doesn’t show that plug, but returns QL77JC4, plus 3 others listed as “Optional”.
Part #27
This is the first time I've seen MarineEngine.com have conflicting information. On the spark plug page and the "Common Replacement Parts" list, both links show QL82C. But you are correct, when looking under Cylinder & Crankcase it sure does show QL77JC4. I'll contact the admins and let them know about the discrepancy.

Also, the OP says he has a 1996, but in his very first post he listed E20CREUM as the model number. That's where I got the 1997 info.
1787679998594.png
 
pulling up the ‘97 page,it also shows the same 4 plugs as above, if you use the Crankcase/Cylinder page.
Maybe Champion changed their recommendations, I see the plug page you used only goes up to 1993.
There isn’t much difference between the two plugs, QL is the same CDI resistor & thread size, ones a little hotter heat range, the “4” at the end is “Federal & California wide gap”.
For what it’s worth, I picked up 5 boxes of 4, NOS several years ago of QL77JC4, for $1/plug, & have run them at wide open settings for many hours in a ‘96 8hp & a couple of 9.9s & 15s…showing normal plug Color’s.
The little 8hp has the same set for 5 years now, & 176 hrs on the Hobbes meter.
 
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