1985 mercury 150hp black max rx2

[George62]

Compression 90s
New plugs
New trigger
Great spark...with gap tester ....1/2 "
Carbs rebuilded
Reeds perfect
Oil mixer ...factory settings
Fule 104 octane
Timming.... idle 8 high 22
Starts good for a 40 yr old motor
Everything checks out good
Could this be a electronic issue like
idle Control
Or fule pump...I think its to Rich
PLEASE HELP ME OUT
Ideas please look at video
Call me if you want 262 348 7952
Idle is set high now to keep running
View attachment 20220604_135529.mp4

 

[George62]

Won't go in to Scream Mode only like 75 % of power

 

[racerone]

Remove a cylinder head and inspect cylinder walls.----Compression values are too low.------Way too much mechanical noise in my opinion.

 

[George62]

Won't go in to Scream Mode only like 75 % of power

I was thinking that

 

[George62]

Remove a cylinder head and inspect cylinder walls.----Compression values are too low.------Way too much mechanical noise in my opinion.

Just had them all off walls are good .
Piston in good shape..just old .
To get compression would have to hone and new rings. Did a running spark test and cuts out a little. That's why iam thinking not all are firing at right time ..no back fire ...just rough

 

[George62]

Just had them all off walls are good .
Piston in good shape..just old .
To get compression would have to hone and new rings. Did a running spark test and cuts out a little. That's why iam thinking not all are firing at right time ..no back fire ...just rough

What iam trying to say is not a Constant spark to all cylinders I don't know if it's a switch Box problem