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That is the one you want.

Pretend all you want.

Carbed 4 strks are 10x worse than 2 strks. To meet emissions the the idles are leaned out so far they are prone to plugging up the jets. That is common knowledge and a lot of times carb replacement is mandated. So no they are not the same as 2 strks.

Nope your wrong

Nope your wrong

Any 4 strk with a carb will be a maintenance nightmare.

The smaller Mercury engines have it off of the thermostat.

1100 rpm on muffs is normal

Xp/gt 100 motors are prop rated 115s. Same as the 110/112 blocks but smaller csrbs.

The 110/112 blocks have bubblebacks on them.

Try to find a late 80s 115/110/112 motor. They are the prop rated versions of the 140

Remove the kill switch completely and use the choke to kill it. You cannot use an ignition to ground kill switch on that motor. That is probably a phasemaker ignition and it will get expensive fast

Points and condensers need to be checked.

That is for the newer style carb wont work on OPs.

Do you have the round carb? You need this kit and they are still available. 18-97355 - Carb Kit, Mercury 1399-8153

You cant test the fuel pump on that motor with a gauge. The pump is part of the carb.

The spring gets set up to always put pressure on the red arm towards the starter sheave. One end will go around the tall metal tab.

Get a manual

Is the carb base gasket on correctly?

Looks like Tilt and trim colors. Follow them back and see if they go to the relays.