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How are you going to cool exhaust tube and housing?

Bore size is 3.501 and piston 1/2" on skirt is 3.494 +/-.001. If bore measures 3.504 or larger it needs rebuilt

How did you know VRO pump failed?

Dont use your fingers to try and pull it off as the magnet force is great and can actually pinch the finger tips off...

Magnets must be in place for the EMM to work properly and fire injectors. Find the PROPER flywheel and replace.

Tis a 1983 model, needs all 4 hose and the tilt limit bolt as it bottoming out on cylinder

All you should need is a 3ft washing machine supply hose .

Only difference in rods is bolt size(3/8vs 5/16) possible piston size(.100) and would account for block difference.

Yes....

I see you got it running, so UPS delivered :)

Wont work as carb circuits different to match throttle body

Swap the red and blue stator wire between switchboxs, if problem follow its a bad stator, if not it a bad switchbox and replace in pairs only. No cheap Amazon junk.

The pic you posted of it on motor, it is installed correctly, and hose needs trimmed shorter.

Also swap the signal wire (green) off switchbox to a different cylinder.

Make sure they replace all 6 pistons

Mind If I ask the rebuilder?

I have sold and installed close to several hundred WSM pistons as dealer for em. Only had one that failed due to MFG defect as locater pin came out.

Mercury outboards have not used a "mercury filled" switch for on engines above 100HP for around 25+years. If it has the red stator thats most likely the culprit as they where POS

The AXX number at the end is just a series number. As long as part# is the same it will work.

If it has the tilt limit switch check for pinched wire at cowl