first thing is to get a manual and compare results to specs. it may flag a problem more than swapping or guessing but... ex: see sect 3.59 on injector electricaland physical tests and..NOID lamp checks
download this manual...
fwiw from an intelligent source... things to reverify ....
If it fired briefly right after the new amplifier was installed, then died and now won’t restart, the most likely causes are:
Most likely causes
1. Loose / bad electrical connection (very common)
After changing the amplifier:
a...
spray some fuel in the carb while it cranks... if it fires up you have a fuel flow issue ... cylinder (s) not receiving fuel.
the very worst possibility is that an electrical problem is killing the amplifier (coil) .If so the cause must be found before invetsing more $$$
Those power packs seem to be a frequest suspect...maybe heat related..
when the problem comes up you could try a freeze spray to see if cooling a specifc component suddenly clears thins up. Cheaper than guessing or swapping expensive parts. Keyboard air spray at the Dollar store is cheap...
problem of it idling poorly after warming up has never went away
idling on all these oldies from cd fd qd etc...relies on drawing (sucking) fuel from the lower carb bowl via a very narrow side channel. Your carb model uses a air "orifice plug" instead of the old easy to adjust pointy...
comment from an intelligent shource
A 1987 Evinrude E50TLCUD bogging down is almost always caused by fuel, air, ignition, or exhaust issues. On that era of 2-stroke outboard, a few causes are especially common:
🔧 Most likely causes
1. Fuel delivery problems (very common)
Dirty or clogged...
flip the engine upside down an drip some release agent down the shaft to reach the PH
let it seep in a few hrs and retry. tapping on the drive shaft from the other end with a wood block/hammer may break a rusty bond in the PH.
cav plate looks like it is lined up with the bottom so you should be OK with the weight of both motors hanging on the back... check for a good pee stream if motor has one .
motor down may help steering in windy situation I run motor down .....with no linkage on my set up I use the big...
thanks I got 2 similar 3.9hp and one XL sailboat boat version of the 4hp (apparently a more rare version) but no sailboat :) Got to get rid of some plus several E/J 4hps ..... ...the shed is filling up
