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1987 evinrude 140 E140tlcua

E

eathen13@

New member
1987 140hp
1994 javelin 363b 17ft bass boat
6” jackplate set at about 3.5” ptp
19p prop new prop an hub
Compression 120/120/120/118

So I’m having a weird issue going on with my outboard and at this point I’m stumped , it’s starts and idles great , go to take off and plain out it hits a 2900-3000 rpm wall and a couple of times it has stuttered and come alive boat planed out and ran great , stopped and fished and it hits that 3000 rpm wall , squeezed primer bulb and no change , pushed in key to choke it an no change , tried 3 different prop sizes and all do same thing , started testing ignition and got DVA weird reading on one pin of timer base so ordered a new one and a stator while I’m at , replaced and set timing at 18 degrees per manual , still no change and verified link an sync timer is freely turning , I’ve ran boat on portable tank with new line and primer bulb and verified proper vent and no change , list below of what’s been replaced or tests done etc.


All fuel times tank to carbs an pulse line
Fuel pump
Carbs rebuilt
Power pack -Sierra
Stator-oem
Timer base-cdi
Plugs -ql77jc4
Water pump
Thermostats and diaphrams
Grounds cleaned
Ran with timing light each cylinder no difference
Portable tank new lines an bulb no change
Raised jackplate an no changed
Ran 15p prop 19 p prop an same
Disconnected kill switch an no change
Main jets are 59d


What am I missing why won’t it run past 3000 rpm?
 
Does spark jump a gap of 3/8" on each lead?---Orange / blue stripe wires on top coils?------Flywheel key checked?-----Flywheel magnets checked?------Reed valves checked?-----Looked into issues with crankshaft sealing rings?
 
racerone said:
Does spark jump a gap of 3/8" on each lead?---Orange / blue stripe wires on top coils?------Flywheel key checked?-----Flywheel magnets checked?------Reed valves checked?-----Looked into issues with crankshaft sealing rings?
Click to expand...
I have not checked spark in awhile I’m gonna check tonight , , yes blue to the sky , flywheel key is good , I’ve checked flyweel and no magnets looked out of order I’ll remove it put a picture for verification , I have not maybe it’s time I do a leak down test , I’ve sprayed starting fluid all over and didn’t notice any rpm difference
 
racerone said:
Does spark jump a gap of 3/8" on each lead?---Orange / blue stripe wires on top coils?------Flywheel key checked?-----Flywheel magnets checked?------Reed valves checked?-----Looked into issues with crankshaft sealing rings?
Click to expand...
Just did spark test and found one cylinder firing irratically , replaced coil with a Chinese one I had laying around and spark is now consistent , gonna order a set of new oem or cdi coils and go from there
 
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