1990 60hp johnson
senario is ;
It'll idle on muffs, in a test barrell and in the river
It'll run in gear on muffs (not to be done i know) ,
it'll run in gear in a test barrell
It WON'T run in the river once throttled is applied it'll just die out.
What has been done and checked and rechecked is
Carb's rebuilt inc welch plugs (carbs taken apart several times to be checked), premix sprayed in and intakes covered to see if any chages happened but nothing.
new fuel lines ,
pump inspected and disassembled ( no leaks)
Good spark tested with air gap of 1/2"
Cylinder drop test carried out and is even results across all 3
good compression, head was even removed last night to make sure no water intrusion just to be sure.
Lync and sync done too many times to rememeber
It'll troll in gear at it's lowest speed, but once power is applied it'll die. have tried pumping the bulb to rule out the pump and it still happened. That's why i questioning if it's an exhaust issue and maybe it's smothering itself somehow?
It'll rev up in the river in neutral but once i put it into gear and go past idle it'll die .
Please help am at my wits end with this thing now.