I apologize if this is double posted- newbie to forum.
Bottom Line Up Front:
before carb rebuild, had normal smoke at idle
after carb rebuild and careful tuning per OEM manual, excessive smoke at idle, but runs great.
What's the problem? careful to measure 50:1 and carb needles are about 3/4-7/8 turn out.
Details below.
thank you!
Am stumped on what seems to be an easy fix Evinrude 50 HP EVINRUDE 1993 VE50BELETB
Motor is a great runner.
It's life is putt, putt, putt, on back of a pontoon.
Smoked a little at idle, which is a good thing. No smoke at higher rpm.
But, motor started to die at idle mid summer.
Rebuilt fuel pump. No joy.
Replaced primer bulb, then connectors, then hose on tank-to-motor supply line. No joy.
Removed and inspected carbs-nice and clean. But did fine one of the coned, core plugs was loose in the bowl, lower carb. Went ahead and rebuilt carbs w/ new rubber gaskets, jets, etc.
Tuned the carbs, timing, idle etc. per OEM manual.
Low idle needles are about 3/4 turn out each. this seemed low per spec, but was close to what the previous settings were prior to motor issues.
Now, purrs like a kitten, runs like a top, but
much more smoke at idle than before this incident, and
"seems" to consume more fuel.
Bulk of exhaust smoke comes from the rear exhaust port above water line which also spits water (normal)
Solid stream of water from outlet pigtail (normal).
Some but little smoke emerges from the water surface from the exhaust coming thru the prop hub.
Mixture Ratio:
Carefully measured fuel to oil of 50:1.
Used same Valvoline synthetic -w3 oil as before (w3 is smoke level?)
Idle settings too rich:
Readjusted low idle needles on carb a bit to see if it changed the smoke level- no joy. Reset them back around 3/4 turn each to return the motor back to purr at idle.
Gasket leak between power head and inner exhaust housing:
I would expect to hear a loud exhaust noise and also smoke from inside the engine cowling- nonesuch.
Exhaust relief baffle leak:
blue smoke and water spittle coming from the exhaust grommet (normal)
Well you can see I am grasping at straws here.
I'll buy craft beer for good advise; maybe commodity beer one for some decent advise; and a light beer for any advise.
Thanx in advance and best regards,
signed ...in a daze and cloud of smoke here in Central Pennsylvania
Bottom Line Up Front:
before carb rebuild, had normal smoke at idle
after carb rebuild and careful tuning per OEM manual, excessive smoke at idle, but runs great.
What's the problem? careful to measure 50:1 and carb needles are about 3/4-7/8 turn out.
Details below.
thank you!
Am stumped on what seems to be an easy fix Evinrude 50 HP EVINRUDE 1993 VE50BELETB
Motor is a great runner.
It's life is putt, putt, putt, on back of a pontoon.
Smoked a little at idle, which is a good thing. No smoke at higher rpm.
But, motor started to die at idle mid summer.
Rebuilt fuel pump. No joy.
Replaced primer bulb, then connectors, then hose on tank-to-motor supply line. No joy.
Removed and inspected carbs-nice and clean. But did fine one of the coned, core plugs was loose in the bowl, lower carb. Went ahead and rebuilt carbs w/ new rubber gaskets, jets, etc.
Tuned the carbs, timing, idle etc. per OEM manual.
Low idle needles are about 3/4 turn out each. this seemed low per spec, but was close to what the previous settings were prior to motor issues.
Now, purrs like a kitten, runs like a top, but
much more smoke at idle than before this incident, and
"seems" to consume more fuel.
Bulk of exhaust smoke comes from the rear exhaust port above water line which also spits water (normal)
Solid stream of water from outlet pigtail (normal).
Some but little smoke emerges from the water surface from the exhaust coming thru the prop hub.
Mixture Ratio:
Carefully measured fuel to oil of 50:1.
Used same Valvoline synthetic -w3 oil as before (w3 is smoke level?)
Idle settings too rich:
Readjusted low idle needles on carb a bit to see if it changed the smoke level- no joy. Reset them back around 3/4 turn each to return the motor back to purr at idle.
Gasket leak between power head and inner exhaust housing:
I would expect to hear a loud exhaust noise and also smoke from inside the engine cowling- nonesuch.
Exhaust relief baffle leak:
blue smoke and water spittle coming from the exhaust grommet (normal)
Well you can see I am grasping at straws here.
I'll buy craft beer for good advise; maybe commodity beer one for some decent advise; and a light beer for any advise.
Thanx in advance and best regards,
signed ...in a daze and cloud of smoke here in Central Pennsylvania
