1967 Johnson 80hp backfires when I mist fuel into carb

yorab

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Joined
Jul 6, 2002
Messages
960
Re: 1967 Johnson 80hp backfires when I mist fuel into carb

My fingers are crossed for ya too.
 

BonairII

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Jun 7, 2011
Messages
2,727
Re: 1967 Johnson 80hp backfires when I mist fuel into carb

Update:
Took the boat on the river today and ran 12 gallons of fuel and 2 cans of Seafoam thru the motor. Motor ran pretty darn well. Drop tested all 4 cylinders and they all passed. :D

Motor still doesn't seem to be reaching max RPM. I can't be sure though cause I don't have a tach installed....yet. My son and I got her up to 32mph today. A month ago, I maxed at 33 with just me aboard

I can't find any numbers on my current prop, so I'm not sure if it's the stock prop or not. Gonna throw on the spare prop tomorrow (10 1/4 X 10) to see if it makes any diff. It might be the same as my current prop, but it couldn't hurt to give it a try.

If I'm at WOT, I mist my carbs with premix and RPMs do go any higher(and/or it bogs), does that mean it prob getting max amount of fuel it's supposed to?

I did the link and sync per the manual, but there's always the chance I've screwed something up. I just want to make sure that I know the fuel/ignition thing is correct before I start looking at the prop.

Video from today
http://www.youtube.com/watch?v=5hWc0MO6jqY
http://www.youtube.com/watch?v=3MH3DUqCd3c
 

Tim Frank

Vice Admiral
Joined
Jul 29, 2008
Messages
5,351
Re: 1967 Johnson 80hp backfires when I mist fuel into carb

If I'm at WOT, I mist my carbs with premix and RPMs do go any higher(and/or it bogs), does that mean it prob getting max amount of fuel it's supposed to?

:confused: Typo maybe?
 

BonairII

Commander
Joined
Jun 7, 2011
Messages
2,727
Re: 1967 Johnson 80hp backfires when I mist fuel into carb

yep...typo. Meant if "RPMs do NOT go any higher"
 
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