Help getting my 67 Evinrude 3hp started

This topic has 84 replies, 12 voices, and was last updated 4 years, 1 month ago by reivertom.

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February 26, 2020 at 4:23 pm #195921
Elecmuso
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https://youtu.be/aTL7S8ePEEk
- This reply was modified 4 years, 1 month ago by Elecmuso.
February 27, 2020 at 7:39 am #195944
Elecmuso
Participant
Well I’ve done that now (cleaned out the fuel tank) and still no start. So there is nothing blocking fuel precarby.
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I also cleaned out the carby with carburettor cleaner and reassembled – no I didn’t have a carby kit.
As per this page: https://outboard-boat-motor-repair.com/Evinrude%203%20HP%20Lightwin%20Outboard%20Boat%20Motor/Evinrude%20Johnson%203%20HP%201952-1967%20Carburetor%20Tune-UP.htm

When the fuel is turned on, should fuel rush into the carby? Doesn’t seem to happen this way for me which makes me wonder if somehow the carby still has a blockage (I know the tank is clean and the tap/valve is not blocked)?

Checked sparks and have them on both plugs.Could the order of the plugs be out? What is the best way to be sure each lead is on correct plug? Could the spark be of inadequate strength and will one of these tell me if it is so? https://www.ebay.com.au/itm/Car-Tool-AZ-Ignition-Diagnostic-Adjustable-Spark-Plug-Tester-Wire-Circuit-Coil/283667078200?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D20160908110712%26meid%3D24864db496fe47bfb2063e807026e3b6%26pid%3D100677%26rk%3D3%26rkt%3D30%26mehot%3Dnone%26sd%3D362706144982%26itm%3D283667078200%26pmt%3D1%26noa%3D0%26pg%3D2386202%26algv%3DSimplAMLv5PairwiseWeb&_trksid=p2386202.c100677.m4598
- This reply was modified 4 years, 1 month ago by Elecmuso.
February 27, 2020 at 8:06 am #195946
crosbyman
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Canada Member - 2 Years
did you do a blow test on the carb ??

is fuel delivered to the carb if you disconnect the feed at the carb inlet ?

is the choke plate working ?

do you feel suction on the carb face if you put your hand n front of it while you pull the start cord ?

try a tea spoon of gas in each cyl ,,,,install the plugs and try to start…does it at least sputter a bit ??

Joining AOMCI has priviledges 🙂
February 27, 2020 at 9:35 am #195950
lindy46
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US Member - 1 Year (includes $3 online payment fee)
With the fuel line disconnected from the carb, there should be a good flow (not gushing) when the valve is open. It doesn’t take a lot of fuel to run these little motors. With the carb empty, if you blow in the fuel intake, air should pass through. If not, there is a blockage or float is stuck closing the valve. I usually test before re-installing. Right side up, air should pass. Upside down, no air should pass.

The front-most coil feeds the top cylinder.
- This reply was modified 4 years, 1 month ago by lindy46.
February 27, 2020 at 11:31 am #195964
fleetwin
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US Member - 2 Years
Remove the lower hex drain plug from the carb and open the fuel valve….Flow should flow out of the carb if the lines/valve/inlet needle seat are OK… Did you inspect/clean the carb fixed high speed jet?
February 27, 2020 at 4:43 pm #195996
Elecmuso
Participant
Thanks everyone.
Removing hose from carb and there is no fuel flowing out of the carb.
When I do the blow test no air gets in.
The lower hex train plug – you mean part 34 in the carburetor parts diagram here
https://outboard-boat-motor-repair.com/Evinrude%203%20HP%20Lightwin%20Outboard%20Boat%20Motor/Evinrude%20Johnson%203%20HP%201952-1954%20Parts%20Manual.htm
Upon close inspection it appears that this has been snapped off at some point!
February 27, 2020 at 4:43 pm #195999
Elecmuso
Participant
Thanks everyone.
Removing hose from carb and there is no fuel flowing out of the carb.
When I do the blow test no air gets in.
The lower hex train plug – you mean part 34 in the carburetor parts diagram here
https://outboard-boat-motor-repair.com/Evinrude%203%20HP%20Lightwin%20Outboard%20Boat%20Motor/Evinrude%20Johnson%203%20HP%201952-1954%20Parts%20Manual.htm
Upon close inspection it appears that this has been snapped off at some point!
February 27, 2020 at 4:47 pm #196002
Elecmuso
Participant
So looks like I have a blockage still.
February 27, 2020 at 5:33 pm #196007
Elecmuso
Participant
Th blockage was inside the carb. As far as I can tell the float is not ‘adjusted to level’ properly. it seems that although the needle valve works with the bowl off (tested by blowing in the inlet with the bowl off and lifting the float up and down) it is not horizontal which means putting the bowl on permanently closes the valve.
February 27, 2020 at 5:35 pm #196008
fleetwin
Participant
US Member - 2 Years
No, not #34 in your drawing….The big 7/16″ hex plug right in front of the carb….Remove that plug, fuel should flow from the carb with the fuel valve and air vent open….
You could always perform one more test to be sure there are no ignition problems…..Simply remove the spark plugs, squirt some gas/oil mix into both cylinder, then crank the engine over….The engine should fire briefly if ignition is OK and lack of fuel is an issue….
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