Re: what is the correct fuel/oil mix for evinrude 4hp ?
The proper mix is 50 to 1 or 16 oz to every 6 gallons,in my little boat I put 4 quarts in the 48 gal tank and its been running for 22 years,your running way to rich and your plug is probaly fouled,take it out clean it up/dump your fuel and mix it right,thats a great motor you got,I hunted with it for years,oh yeah when you get started run it till all the smoke is gone or you will have carb problems ,if you dont have them all ready,a little carb cleaner wont hurt but get it running first,or all that trash will foul you out,have a great trip bartriley1
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91 octane rating ( no e-mix fuels ) and proper outboard oil ( not normal engine oil)
outboard oil has a property that allows the oil residue to stick to the metal bits and helps prevent rust
e-mix fuels absorb moisture and and rusts out steel tanks , destroys rubber components and corrodes aluminium components
the model you have is not listed on any 7.5 hp engine from 1950 to 1958
model number starts at 4434 to 7512 to 7525 in 1958
for a better answer , talk with an evinrude service center who should have a chart listing your motor
units with oil injection are 50: 1 ratio and others are 6 gallons to 1 pint of oil which is around 45:1
I would seek advice from an evinrude service center for the correct fuel to oil ratio for your engine
to mix the fuel , put the oil in first then the flow from the bowser will effectively mix it up to start with
then fit the cap on the tank and shake it up yourself
The correct mixture is 50:1, or 1 pint per 6 gallon tank. Use quality brand-name outboard TCW-II or better oil(Bombardier or Mercury eg.) to eliminate the oil as a problem.
Check your plugs for fouling. If using perma-gap / surface-gap type plugs, switch to the L77JC4 type, especially for long idling or slow speed operation. For extended high speed operation, the surface gap plugs are recommended.
Open the fuel valve ( at the back near the spark plugs).
Pull the choke knob ( SB side at the lower front of the motor)
Set the throttle handle in 'start' position ( abour 1/4 of the travelling way from SB to Port)
Pull the rope starter.
Should start easily.