New boat owner-fuel requirements!

[fxpthl]

I own a 1970 Evinrude Sportster 25 HP. Since no-lead gas is the only regular fuel available, what, if any, additives should I consider for this 2 cycle motor? The lead of course was an anti-knock compound and I am afraid of using the wrong fuel mixture and damaging an already older engine!

 

[12Footer]

Re: New boat owner-fuel requirements!

The important fuel requirement is NO ALCHOHOL. It has the nasty ability to eat rubber,IE, fuel pump diaphram,fuel line linings, float valve seats ect.<br />Use a good medium grade (>87 octane) first tank,and bring a can of "Sta-Bil" or "SeaFoam" on the trip.Listen to the engine.If it "Pings" or sounds like you are getting pre-ignition,shut it down,add the recommended dosage of additive, and use-up the fuel. Next trip,go up to a premium,no alchy gas. You wont need the additives.<br /><br /><br />------------------<br />Time to change my tagline

 

[12Footer]

Re: New boat owner-fuel requirements!

PS:<br /> No need for the lead substitutes, as they just add to the carbon problems.<br /><br /><br />------------------<br />Time to change my tagline

 

[JB]

Re: New boat owner-fuel requirements!

Yo, fxpthl. Back in those days we often sought out "Amoco white" gas for our outboards because it had no lead or other additives in it. It burned a lot cleaner than leaded and, at 85 octane <br />never caused any pinging in a properly tuned engine that wasn't carboned up. Bottom line? Unless you have a lot of carbon in the combustion chambers 86-87 octane unleaded will do fine. Follow 12footer's advice about the Seafoam. If you have a lot of carbon that will clean it out.<br /><br />Be sure to avoid gas with alcohol in it and use only the best (OMC, Merc, Yamaha, etc.)oil.<br /><br />Good luck<br />JB