Re: McCulloch outboard
Alpo your model number is 64304530.<br /> I dont have the year in print but following number sequence it should be a 64. Fuel ratio is 40:1. 3oz. per us gallon. And for some reason 19 oz.per 6 gallons.<br /> I have an old set of manuals and service aids.<br /> One refers to the 40 hp.(the 61 version of your motor)Concerns about burned pistons.and a number of reccomendations.<br />1.cooler plugs J4J (J4C)gaped at .035.<br />2 1961 Quote"gasolines used with Scott engines<br /> must have a minimum rating of 90 octane.<br />3.Timing changed maximum spark advance from 34degrees btc to 31degrees btc.points set at<br />.020.<br />4.Prop.selection: Should be propped for 5,000 rpm full throttle normal load.If load often varies<br /> Should be propped for 5,200rpm one person load.<br /> 5.Be aware of lean burn conditions,carb adjusted too lean weak fuel pump,kinked or restricted fuel<br />lines.<br /> Many of these things were probably allready done on your 64 motor but it pays to be aware of any<br /> errors made over the years.<br />If your plugs are cooler than J4C leave it there.<br /> Hope I havent scared you.
