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    Eng. Not getting the right R.P.M.'s

    I have a 1966,Merc 650 (65 hp) S/N 1897689 motor, with a 14in. 15Deg. prop on it at the moment.<br />Installed my new Tiny Tach. and went WoT for 3850 rpm's. manual say's i should be more around 5200 rpm's. Could it be i need a smaller Deg. prop.? or maybe i should check compression of my...
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    Tiny Tach. couldn't help now what?

    ok, called TT about getting a tach. for this motor. (merc650, 65hp s/n 1897689)<br />but, i was told by them that my type of motor has a mag. and they could not help me with a tach. (/bangs head against wall)now what? surley mercury came out with a tach. for this type of eng? <br />would a...
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    three blade or four?, aluminum or steel ?

    I am about to buy a new prop. need some input please..<br />I have a 1966 (65hp) merc 650. The existing prop is a three bladed aluminum 14in. 15deg.<br />I heard that a steel, four bladed prop, would be much better?<br />Any suggestions? thanks<br />Ty.
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    want to add a tachometer to my boat

    i have a 1966, merc 650 (65hp) [s/n 1897689].<br />the thing about this eng. is that it seems to have a magneto rather than an alternator. at least that's what it looks like to me.<br />(like small aircraft have)<br />anyone have an idea what type of tach. i can use with this eng. and tips on...
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    2 stroke or 4 stroke how can ya tell what you got?

    I know this should be obvious but, me and a friend bought a boat.<br />The boat has a 1965 or 66 mercury outboard motor (65 hp). now i see four (4) spark plugs in four (4) cyl's. So i believe it's a 4 stroke eng.<br />my friend say's " well, it has to be a 2 stroke cause we mix the gas and oil"...
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