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Please help with 2 stroke 4 hp identification

achilles24

New member
Hi,
I don't have serial number (where to find?) or model number plate (I have on my other 3.3 Mercury). By browsing catalogue, those parts are diagrams fit:
http://www.marineengine.com/parts/m...0p400999-bel/cylinder-block-crankshaft-piston
http://www.marineengine.com/parts/m...-9589153-bel/cylinder-block-crankshaft-piston

I bought engine bit in a rush (not the best decision I know). Now need to buy impeller - will this fit? http://www.marineengine.com/newparts/part_details.php?pnum=MER47-16154++3

Bonus question - I don't have fuel filter - should I install one? Also, would love to learn more about spark plugs in small (3-5 hp) 2 strokes - do you have a good read?

Thank you

And photos:

 
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