Due to age , id start by seeing if it has any spark in plug , remove plug wire and insert 1/4 bolt , arrange near by a metal bolt or other item (not handle ) and do not hold bolt near item
turn ign switch on (don't bother with choke) and pull engine over several times , observe 1/4 bolt for blue sparks (dim lights if necessary )
no spark present , trouble shoot ign system farther
spark present - remove and clean plug with good solvent
add a little bit of engine start fluid to plug hole and reinstall plug and wire , attempt to start engine , nothing - compession problem or shorted plug if it sputters but doesn't start then its a carb problem , troubleshoot carb (clean it )
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I've checked spark with plug out new plug I've rebuilt and cleaned the carb changed the air and gas filters and gas line the only thing I haven't done checked the choke start switch and cleaned off the coil thank for the answers
replacing the spark plug is good start but wont help with a no start if you have ign ckt problems the method i outlined shows u how to detrmine this
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