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changing spark plugs in 18 axis t23 with crusader 409 engine


Bluelake

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i think its more about not letting them “freeze” up in the holes.  i replaced mine recently (using gap straight out of box by the way which was same as what came out .060 where indmar manual states .040-045).  i did not need them after 550 hours, boat ran fine and i bet it could have gone 1000++ hours

my dealer was ripping me off doing plugs and wires every 100 hours/annually

i just did mine for reasons above at 750 after two unnecessary replacements at 100 and 200 hours 

thinking i might do them again at 1500, now at 950, but that probably not necessary now with covid thats only 1.75-2 more years after doing them this spring. probably go to 1750 -1850 which will be 2.75-3 years from this last spring, so probably unnecessary even then fir performance reasons

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I would have to agree with replacing them every two years or 300 hours.  Performance issues are not really the reason as much as protection of the exhaust catalyst.  Misfires and unburned fuel can be really hard on the cats.

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