What spark plugs work best ?

[Roberthill]

Have a 2000 90 hp Johnson .Model J90VLSSS whats the best plugs for this engine ? At present am using Champion QL78YC .This is used in hot climate(Texas)

 

[Grub54891]

Whatever the mfg suggests.

 

[boobie]

You've got the right plug and climate doesn't make a difference.

 

[60sboater]

Some insist NGKs are better. IDK,you could try both and see.

 

[Sea Rider]

Although my engine is a Jap brand using NGK Jap plugs and Champion ones as alternatives, don't see any performance difference between brands provided that both are well gapped tight to specs. Heat thermal range and electrode type is what counts, not brand.

Happy Boating