Good Spark Plugs to Buy?

Hello, What plugs are the best to use in 77 KZ650? Are Hotter plugs good to use?I live on the Oregon coast avg. temp summer is 65deg. Winter is 38deg. Always seems have moisture in the air and lots of wind

Unless you are experiencing a problem, it's generally best to stick with the factory recommended heat range. Regular NGK plugs are high quality and reasonably priced. Again, unless you have a special need, esoteric plugs (platinum, iridum, silver, et cetera) are mostly a waste of $$$$$.

A better question might be, what is the best oil and chain lube? :lol: :silly:

Stock sparkplugs in the bigger older 4's is NGK B8ES or Denso W24-ESU's gapped 0.028 to 0.032 diameter.

Other brands like Accell,Bosch and maybe Autolite can be used. I'd stay away from Champion sparkplugs(bad personal experiance).

Put a dab of the silver anti-seize on a few threads to insure easy removal in the future.Avoid removing a hot sparkplug if possible to lessen the chance of thread damage.

Never had a single problem with NGKs. I use nothing else.

Thank you

I've been using Nippondenso ND W22ES-U plugs in my KZ650C1 and it seems to like them. Ed

ive always had good luck with b8s,but if its that cold out you might experiment with differant heat ranges to see if it helps any

The twins use the really hot plugs which is the B6ES or the W20ESU. The fours usually run the colder B8ES or the W24ESU because they get a lot hotter especially the inner cylinders. I know some people run the slightly colder B7ES in their twins for highway running to keep it cooler compared to the stock B6ES.