Topic: NGK BP7ES?

[5bassman]

I read here on the forum that the NGK BP7ES is more for racer bikes. Mine look like they are running rich with the black sooty carbon on them. If I install the NGK BP5ES will this help it run a little leaner? I'm getting conflicting answers in my searches. I plan on doing a tune-up and carb rebuild this winter. This is on a 1975 CB550F SS. Thanks!

[bistromath]

If your carbs are tuned properly then the stock plugs are best. Tune your carbs, not your plugs, and start with stock everything.

[Dennis]

I read here on the forum that the NGK BP7ES is more for racer bikes. Mine look like they are running rich with the black sooty carbon on them. If I install the NGK BP5ES will this help it run a little leaner? .... This is on a 1975 CB550F SS.

Do not run "BP" plugs on these bikes, they are a projected tip design of spark plug intended for a different application. Check your owners or service manual for the correct plug for your model, I "THINK" it is B7ES. B5 is significantly hotter, I wouldn't use it.
A hotter plug will not make a mixture leaner, only the proper repair or adjustment will do that. Changing the spark plug type cannot change a mixture.
Don't look for short cuts, you will only create other problems for yourself later. Learn to diagnose and correctly repair your bike. There are many people here willing to help you.

[Einyodeler]

You need NGK D7EA or ND X22 ES sparkplugs

[Dennis]

D plugs, B plugs, damn ...
I must have just lost it last night, thinking of my RD or something.

Thanks for correcting that error, Einyodeler