? on plugs for a 350cc Yamato (RB4)

[Lights]

I posted this in the General Hydroplane & Runabout Discussion board to.

I'm finished rebuilding my Yamato 350cc alky (RB4) and need to know which plug to run in it. The manual gave me three choices. They are NGK B-10HN, NKG B-10HV or Champion L-87R. Which one of these plugs or there replacement can I still get. Or is there a better choice of plug?

Thanks,
Lights

[Lights]

Anyone

[G Stillwill]

Lights I cross ref the B10HV and it gave these numbers

Denso W31FSZU
Splifire SF409B
Autolite 411

the L87R crosses to

Denso Iridium IWF27
Denso W27FN

[Lights]

Thanks G StillWill for cross ref. them for me. I'll give some of them a try.

[David Weaver]

Ngk

NGK BV11EG maybe....I may not have the right number exactly, but this is the successor plug to the BV10. It probably runs a little hotter and has an extended electrode.

[pro350hydro]

NGK BV11EG maybe....I may not have the right number exactly, but this is the successor plug to the BV10. It probably runs a little hotter and has an extended electrode.

Actually, in NGK the 11 should be a cooler heat range plug than the 10. Did you know they also make a 10.5???