Why did Honda change the sparkplug heat range in 1978 for the Express?

hondaplug.jpg

Re: Why did Honda change the sparkplug heat range in 1978 for the Express?

Prolly changed head design, and needed a hotter plug.

FYI the ‘p’ in bp5hs stands for protruding tip. Gets the spark deeper in the mix. Don’t ever get one mixed up on a moped not designed for the long tip, like puch. You’ll poke a hole thru your piston.

Re: Why did Honda change the sparkplug heat range in 1978 for the Express?

Terbo Speghetti /

> Seth B Wrote:

> -------------------------------------------------------

> Prolly changed head design, and needed a hotter plug.

>

> FYI the ‘p’ in bp5hs stands for protruding tip. Gets the spark deeper in

> the mix. Don’t ever get one mixed up on a moped not designed for the

> long tip, like puch. You’ll poke a hole thru your piston.

Done this. Didn't poke a hole, but I couldn't figure out why the bike never started. It was just close enough for the piston to close the plug's gap every time you'd try to start it. Take it out, it still made a spark, but in the bike it would get smooshed by the piston

Re: Why did Honda change the sparkplug heat range in 1978 for the Express?

Overpriced Parts /

> Seth B Wrote:

> -------------------------------------------------------

> Prolly changed head design, and needed a hotter plug.

>

> FYI the ‘p’ in bp5hs stands for protruding tip. Gets the spark deeper in

> the mix. Don’t ever get one mixed up on a moped not designed for the

> long tip, like puch. You’ll poke a hole thru your piston.

I don’t know what you’re talking about, protruding tip plug works and don’t hit nothin in every stock e50-za50 cylinder if stock head(edited)

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