SOHC.co.uk Forums > CB500/550

Correct spark plugs for my 500 ?

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K2-K6:

--- Quote from: AshimotoK0 on November 13, 2023, 11:43:46 PM ---
--- Quote from: Nurse Julie on November 13, 2023, 02:45:14 PM ---Denso X22ES-U is the correct type.

--- End quote ---

Going to go with these Julie as heard there are a lot of fake NGK's around. Do you have a reference for ND for CB750K0 and 400/4 please?

--- End quote ---

Original std for 750 K0 listed as D8 ES in Honda workshop manual, no equivalent for ND. Later manual lists D8 EA with ND "X24ES-U" as direct alternative. 

Nurse Julie:

--- Quote from: AshimotoK0 on November 13, 2023, 11:43:46 PM ---
--- Quote from: Nurse Julie on November 13, 2023, 02:45:14 PM ---Denso X22ES-U is the correct type.

--- End quote ---

Going to go with these Julie as heard there are a lot of fake NGK's around. Do you have a reference for ND for CB750K0 and 400/4 please?

--- End quote ---
X24ES-U Ash.

K2-K6:

--- Quote from: deltarider on November 14, 2023, 08:07:06 AM ---
--- Quote from: davidcumbria on November 14, 2023, 07:08:14 AM ---[...] Run iridium in most of my bikes which definitely help starting but can’t see one for the 550.

--- End quote ---
Any new sparkplugs will help starting. Some in the German forum have tested iridium plugs but were not impressed. These plugs will do well in modern bikes however which run much leaner than our filthy beasts.

--- End quote ---
It's primarily about service life and gap change during that lifing to meet intervals in schedule as opposed to significant changes in performance of the plug.
Before these materials they were heading toward twin and triple earth type plugs for durability (typically toward 36,000 miles in car engines) ultimately superseeded by this type of plug with more resistant materials.

Bryanj:
Many years ago our NGK rep was  gent called Stan Dibden who used to be a sidecar racer, just by looking at the plugs from a GT 250 he advised stripping as a piston was holing and he was right.
He also gave me a set of D7EV for my 500 and i found it started cleaner, ran better and gave better mpg.
That plug has been long discontinued and if you can find them its £8-10 EACH, i am lucky to have bought a few sets years ago

Skoti:
Aye,

Stan Dibben former sidecar world champion, NGK spark plug rep and recent vice president of the Norton owners club.


Here's a clip from the New York Times  https://youtu.be/V_8vr_4qa2g (7mins)

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