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What are these plugs telling me?… and other questions!

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Oddjob:
Maybe number 3 wasn't fully wound in?

Craizeehair:

--- Quote from: Oddjob on August 29, 2023, 10:29:08 PM ---Maybe number 3 wasn't fully wound in?

--- End quote ---
I’m sure it was, they all needed loosening to get them out, when I put the new ones in the original socket just wouldn’t get anywhere the spark plug, it was just too thick / wide to go into the cavity. Really strange, I even got a friend to check as I thought I was being really dumb?

In all honesty, I freaked out a bit and thought I must have done some damage somehow when removing it but the old Honda socket worked perfectly, I just don’t understand how I managed to use it to take it out?

I managed to get the phone and take a picture as I was convinced I’d done something wrong and buggered it!

Craizeehair:
Double post

McCabe-Thiele (Ted):
I am paranoid about crossing a thread on alloy cylinder heads so to start them off I try to fit them in a few turns by hand.

When access is more difficult like on bikes I have a short bit of rubber tubing that fits easily on the plug insulation.
I am then able to dangle the plug into position and rotate the plug with the rubber tubing sounds a lot of fiddling but it works easily.
I then nip it up the last few threads with my plug spanner proper.

PS: Could it be that the new plugs have a slightly different height section to the previous ones so that the hex head is slightly raised from the boss even though the steel section is overall the same height?

Trigger:
On a Cb750 it is very easy to cross thread the plus on number 2&3. I away have an old straight plug cap, pop the new plug in it and turn it in a couple of threads with the cap on before using a socket to tighten up  ;)

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