SOHC.co.uk Forums > CB750
What are these plugs telling me?… and other questions!
Pauarc:
Great tip with the old plug cap👏👍
Spitfire:
Everytime I change the plugs on mine I am extra carefully of the two inner plugs, I tend to use the Ted method with some rubber tubing but an old straight plug cap sounds really good as well. Sods law also says that it will be one of those that soots up, though Denso plugs solved that one for me ages ago thanks to Hondaman over on the US site.
Cheers
Dennis
Trigger:
Anything is better than dropping the plug in and putting a socket on ;) I had to make up some tooling years ago to tap number 2&3, as it was always the engine out to do a thread repair .
Skoti:
--- Quote from: Craizeehair on August 29, 2023, 10:41:37 PM ---
--- 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!
--- End quote ---
Aye,
same here, I can take the all plugs out with a 3/8" drive plug socket, but need to use the Honda tool kit plug socket to put cylinder 2 and 3 plugs back in.
I've got a bit of 10mm hex bar attached loosely to the top of the Honda socket so I can use a 10mm spanner to nip the plugs up.
I also use the rubber pipe trick Ted mentions, I believe it's called a "plug runner" in the trade.
Oddjob:
Pity the picture didn't show both plugs out as Number 3 looks to be a little worse for wear on the seat. If both were the same it would mean they were machined like that but if the other is pristine then maybe it wasn't tight and that corrosion is the result.
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